Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Modified Ported Work or Race saws => Topic started by: HolmenTree on December 29, 2016, 11:19:41 pm

Title: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 29, 2016, 11:19:41 pm
Well here we go. :)
I pulled my old relic from out of the attic, a 1982 Yamaha YZ125J bike saw I built 33 years in my garden shed when I was a young 25 year old timber faller.

Thanks to inspiration from saw restorer Ken Steeves  I've decided it's time to completely redesign and rebuild the old YZ125. Which as a matter of fact put out more horse power then all the other factory 125's during that era. Only trouble was ...left hand drive.
As I go through this rebuild project thread I'll show pics and explain how I originally built it right hand drive through inspiration from former Hot saw legend Gary Walrath with his Yamaha 292 Thunder Jet snowmobile engine saw . But our saws were different.... the chain turned backwards.   :o
Threw rooster tail chips like crazy on the down cuts and pulled in nice on the up cuts. But was a handful to hang onto ;D
I rebuilt it to left hand drive and worked well for me over the years with our central region 10"×10"- 12"×12" three cuts all down modified events.

But since retiring from competing for 25 years and since only sponsoring and running my own little yearly saw cutting competitions. I want to take one last stab at it and for fun get out the Hytest axes, Mercier bow saw and crosscut along with the YZ and maybe a quick little 272XP.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 12:39:34 am
Now you're probably wondering why I didn't build a 250 moto cross engine saw.
Well way back in 1983 my intention was to compete exclusively in the Canadian PNW.  Canlog rules out there maintained 140cc maximum displacement for hot saw.
So I went 125 ...with over 30 horsepower factory they were competition for the Kart saws.

So here I am wanting to redesign my Yamaha 125 with massive weight reduction and compactness. Already the powerhead only weighs 32 lbs with lots of room to get it into the 20's.
So with my plans to go right hand drive I had several decisions....rotate cylinder and piston and ignition then run engine backwards, or....rotate crank and ignition, or....Lay engine on back with carb up to right hand drive and run engine rotation backwards with ignition reversed 180 degree .

Well I concluded after pulling the rewind housing and the starter cup off the rotor. Why not run the drive sprocket off the rotor.
From looking at the Jack Stewart/Sven Johnson 250 CanAm Rotax bike saw rebuild that Ken Steeves did...the drive sprocket was driving off a single long shaft held to the crank with 8 small screws.
 This shaft held the ignition, clutch, rim sprocket  and rewind starter. And that powerfull saw won Hayward, Wisconsin 7 years in a row. 8) Best time 8.03 seconds in 3 cuts of 20" pine with cold start.

So as my pics show with the starter cup removed what I'll  do is re-thread the rotor puller threads in the rotor to left hand thread.
Build a 2 piece shaft with both pieces left hand thread. The piece threaded into the rotor will be locked with a internal nut on the crank. Supported by a sealed bearing and seal in a aluminum side cover sealing the ignition. The 2nd piece external shaft will left hand thread into the base shaft with a standard 7 spline welded to it, holding the 11-13 tooth Danzco rim sprocket. With a washer and C clip on the end. Different size rims can be easily swapped for different wood.
B/C will still be very close to crankcase centerline.

A new aluminium rewind rope spool will be mounted on the left side crank end replacing the old 11 tooth spur sprocket.
Left hand rewind rope position will be a natural fit for a quick cold start as the saw is lifted and started at the same time.



Title: Re: HolmenTree Bikesaw Resurrection
Post by: adam32 on December 30, 2016, 10:36:28 am
Ken Steeves did an awesome job on the Rotax! I sold that saw to him. Great guy too!

I'll be watching this thread, should be really cool!!!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 10:58:41 am
Thanks Adam.
 Yes I meant to mention you owned that "original Rotax hotsaw" . Very cool engine with the dual HR's on a rotary valve. With a little redesign that saw could still be competitive today.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: adam32 on December 30, 2016, 11:49:51 am
Thanks Adam.
 Yes I meant to mention you owned that "original Rotax hotsaw" . Very cool engine with the dual HR's on a rotary valve. With a little redesign that saw could still be competitive today.

I agree.

 I thought it was 330cc? I never measured it though.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: aclarke on December 30, 2016, 05:44:39 pm
Super cool, really like the lightweight bar!
How does the big tillotson (HR/HD?) work?

Adam
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 10:19:18 pm
Super cool, really like the lightweight bar!
How does the big tillotson (HR/HD?) work?

Adam
Big Tillotson HD 42 mm works really good Adam. It's got H and L screws which makes it super easy to tune. Very reliable carb, there's a return line that cycles unused fuel back to the fuel tank.
I had a smaller 34mm HR on it when I originally built the saw with the engine laying horizontal with the chain cutting backwards on right hand drive.

Here's some pics of the original setup. Plus some pics of Gary Walrath's world record time setter 292 Yamaha Thunder Jet hotsaw back in 1984 in Estacada, Oregon. Also cuts backwards while throwing wood chip rooster tails 70 feet.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: sharkey on December 30, 2016, 10:23:55 pm
Really cool project!  I kike that Newspaper clipping too. 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 10:43:48 pm
Really cool project!  I kike that Newspaper clipping too. 
I remember that event like it was yesterday.  Thompson Manitoba Winter Festival. We qualified outdoors Saturday the day before when it was around 40 below .
Sunday afternoon we did the finals inside a hockey rink with 2000 people jammed to the rafters cheering us on. Rick McIvor ran a 600 Polaris Indy snowmobile engine saw with triple tune pipes..
 We made lots of noise in there lol.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 10:52:34 pm
I made some noise with my ole 090 before the YZ. Had it setup on alcohol with a nice 34mm Mikuni alky kart carb. Direct drive with no clutch, fan wheel and oil tank.

090 couldn't beat my older brother Dennis's Mac 101 kart saw though. The Mac also ran a 34mm but on gas.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 30, 2016, 11:04:32 pm
I'll talk to you guys in a couple of weeks. First thing tomorrow morning my family and I are flying out to soak up some sunshine with lots of heat.
Have a Happy New Year everyone!!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on December 31, 2016, 05:44:00 am
Wonderful craftsmanship Holmen, impressive. How did you cut these aluminum sheet below? with plasma air cutter?
 
(http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=6238.0;attach=19776;image)

Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 31, 2016, 08:25:57 am
Chy, no plasma cutter :D
I just used a hand powered key hole saw. The cuts are pretty rough, but what is covered up you don't see anyway.
Everything was basically made by hand with very few power tools. I had a good machinist hired to build the "high tech" parts though. ;D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 31, 2016, 09:16:32 am
Another pic from 1988. Notice how I insulated my tune pipe for better performance in our cold weather.
Happy New Year everyone!!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 31, 2016, 04:26:31 pm
One more plane ride tomorrow morning and we're in the tropics.
I have to correct my last post regarding the newspaper article, it was 1991 not 1988 after I just did the math, as I was then 33 years old.
That was the year I retired from competing. I was in my prime but decided to actually organize, run and sponsor competitions for the next 25 years.
For a few summers I did chainsaw carving exhibitions for municipal events that sponsored me.
 Even organized, coached and travelled with a competitive timbersport team, comprised of a strong team of aboriginal king trappers.

Was a good gig. :)

Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on December 31, 2016, 08:03:41 pm
Can you still hear reasonably well today
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 31, 2016, 08:28:45 pm
Can you still hear reasonably well today
Yep really good lately Pete. ;D
 I did some tree removal for an audiologist this fall . We traded some tree work for a new hearing aid for my left ear. I should have had one years ago . Real life changer.

Saws never hurt my hearing as I've always wore plugs or muffs since day one.
It was determined I lost hearing in my left ear when I was a kid on the farm before I got into logging and saws.
As a kid I shot alot of rounds from a 12 gauge and big rifles. Plus many hours on the field operating  no cab 2 cylinder John Deere D and AR tractors, looking over my right shoulder at the cultivator.
Dad bought a R diesel just before I left for the bush at 16. Awesome JD tractor 8)
 Yeah I guess we never thought of hearing protection back then.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 04, 2017, 05:55:28 pm
We enjoyed our first Mexican sunset of the year last night. Daily highs in the mid 80s F. 8)
Was thinking about the bikesaw and hesitant about running the drive sprocket off the rotor even with a bearing supporting it.
Tapered shaft, small key and smaller diameter then the drive side crank stub.

Both main bearings are 52mm in the crankcase so thinking about flipping crank around, build a new mounting plate for the CDI rotated 180 degrees from its original position.
Now I could have right hand drive with the original strong crank stub and retain the 11 T spur with hub and build the 13 pin rim with a keyed hub too.
I know the 2 trigger coils supposably work at different rpms so repositioned 180 degrees and timing on the stator plate adjusted....everything should work as original.
Any thoughts?

Title: Re: HolmenTree Bikesaw Resurrection
Post by: adam32 on January 04, 2017, 08:00:38 pm

We enjoyed our first Mexican sunset of the year last night. Daily highs in the mid 80s F.

Any thoughts?


Don't drink the water...or eat from a taco stand after midnight...haha
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 04, 2017, 11:36:16 pm
A little tequila purifies anything :D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on January 05, 2017, 05:43:09 am
any thoughts   Yep just one  forget the saw enjoy the holiday you will be back to freezing before you know it
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 05, 2017, 01:02:18 pm
Hahaha....good advice Pete.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 05, 2017, 05:11:55 pm
Sitting on the beach here and found this pic on my phone.

This here bikesaw was the first one built in our region in 1982 which persuaded me to build my own.
Our local Husqvarna dealer Jim Hayes of  Hayes Forest Products from White Fox, Saskatchewan who sponsored and paid for the TV rights of our Weyerhaeuser Prince Albert Winter Festival chainsaw events.
He was getting tired of the 090's and Mac 101's taking all the fame away from the piped 2100's.

So he built this Husqvarna 430 cc bikesaw. An air cooled engine with the cylinder fins cut off.
This was unique for the redneck fabricators.......he built a 11 tooth sprocket for the saw by welding a 11 tooth sprocket removed from a bar nose sandwiched between 2 homemade washers. He then welded a keyed hub in its center to attach to the crankshaft.
I like how Jim left the empty transmission housing intact to attach the rear handle to.
Very quick saw for its time.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on January 07, 2017, 07:25:19 am
Interesting to know its carb is gravity fed Holmen, wish to see some more pics showing his homemade sprocket if you have some more.
Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 07, 2017, 12:46:25 pm
Interesting to know its carb is gravity fed Holmen, wish to see some more pics showing his homemade sprocket if you have some more.
Chy
Chy, I have no other pictures of the Husqvarna bikesaw.
But seeing this is a closed thread for members only I can share how to make this 3/8" 11 T rim sprocket .
What Jim did was he removed the sprocket from a bar nose, then sandwiched it between 2 grade 8 flat washers. I believe ( if my memory is correct after 35 years) washers were for a 1 1/4" bolt. After welding it all together on a lathe he cut the washers to exact spec for the diameter of the sprocket teeth. A keyed  hub was machined and welded in the  enter to fit the crankshaft stub.

Stihl sells a 13 Tooth 3/8" sprocket guide bar nose so that size is optional too. Along with 9 and 10T.

Many variations of attachment to the crank or clutch drum can be made. For instance you can weld the sprocket to a regular splined clutch drum with spacers between the sprocket and drum to match the bar groove.

I prefer this design of rim  sprocket over the Danzco "pin" style sprocket as the bar nose sprocket is a "true spur" sprocket.  Which fully supports the chain's drive link.
For a more durable sprocket 4 washers could be used with the nose sprocket sandwiched between 2 washers on each side. But the single washers worked fine on the 40 plus hp (at the rear wheel) Husqvarna bikesaw.

Ok Chainsaw Repair do I get a like or award for this info..... Hahahaha.  ;D

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on January 07, 2017, 05:33:39 pm
That was a new one for me. 

How about a 2 thumbs up.  ;)

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 07, 2017, 05:56:17 pm
Looks good to me!!
I'm honored, Hahahaha   :D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 08, 2017, 10:40:53 am
It's a good idea to balance these homemade rim sprockets.
A buddy of mine who lives down the road from me is the head aircraft mechanic for our local RCMP detachment.

In his shop he has a computerized dynamic balancer for the turbo prop planes he takes care of.
He says he can balance almost any machined part and is looking forward to my saw build.
I'll get lots of good information but I can't guarantee any pics, as his air craft hanger shop is a highly restricted area.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on January 10, 2017, 05:23:51 pm
Thank you Holmen, very informative to me! Either pay you two thumbs up.
Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 10, 2017, 06:26:38 pm
Quote from: chy_farm link=topic=6238.msg75423#msg75423 date6=1484087031
Thank you Holmen, very informative to me! Either pay you two thumbs up.
Chy
Your welcome Chy,
I have this  rim sprocket built with washers and a nose sprocket  in my plans for the Yamaha.
I ordered a 13T Stihl ES sprocket nose before I went on holidays to start my project.
I have no plans to use the 13 pin Danzco rim sprocket, the 11T spur I already have will be re-used .
11 T for 16" and over diameter competition wood . The 13 for 14" and under.
I have used the Danzco rims in the past milling lumber with my Stihl 090AV  and I wasn't happy with them for longevity.
Pins coming loose and rim plugging up with sawdust causing overheating. With a high horsepower motor like the Yamaha on a 3/8 chain the situation will be worse even though it's for short bursts in the cut.

Depending on my decision what side of the crankshaft I'll mount my starter rope pulley onto....I may just build the rope spool into the drive sprockets
.
But I'm thinking it's better to just keep it simple and have the rope spool on the left hand side crankshaft stub and leave the drive sprockets on the right by themselves.

In competition I always cold start the Yamaha as I'm picking it up....not starting it before I pick it up. Every split second counts. :)
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on January 13, 2017, 09:33:23 am
Very impressive Holmen, this know-how for drive train must be one of the cores of your super saw. Greatly appreciate your generosity to share this with us.
Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 21, 2017, 05:21:27 pm
Chy, yes drive sprocket gearing means alot for a 125cc and under motocross engine.
Project is on hold for a bit as I'm back reorganizing my workshop. I have to get that done and out of the way before I can settle in on the saw.
BTW I just turned 59 years old and holding today ;D
I feel just as good as I did back in my 30's .
Young wife and kids might have something to do with it :D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on January 25, 2017, 09:23:17 am
>Young wife and kids

Wow, how young she is? and your boys/girls are Holmen!
Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 25, 2017, 11:05:37 am
My wife is 44. Twin 10 year old girls and a 13 yr old girl.
3 other daughters in their 30's from a first marriage and a 24 yr old son.
Yep I'm busy ;D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on January 31, 2017, 03:40:50 am
Soon they will make you a good grandfather Holmen, lol.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 31, 2017, 07:27:48 am
Soon they will make you a good grandfather Holmen, lol.
Chy, I already have 7 grandkids. haha
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 10, 2017, 01:16:37 pm
Just an update here how things are going.

The other night I received some excellent advice from a highly experienced and knowledgeable saw builder.
Great advice on tune pipe and cylinder work, I thank you again Ed Heard.
Hopefully at the end of this project you will have time for me to hire your services to finish this saw.

This old Yamaha has alot of sentimental value to me, the main reason I want to keep it in the wood. It may never be the fastest saw at the show,  but I hope to make it the most user friendly and a consistent performer.

I'm busy at the moment getting my logger sports events ready coming up in a weeks time.
I dropped alot of events over the years but still have the 3 most poplar ones running.... the men's and women's stock speed cutting and the carving event.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on February 10, 2017, 02:17:08 pm
Might show that FB CR group a taste of this restore repair. ;)   

Sounds good.

That time of year again to freeze at  the stock race deal you manage?   The womens best time ever beat the mens best times?
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 10, 2017, 04:17:38 pm
It'll be a little warmer by next week only about 10F below or so. Haha.
Yes my oldest daughter about 15 years ago had a women's 1st place time that beat the men's 1st place time.

Here's a newspaper article from February  1989.  I won all 3 classes the year before,  winning 3 new saws for prizes. (Jonsereds 670, Husqvarna 268XP and a Stihl 034AVS).
But in this following year I messed up as the picture shows with a experimental long stinger pipe that didn't work out so good stalling the engine on the 2nd day.
Cold start, 3 cuts all down.

Last pic is the first ever modified Husqvarna 3120XP in the country. Peter Holmquist the man running it.... is "The Man" who brought Husqvarna to the B.C. PNW way back in the early 1970's. This guy originally from Saskatchewan  (farmed near my Dad's farm) made a fortune over the years after heading out west as a young man.
Roy M can tell a few stories about Peter.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on February 10, 2017, 09:52:01 pm
Very Cool Holmen.   I love all the pics and the newspaper article.    I feel like it is a real piece of history.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 12, 2017, 09:12:21 pm
Thanks 3000!
Here's another piece of history, in today's time.
I didn't even know about this local event from last July until last night. Ha ha!
They claim "Manitoba's first ever lumberjack championships". And I have lived right here in Manitoba most of all my life. I was vacationing with my family on the east coast last July so probably explains why I missed it.

But anyways I made claim 20 years ago having started and organized Manitoba's first ever lumberjack championships as the pic of my T shirt at the bottom shows!
Good round of hotsaws in this video.

https://youtu.be/jYuRcZvc7Po

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on February 13, 2017, 12:54:00 pm
Thought about your show temps when I read this.  :D

Canada Temps  :P

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 13, 2017, 01:32:21 pm
That is priceless ;D

The 2 tropical parts of Canada, the west and east coasters are dealing with ALOT of snow. Big blizzard out east with about 3 feet in the last 10 hours. West coast has had a big dump and still staying for a couple of weeks now and road traffic for the locals is unbearable :D :D

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on February 13, 2017, 01:59:38 pm
Watched video. Competed with Nancy and Lindsey at a few shows in KY OH

Raced with Jason Lentz and his dad Mel. OH KY WV   Lentz uses Dennis Cahoon motors =  DC Hotsaws

I tried that bowsaw racing. I had no technique. Plus I was using a ole Gille Levesque blade. It wasnt on par with the new blades today or 07-2010.

STS competitor Jamie Cogar Jr sold me the blade so I would have something to use.

Thanks for sharing this video. Nice!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 13, 2017, 05:33:59 pm
That 250 Honda that Cecil Starr ran in the video was built by EHP Ed Heard. Too bad he cut out.

Cecil has the same idea I had back in the day with that portable homemade stage built on the ground.
But when I dropped the axe events I went to the fold up trailer stage I run now. Alot less work and time setting up.
I ran JP Mercier bow blades. Really quick.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 21, 2017, 12:00:43 pm
Back in the shop from a busy logger sport weekend .
Gotta get some work done on the workbench before busy treework season starts up again.

The Yamaha hasn't run for about 10 years so presently replacing the rotted fuel and pulse lines. Overhauling  the carb and then get her running again begore I tear her down.

Got a brain wave to make it right hand drive. Stuck it in the vise upside down at about a 45 degree angle.
I'll rotate the stator plate and coils 180 degrees. Install a starter rope spool on either the rotor or sprocket.
With the engine now running in reverse rotation I have a right hand drive rotating sprocket.
I'll remove the handles. Put a new top handle between 2 new side plates. 090 rear handle mounted down under the carb. Carb flipped over with diaphrams on top for better fuel fliow feed. Intake manifold flipped so carb is level.
New pipe routed down and to rhe right . B/C and new bar pad a bit more level.
So what do you guys think?
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 22, 2017, 03:32:30 pm

That time of year again to freeze at  the stock race deal you manage?   The womens best time ever beat the mens best times?
Yep a woman beat the men's this year and she was the last competitor after 2.5 hours of cutting on the same chain and wood.
At the start of the men's the 550XP's were running brand new Husky .325 chains.  Sara Germain came up at the end and blew everyone away. Tall blond good looking school teacher in her late early 30's.
Turns out she was born and raised  in northern Manitoba and then taught school in a small first nations village in  the rain forest of coastal British Columbia. Lots of exposure to wood and saws.
You never know who comes up to my competition..lots of surprises. Never got a picture of her as the photographer never showed up for the prize presentations.

On going issue at our Trappers Festival as my logger events are drawing bigger crowds then what the trapper events are drawing. Bunch of old board members trying to keep the loggers events low profile. >:(

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 02, 2017, 03:28:03 pm
Just adding this tidbit from 1986 of Ron Hartill 7 time Hayward World Champion Lumberjack and 2 time winner of the Homelite Tournament of Kings.
In this Idaho competition  he's running a 135cc B-Bomb kart engine.
In B.C. Canada where he lives, 140cc is the hotsaw displacement limit.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 13, 2017, 06:36:34 pm
Just putting it out there that my hotsaw project is on hold for a bit. Will post more pics and its progress ASAP.
Just got back from London, U.K. and if anybody out there has never made a trip there, make sure to put it on your to do list.
You won't be disappointed, wonderful place. Even ran into some arborists working at the London zoo as my 3 daughters witnessed in the photo. Great bunch of guys!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on April 14, 2017, 09:36:07 am
Nicest pic Holmen, we can see cutey ladies here. My daughter used to learn at the Glasgow Art School, the year before the last she came home. She says it was a very nice place to walk around in London.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 19, 2017, 09:01:58 am
Nicest pic Holmen, we can see cutey ladies here. My daughter used to learn at the Glasgow Art School, the year before the last she came home. She says it was a very nice place to walk around in London.
Thanks Chy,  that's great your daughter went to school in the UK. I hope my daughters get the high grade marks to be able to do that.

My Yamaha YZ project is on the go again!
Winter is peeking at us up north here and I'll be spending lots of time in my workshop for the next 5 -6 months or so as I'm starting up a chainsaw Sharpening business.
Will be also selling chains, bars and sprockets.  No saw repair though.
But will refurbish bars and used chains which I have a ton of.
Hope to get a sawchain franchise but no rush as I have alot of new chain in rolls already.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 28, 2017, 08:02:39 pm
Hey figured out how to post pics here again. I got off that G Mail and back to e-mail where I can resize my pics again.
Here's one of my 1986 064's and my 1989 044AV 10mm.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on September 28, 2017, 08:45:50 pm
I'll take all of those pleeeeese.  :P

Nice on figuring out pics.   I just let FB resize for me now and then save to here too.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: chy_farm on September 30, 2017, 08:35:13 pm
Hey figured out how to post pics here again. I got off that G Mail and back to e-mail where I can resize my pics again.
Here's one of my 1986 064's and my 1989 044AV 10mm.
Good morning Holmen nice pics!

As far resizing of pics I mostly use Gimp, a software to give better view to the pics. It also gives 'sharpness' to our pics.
Chy
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on September 30, 2017, 09:05:04 pm
Willard posted this one in the CR group.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 01, 2017, 12:06:42 am
Willard posted this one in the CR group.


Yeah that reminds me to find a air filter and cover for that 70E . Needs a good going over but it's in near new condition.
I never used one before, heard they have lots of torque to handle a long bar.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Jaymo on November 28, 2017, 09:28:26 pm
You had me at Yamaha.
Nice saws.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 29, 2017, 10:53:14 am
You had me at Yamaha.
Nice saws.
Yeah without the bar/chain the Yamaha makes alot of second looks with people thinking what the heck is that. Hahaha
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 24, 2018, 12:42:51 pm
30 below outside and staying warm in my little workshop.
My wife and "I" have agreed now that I'm 60 (shes 46) I got  to sell off a bunch of saws before she's stuck with them Hahaha.
(Little does she know I'll probably out live her)
So as pictured here I got the YZ125 back on the bench for total redesign and rebuild with 10 lbs reduction and switch to right hand drive.
But as other pic shows I have a 090AV , Jonsereds 70E, Stihl BT45 drill and 1986 064 with 084 carb to get gone over and sold off.
Still another 12 saws in storage to also sell off.
All my Huskies are going 338XPT 346XP OE372XP brand new 1993 272XP brand new 550XP and a low hour 395XP .
Going to stick with only 1 Husky a T536 LiXP and 3 Stihls...MS261CM MS362CM and a MS462CM.  Then hopefully round off with a MS500i.
I'm working on replacing the T536 LiXP with a Stihl  top handle 160 battery saw that hopefully I can get shipped through HoneyBrothers out of the UK.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on January 24, 2018, 05:05:02 pm
Williard shoot me a price list just in case I can afford some of them.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 24, 2018, 07:29:20 pm
Williard shoot me a price list just in case I can afford some of them.
Sure will Kevin. I don't have a clue yet but will figure some prices out .
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 10, 2018, 09:13:55 pm
Got a good pic at the bottom.
Today I sold my 395XP with Alaskan mill and rails. Also sold my mint 272XP.
A local logging contractor bought them.
At his cottage over coffee he brings out his photo album from the good old days.
Him and I used to compete against each other in the hot saw events in the 1980's. He built a crazy Polaris Indy 650 snowmoblie engine hotsaw burning alcohol. Pushing over 100 h.p. Only trouble he couldn't win with it because he couldn't handle it , lol.

I took a few picks with my phone of his old  photos but he didn't have one clear one of his 650 Indy.
But got a good one of me running my YZ125.
This pic shows how we didn't take PPE seriously back then..... Hahaha
This is when I had it right hand drive with the chain turning in backwards rotation.
Pretty wicked push on the down cuts. If the wood was any bigger it would have pushed me right off the stage.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 11, 2018, 11:20:00 am
Wish I had a video of the wood chip rooster tails that YZ would shoot out.
In that pic we had to make 3 down cuts. The inertia from the backwards engine rotation was pulling the bar down while I was trying to pull it up. The first cookie just hit the deck and when I released the throttle going up for the second cut I accidentally  brought the saw up too high.
Worked really good in the down up down cuts. Sucked in real nice in the up cut.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 12, 2018, 08:11:50 pm
Well it took alot of figuring out but I finally got the YZ bike Saw converted to right hand drive.
What do you think? Hehehe.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: ray benson on February 12, 2018, 10:32:01 pm
Did you lighten the bar?
[attachimg=1]
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 12, 2018, 10:40:10 pm
Did you lighten the bar?
(Attachment Link)
Yes lightened and thinned. I had that short bar made by General Bar Co. Out of Tigard, Oregon back in 1984. The long one is a Cannon.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 16, 2018, 04:26:33 pm
On my tree service winter off season and back on my Yamaha YZ bikesaw rebuild.
Got her running in reverse rotation with the stator plate turned to the opposite end of the 2 slots. Haven't tried it in the wood but WOT sounds really good.
Just weighed it PHO with no pipe. 29.3 lbs. Little over 6 lbs heavier then a 3120XP PHO.
I got room to loose another 5 lbs on the Yamaha;)
Title: Re: HolmenTree Bikesaw Resurrection
Post by: jmester on November 16, 2018, 05:42:59 pm
Looking good
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 16, 2018, 09:02:05 pm
Looking good
Still have a long way to go yet . Lol.
So I'm rebuilding this saw back to the horizontal cylinder profile I originally built it 35 years ago.

Here's before and after.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 18, 2018, 02:00:39 am
 ???
Did you lighten the bar?

Here's a pic from 35 years ago when I cut 4 holes in that bar. The next day I was cutting 4 round aluminum plates and a couple tubes of JB Weld on hand to glue them in.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 21, 2018, 03:29:18 pm
No time for shop duty. I'm back chopping wood.
Pipe line contractor needs me to clear more trees along a major street.
Maybe by Xmas  I'll be free again.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 21, 2018, 04:15:55 pm
Thats a good thing IMO, =  $
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 25, 2018, 01:02:12 pm
Thats a good thing IMO, =  $
Turned out there wasn't the amount of cutting work as I was led to believe.
So now back in "shop hibernation". Lol.

I'm perched on my bench stool going over the bikesaw. And speaking of a shop I think now going back 36 years ago when I first started on this bikesaw build.
 I was in a 8x8 garden shed with a slabbed up plank work bench.
6 years later when I converted it to verticle cylinder left hand drive I did that in a bachelor apartment broom closet on a Black & Decker Workmate vise table. Lol.

Here we are in 2018 with a wealth of information on a smart phone.
Stihl .404 high tooth chain, top grade .404 harvester rim sprockets, vintage  sandcast factory works MX Nikosil cylinders that I can buy for my exact engine off Ebay.
Tillotson Ireland alky billet racing carbs.
Lots of other racing carb sources to choose from dragster kart to PWC.

Yup gonna have fun with this little project.
Then onto a 300+cc project....maybe..
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 25, 2018, 04:24:13 pm
Forgot you guys in the US are on your Thanksgiving weekend.  We had ours a month ago.

Speaking of the US  this old Tillotson HD 42mm carb from Toledo, Ohio on my saw may just work out on the rebuild
Worked good when I last used it.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 27, 2018, 10:58:05 am
Going over the project here and suprising myself with my last MacGyver rebuild I did on it in a broom closet 9 floors up 30 years ago, Lol.
Was pretty focused on it back then working with what little tools I had, probably why the girlfriend didn't hang around.

I decided on alky/nitro and I found this sweet 38mm billet carb listed on the internet. It just came out recently and they can't keep them in stock as the demand is so high.
Will have to buy a new pop off gauge, I can't find my old one.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 27, 2018, 01:21:48 pm
Yeah that 38 alky carb is $400USD.... Yikes.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 27, 2018, 03:40:15 pm
Why so much?

Alky HT carb





Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 27, 2018, 03:43:09 pm
LOL see where the carb pic came from now.

http://www.mikeclementsracing.com/Carburetor.html

(http://www.mikeclementsracing.com/sitebuilder/images/DSC04260-465x296.jpg)
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 27, 2018, 03:43:52 pm
ouch

Clements Carburetors
Butterfly/pumper-
$399.95
Now In Stock, Ready to Ship:
Clements pumper style, butterfly carburetors: These all new, fresh
design pumper carbs have been tested for well over a year now. We have
proven drill patterns for proper fuel curves on each type of Karting and Jr
Drag style engine.
Red,   28mm venturi
Silver, 34mm venturi
Gold, 38mm venturi
Available in 4 cycle alcohol versions as well as Gas and alcohol 2 cycle
versions.
These most beautiful, durable and HP producing carburetors are available
now priced well at 399.95 . Call 480-704-4087 to order.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 28, 2018, 07:11:15 am
Expensive alright but from research on VP Racing fuels website these latest aluminum billet carbs are the way to go. I like their oversized inlet strainer covers to hold that extra fuel.
Checking the inlet strainer hose connection on my tilly HD's cover it's a tiny hole reduced down from the 5/16" ID fuel line.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 25, 2019, 03:32:06 pm
I just kicked out the door the last of my customers saws. Now I can get back on schedule with my own gear.

Just last week I received my first check out of my pension fund. Only 61 so have to wait 4 years for my Canada Pension, my wife has under 8 years till full retirement at 55.
Decided no more repair and sharpening business, gave it a year trial and found too much of a PITA. Got too many unfinished projects on the go of my own.
Going to shut down the tree service after this summer. May sell out, may hold on to the equipment for a bit...for the right price.
Bikesaw is just a pile if parts at the moment but not for long.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on January 25, 2019, 09:22:36 pm
I just kicked out the door the last of my customers saws. Now I can get back on schedule with my own gear.

Just last week I received my first check out of my pension fund. Only 61 so have to wait 4 years for my Canada Pension, my wife has under 8 years till full retirement at 55.
Decided no more repair and sharpening business, gave it a year trial and found too much of a PITA. Got too many unfinished projects on the go of my own.
Going to shut down the tree service after this summer. May sell out, may hold on to the equipment for a bit...for the right price.
Bikesaw is just a pile if parts at the moment but not for long.


Sounds like your ready for a lot of changes.   
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 25, 2019, 10:42:12 pm
Yup, we like to travel, my wife was always behind me at timbersport  shows. Still have 3 young ones at home to keep us on our toes. :D
Time to work for myself , not for someone else. First project this summer is a cedar outdoor sauna for next winter. It'll be portable when the day comes when we move south of of the bush to farm country where we both were born and raised .
You can only take so much of a wilderness town if you weren't born raised there.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 26, 2019, 05:38:33 pm
Back on track with the 125 YZ build after lots of other chores to do and family life.
But have another distraction....local guy has a 2005 Yamaha YZ250 complete engine with Pro Circuit pipe etc. He had it professionally rebuilt years ago crank and everything and it's still sitting in the crate with no hours on it.
Great looking engine that specs claims it puts out over 50 h.p.at the rear wheel.
Only thing I'm a little uncertain about is its got a computerized carb with TPI and ECU.
I always wanted to build a 250 bikesaw but dang I hate to cut off its perfectly good 5 speed transmission.
Sooner put it in a go kart. Lol
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on February 28, 2019, 10:36:31 am
So the 2005 Yamaha YZ250 is a really good find seeing this engine is one of the highest rated top end powered 250 out there.
Price I can get it for is darn cheap too.

But I have some leads on a better MX 250 engine.  A 2003 KTM 250SX with crankcase reed induction. This one year KTM had the the top end power so high that the ordinary rider couldn't ride them WOT without killing themselves. Basically a factory works race bike available through the dealership.
2004 KTM had to change the powerband  to put the power lower and improve in the handling department.
This engine is more compact and lighter then the YZ250 also. There are lots of 300+cc big bore kits but what I heard about vibration problems no thanks.

Glad I'm taking my time on my build, changed my mind on carbon fiber not trusting this glued together expensive material.
Going to use magnesium alloy plate to replace the aluminum I've used in the past. Magnesium is 33% lighter then aluminum and offers better strength.

Going to run my General 18" 2 7/8" roller nose 0.160" thick lightweight bar with .050 modified .404 High tooth on the YZ125J.
The 28" 2 7/8" roller  nose 0.160" thick bar with .063 .404 High tooth on the 250. Tail of bar will need changing in contour.
Pic here.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 09, 2019, 10:20:10 am
So I didn't buy the 2005 Yamaha YZ250 engine, decided to stick with the plan of a  KTM 250sx.
Got my inspiration from a 18 year old brother of my daughter's friend. The kid is going into college for motorcycle tech and knows his stuff . He just bought a brand new 2019 KTM 250sx and what a beautiful dirt bike, I swore its compact engine was a 125 . But externally they haven't changed the design much for the last 20 years as I saw from his older KTM 250s. One was a 300.

So as my pic shows I put the YZ125 back together after cleaning up and checking out clearances etc for wear. Seals, bearings, ring gap,cylinder are all spot on in good condition. Luckily have lots of spare OEM gaskets and O rings. Even got a new OEM cylinder and piston.
Going to put it in the wood and make sure it runs as good in reverse rotation as it does in forward. But waiting for a carb kit for the Tillotson HD 42 mm carb. Its ball check valve was seized and is flooding. Once the welch plug is drilled and pulled out you can't reuse them .Thought about JB Weld .... so putting the HR 36mm and manifold back on, maybe it'll be ok for the test.
Last pics is a 2003 KTM 250sx...my holy grail, Lol.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 10, 2019, 10:59:21 pm
Getting a bit ahead of myself tonight by researching methonal nitromethane  race fuel.
Have come to realize to fully understand it I need to be a chemist, mechanical engineer and an optimist.
 Lol.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on March 11, 2019, 08:02:06 am
Can mix yourself. The one I used to use for hotsaws had like 8 ingredients.  EPA had cut into one of them so  1 had dropped off the list.
Was for karts called sprint fuel for the karts. Guy in Va mixed it.

Most folks got away from that that I knew using it I think  and just mixing their own with way less ingredients.  Was just getting to hard to get.

nitromethane hydrometer
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 11, 2019, 10:48:20 am
When I tried methanol in my 090 in early 1980s I once had a hydrometer but no complete kit with charts to compensate for air temperature and % , specific gravity etc. Just got instructions from a expert over the phone.
But today those kits are over $300 US. From from what I see nitromethane, methonal is still easily available here the other ingredients like you mentioned are no harder to find.
It's a learning curve alright and for what use my little hotsaw gets it's a good fit.
But like the cold start I darn well gotta get it right for all the travel with only a number of seconds in the wood.
Lots of trial and error,  seen too many guys my self included screwing things up with alky. Best time I had with it was when we had a light rain during the competition.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 15, 2019, 08:16:59 am
Here's a great video from the 2013 Squamish Days Logger's Sports Festival in British Columbia Canada.
Hotsaw event starts at 13:00 minutes.
Nice to see they still have the hotsaw 140cc limit rule, this is the rule I built my 125 bikesaw for over 35 years ago. I never ran the saw out there. Still plan to in the near future.
Funny reaction from Dennis Cahoon and the announcer while running his Honda CR125. Hahahaha
Great professionally done show watch the whole video.
https://youtu.be/RZxTMpo1to4
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 15, 2019, 11:12:31 am
Took a picture here.
Making gaskets this morning.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 17, 2019, 11:42:48 am
Here's a great video from the 2013 Squamish Days Logger's Sports Festival in British Columbia Canada.
Hotsaw event starts at 13:00 minutes.
Nice to see they still have the hotsaw 140cc limit rule, this is the rule I built my 125 bikesaw for over 35 years ago. I never ran the saw out there. Still plan to in the near future.
Funny reaction from Dennis Cahoon and the announcer while running his Honda CR125. Hahahaha
Great professionally done show watch the whole video.
This video will get me a great big "LIKE", Hahahahaha....
2015 Squamish Days Loggers Sports. Hotsaw event starts at 12:40
https://youtu.be/vtrXSCVWphc
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 17, 2019, 07:08:33 pm
Those little 125 bikesaws of Cahoon and Paulsen really rip in that big tough ole 22" Douglas fir.
To run the .404 High tooth on those 125s in that big wood you need low gearing and it's gotta be throwing good chips.
Would be pretty tough going for the fastest 3120XP, Lol.

Nice thing about these CANLOG  events out in B.C.and Alberta the rule is "Show center hosting an unlimited  hotsaw event is required to host another hot saw event up to 140cc.

CANLOG (Canadian Logger Sports Association.)
"Safety in the loggers' Sports is the same as Safety in the Woods."
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 19, 2019, 05:15:47 pm
Have been testing the YZ in wood and think I got the engine reverse rotation ironed out. I had to modify the stator plate to accept the 2 charge coils in reverse mounting. Took alot of head scratching to figure this out. Nothing on the internet of someone else doing it.
But there is tuner companies who do sell ignition upgrade kits in either clockwise or counter clockwise rotation for the kart industry where MX engines are used.

So what do you think of my homemade expansion chamber silencer, filled it with stainless steel scouring pads....neighbors are alot more happier now, Lol.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 22, 2019, 08:35:55 pm
Final field testing with the hotsaw today in counterclockwise  rotation. Notice the chain on backwards? A bit scary with left hand drive, but  kevlar sleeve on my left arm and kevlar mitts and hardhat reassured me,  Lol.

She's now ready for the rebuild with right hand drive, chain turning in regular rotation, horizontal cylinder position with carb up.
Have one more trick in my plans, getting  in touch with a Ohio performance company and looking into a custom PVL ignition setup for this engine. They have a counterclockwise version with fixed analog timing, a setup kart drag racers use with their Yamaha MX engines. All my mods to my CDI ignition may go into a bin as I like what they have to offer.
Anyways the project is now on the back burner. Taking a break for 2 weeks, this weekend I'm taking my wife and kids to Rome, Italy for some site seeing.
I'll  send some pics.
Here's the YZ after attacking a log at ground level.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 24, 2019, 05:08:37 am
have not bought anything from him in a couple years cause I have not built any bikesaws , Guy name is Perry and lives in southern Ontario and that's where I get all my PVL stuff from , he is quite abit cheaper than ohio . He sells a ton of go kart stuff . I will see if I can find his number
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 24, 2019, 10:12:56 am
have not bought anything from him in a couple years cause I have not built any bikesaws , Guy name is Perry and lives in southern Ontario and that's where I get all my PVL stuff from , he is quite abit cheaper than ohio . He sells a ton of go kart stuff . I will see if I can find his number
Thanks Ed, I was just going to PM you for advice. Only the analog ignition is available in counterclockwize rotation so the Ohio company says and their prices are high.
Is analog a better ignition curve then CDI for a hotsaw?
I was thinking if dragster karts use analog it must be the way to go, seeing hotsaw and drag kart racing are a very similar rpm curve.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 25, 2019, 10:21:16 pm
it really does not matter , its not like your pulling the motor from 4000 rpms in the cut up to wide open, One thing you need to know thou is you will have to build a plate for the stator to bolt to BUT take your time and make sure its dam square to the crank cause the rotor part fits on the crank and it spins inside the stator with very little clearance , like you got .002 to play with, the more perfect the clearance all the way around the rotor the better the spark is . For the 2002 - 2007 cr 250 Honda motors I built the only thing for the Honda was the rotor . Sparkplug is another very important thing to make sure you got correct with that PVL system. I believe the system I use works either way 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 25, 2019, 10:22:16 pm
analog is what we used
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 26, 2019, 03:42:35 am
Thanks Ed, the PVL kit that fits my 1982 YZ125 motor comes complete with the 110mm stator plate, rotar and coils, etc.
I use the Champion N84 iridium racing plug, never fouled one yet.
If you got that Perry's # please PM me, that would save all the hassle and expense shipping out of Ohio.
Yes those older Honda CR 250 are good motors, I saw a 2005 motor on Kijii little while ago.
 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 26, 2019, 11:53:13 am
As I said earlier I'm away with my family in Rome,Italy. Here my wife took this picture today of me and my daughters at the Colosseum where we took a guided tour. Light rain today but was hot yesterday and hot again for tomorrow.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 26, 2019, 12:01:31 pm
Here's a pic of my family yesterday.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on March 26, 2019, 02:58:51 pm
Great pics. Thanks for sharing.

Never got to go there to date.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 26, 2019, 06:38:47 pm
they come with a plate but I always had to build a plate for their plate to bolt to and with the Honda you need to build your plate to hold the crank seal in place .
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 26, 2019, 06:39:29 pm
have not gotten Perry number yet, the website has changed names
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 27, 2019, 12:40:32 pm
they come with a plate but I always had to build a plate for their plate to bolt to and with the Honda you need to build your plate to hold the crank seal in place .
have not gotten Perry number yet, the website has changed names
Thanks Ed, no rush it will be a while before I get back home and back working on the saw.
The PVL ignition upgrade will be the last thing I'll do in the project anyways.
I decided on alcohol carb 38mm???, new pipe, .404 high tooth chain , 3120XP decompressor , store chain oil lightly pressurized in cylinder instead of anti freeze coolant  to oil chain.
Presently the saw at the moment weighs 40lbs PHO with pipe, starter rewind, oiler etc. Hope to have it below 30lbs and super compact when I finish.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 27, 2019, 07:54:44 pm
they come with a plate but I always had to build a plate for their plate to bolt to and with the Honda you need to build your plate to hold the crank seal in place .
The only plate with built in seal on this Yamaha I built was the one under the drive sprocket with bar pad. Both crankcase seals have their own built in seal retainers.
I'm going to have to replace both main bearings and seals now that this engine is running in reverse rotation.
Someone told me once the piston intake skirt thrust wear will change too but I don't think the crank connecting rod is offset so there shouldn't be any difference in thrust wear.
The PVL stator plate is held in place by the same  2 setting screws the Yamaha plate uses. It's centered by a countersunk indentation in the crankcase. Yeah the rotor/flywheel has a very small clearance between the stotor plate.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 27, 2019, 10:07:53 pm
leave the methanol carb alone , if the motor is running proper pump gas is all you need . Biggest thing I see wrong is lots of people think and feel they need more power and some kind of race gas . If the motor is not built to that fuel you loose hp not make horsepower . Same with big carb, I use the stock carb on my cr 250 motor with stock bore and stroke and Dave has taken a full year to try and learn how to use the power that motor makes, he is getting closer . Biggest thing you need is getting a proper built pipe that fits the rpm the motor is meant to turn in the wood . If your cutting small wood you can get away with 3/8's chain but any bigger wood you want high tooth .404
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 27, 2019, 10:10:19 pm
no need to put any pressure on chain oil, the speed of the chain going by the oil hole drilled in bar will suck the bar oil out perfect .
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 28, 2019, 01:07:37 pm
Thanks for the advice Ed, really appreciate it.
I had the YZ125 cutting good with the big Tillotson HD 42mm, but runs good with the 35mm HR too. Looking at saving weight and I like the looks of those new Tillotson race carbs.
I was thinking menthenol as it would make the engine run cooler seeing it's a liquid cooled with just bar oil in the cylinder for cooling. It's something I want to experiment with in the future with a couple of different milled heads compression wise. And pipe.
But yeah 92 gas with Klotz or Yamalube R at 24:1 does work very well the way the engine is setup with factory stock pipe and cylinder/head. I only locked the power valve wide open and polished the exhaust port.
I remember your advice about too much compression.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: EHP on March 28, 2019, 06:08:33 pm
if engine is running right your finished your run before it makes any heat , were running 38 mm on 247 cc motor, smaller carb set proper cold starts a lot better, takes first cookie of a lot better as well . If your running a minute then I can see the bigger carb helping but in 3 to 5 seconds it will hurt you
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 28, 2019, 07:44:02 pm
if engine is running right your finished your run before it makes any heat , were running 38 mm on 247 cc motor, smaller carb set proper cold starts a lot better, takes first cookie of a lot better as well . If your running a minute then I can see the bigger carb helping but in 3 to 5 seconds it will hurt you
Thanks Ed.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on March 28, 2019, 07:50:40 pm
And seeing my dirtbike motor is no longer for bike use I probably wouldn't need 24:1 Yamalube R mix what the manual recommends either. 32:1 may be a better mix for these short burst runs.
Klotz is available in Manitoba here in a good variety of Techniplate.
But I've used Yamalube R in the past and had good success with it.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 07, 2019, 10:54:31 am
Only the analog ignition is available in counterclockwize rotation so the Ohio company says and their prices are high.
Is analog a better ignition curve then CDI for a hotsaw?
I was thinking if dragster karts use analog it must be the way to go, seeing hotsaw and drag kart racing are a very similar rpm curve.
Back from holidays and back to the grind. Little break helped clear my head now that I'm back on the hotsaw project.  Came to realize my 1982 YZ125 CDI ignition is analog,  reason why I was able to reverse the engine and ignition rotation. CDI can be either analog or digital.
Digital CDI didn't come out on bikes until the late 1980s- early 1990's(even my old Stihl 066 is digital) So I may just stick with the stock Hitachi analog CDI ignition as I don't know enough about  the PVL ignition curves.

Also re thought about connecting rod offset as there is of course offset at BTDC & ATDC. So there very well may be different piston skirt thrust wear with the engine running in reverse rotation...I just can't wrap my head around that just yet. Any ideas ?

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 07, 2019, 11:42:45 am
Here's a pic of the latest KTM 300 2 stroke with direct transfer port fuel injection.
No more premix as it's also now oil injected. System adds 5 lbs over the carbed model. Looks like KTM has a future for the 2 stroke dirt bikes.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 08, 2019, 07:48:10 am
Ordered some NGK racing plugs last night. Boy it's hard to find non resistor NGK race plugs. Was able to get a couple each of B8EG and B9EG but that's all she wrote.
Looking over the saw I realized its got a resistor NGK plug cable cover on it, Lol. Didn't know 35 years ago that resistors were not the way  to go on this older race engines.
So I went and ordered one of those fancy red silicone rubber non resistor covers.

Here's a pic of what my hotsaw will weigh with bar/chain included. Sure doesn't feel like much holding it with 2 fingers, Lol.
I use 2 of these to warm up every day when I workout before breakfast.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: ray benson on April 09, 2019, 09:46:33 am
 Saw both of the NGK plugs on ebay canada
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 09, 2019, 11:10:52 am
Ray, I only deal with Amazon but last resort I may one day use ebay.
There's one other NGK cross reference racing plug with the larger standard diameter electrode tip that I want to experiment with. B8ES
All the motorcycle forums talk highly of the smallest tips for durability and reduction in plug fouling which may be fine for a motor running WOT minutes at a time.
But for a hotsaw only running WOT for 3 to 10 seconds it's a different story.

I'm presently building another log stand I built years ago. It's mounted to a sheet of 3/4" plywood for portable use. So then I can take it , the wood and the hotsaw out to the bush and make all the noise I want, with no worries of neighbors calling the cops on me, Lol.
Here's a pic.
These old ones are a bit high, they work fine with the 10"×10" but to run 20" rounds I'm making this new one much lower to timbersports standards.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 12, 2019, 07:20:59 am
I ordered more non resistor plugs off Amazon more different heat ranges, plus another plug non resistor cover.
Lots of experimenting to do when the saw is back together.
Not getting ahead of myself but researching carbs and like Ed said about going to big I will stay focused around 34mm throttle bore and stick to gas.
Until the day I may ever modify the porting I'll stick with what the factory limits are.

So I'm having lots of fun with this project, definitely alot cheaper then restoring a muscle car that was once always on my radar, Lol.
So why am I so attached to this little 125 engine?
Back in 1989 when I worked for Stihl Canada Hans Peter Stihl paid a visit to our Edmonton branch and I found him looking at my little hotsaw in the service shop all by himself.
Me and him had a really good talk about the Yamaha . He even picked the saw up to get a better look at it.

That my friends is something I will never forget, and 30 years later while I'm able I will not leave my little piece of history alone.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 17, 2019, 12:18:44 pm
So I bit the bullet and bought a Penton modified PVL ignition for the little YZ125 hotsaw.
This definitely cuts into my budget buying a new Stihl MS500i, Lol.

Over the last few days through emails and phone calls to Dan Gray out of Maryland he is shipping me the PVL 70115 analog bi directional ignition.
I couldn't find a a better source for these Penton modified PVL ignitions.

Dan took over (out of business Ohio based Penton Racing Products)  PVL and Powerdynamo ignition systems from Jack Penton two years ago.

A little history lesson:
In 1968 John Penton and his brothers (Husqvarna motorcycle distributor)from Ohio put up $6000 for Austria based KTM to build them a prototype off road racing motorcycle. (Husqvarna in Sweden were not interested.)
At the time KTM was only making bicycles and mopeds.
From then on the famous Penton Motorcycle company was developed and in 1978 KTM bought out the Penton Motorcycle brand which started the KTM mx bikes available today.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on April 17, 2019, 01:41:27 pm
I remember racing with folks on new KTM's in MT back in 84-85. Least I think that is what the white with blue accents and lettering bikes were.
I was on my 81 can-am back then.   

Never knew the ktm story. Pretty interesting.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on April 17, 2019, 01:46:05 pm
Yep that was them

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 17, 2019, 03:53:50 pm
Kevin, thanks for posting. That's awesome.
Sven Johnson held the hotsaw  world record in the early 1980's with his big bore CanAm 250.
Cold start , 3 cuts in 20" white pine in 7.06 seconds.

When I was talking with Dan Gray yesterday on the phone , with his wealth of 2 stroke knowledge I decided to build a 2000-2003 KTM 380SX for my next hotsaw project.
Run her in the bigger wood completely stock with a good pipe and leave it at that. ;D

Here's a pic of Sven with his CanAm hotsaw.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 19, 2019, 07:42:38 am
Found myself a crankcase for a KTM 380 SX on ebay in excellent condition for under $300.
Getting ahead of myself , gotta change the channel and get back to the YZ125.
PVL ignition will be in the next couple of days.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 24, 2019, 09:46:09 pm
My German made PVL racing ignition came in my mailbox today all the way from Maryland.
Very nice setup for my YZ125 engine, direct bolt in with no adapter plates needed.
Alot lighter then the OEM ignition on the saw.
Will get some weight comparison's tomorrow and get it running.
Here's a pic on my kitchen table.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 25, 2019, 03:32:24 pm
So I compared the weight differences between the PVL ignition and the Yamaha OEM Hitachi ignition. The PVL is a full pound lighter.
Also did some research and found the claimed 70 h.p./20,000 rpm VM 125 kart engine has the exact same PVL ignition. So it looks like I found a good setup.
Didn't get it installed today, had work to do on the wife's mini van.
Tomorrow will be a better day.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 27, 2019, 01:00:43 pm
Had to make another temporary starter rope spool, last one broke last night.
Saw runs really nice with the PVL ignition in reverse rotation.  Wish I had it on the saw years ago!!!!!!

Will start tearing the saw down for the complete redesign now.
Going to replace all bearings and seals as I don't trust the ones already in it for the reverse  rotation.
Still doing research on magnesium  6 mm  plate and 20mm dia. structural rod. Can get it from eBay no problem now that I got a account setup. Stuff is cheap in price out of China.

Going to start up the tree service for a bit as I got a young guy looking to buy my equipment and business. I'll hire him for a groundie for now to show him the ropes and how to make money slaying trees and stumps.
I told him not to quit his day job because tree work season up here is 6 months if I'm lucky.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 29, 2019, 01:40:49 pm
Thought I'd post a pic here what I used to start up the YZ125 after getting rid of the rewind housing for the new ignition

Old garage door pulley I had laying in the shop. Nicely holds a 17 mm socket  which connects to the PTO crank nut.
Wrap a starter rope around it and yank the saw to life. Just had to watch out for the pulley spinning around the yard, Lol.
Now don't think I'll keep using it, I am building a proper bolt on pulley.

Now how's that for redneck? Hahaha...
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on April 29, 2019, 01:46:08 pm
Forgot the last pic of it here installed .
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on May 05, 2019, 11:46:21 am
Going to start up the tree service for a bit as I got a young guy looking to buy my equipment and business. I'll hire him for a groundie for now to show him the ropes and how to make money slaying trees and stumps.
I told him not to quit his day job because tree work season up here is 6 months if I'm lucky.
Well after getting all my equipment ready to go and setting up some jobs we get this,Lol.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on May 05, 2019, 12:02:26 pm
So it's a good excuse to get back into the workshop and do some more tinkering.
Got my design plan down for the 125, compact and light as possible.
Balanced perfectly with 18" deep belly bar to pick up saw with left hand after pulling the starter rope with right hand when doing cold start.
Saw will be under 30 lbs with b/c fully fueled.

To keep from getting bored with the project I'm also focusing on a future 250 hotsaw build.
After alot of hee hawing about YZ, KTM, Honda. I've decided I'd be foolish not to pick Honda CR250. So Honda CR250R it will be.
These Honda's for the last 30 years were the "top fuel dragsters" of the mx dirtbikes.
Lots of trick race parts and still ongoing development with these older design Hondas readily available for hotsaws.
They got the engine right the first time and there's no looking back.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on May 05, 2019, 12:28:43 pm
Biggest mistake I made building my workshop was putting the window at the back side of the work bench. Terrible glare especially when your eyes are getting old with symptoms of cataracts.
Photo right here is what I'm talking about.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on May 26, 2019, 10:03:51 am
I like rainy days, good excuse to be in a warm shop working on the bikesaw.
Busy making up side plates for the engine out of 1/4" plywood.
Seeing the engine will  be horizontal I'm trying different top handle angles for balance and ergonomics with bar chain in the cutting position.Rear handle will bolt to the cylinder head.
Almost got the perfect profiles for what I need. I will then use these wooden sideplates as templates to make the metal ones.
I'm going with 6061 T6 aluminum alloy in 3/16". May try magnesium on the 250 build if I can find a welder who can work with it properly.
Looks weird with wooden parts bolted to the bikesaw at the moment. Not posting any pics of it to avoid being a joke if reposted some where else without proper explanation,  Lol!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on May 29, 2019, 07:53:56 am
Here's a pic how I got my tune pipe layout for the little YZ125.
Pipe is laying flat on the ground with engine sitting on top. Still have to weld the pipe back together and add rubber mount brackets.
As Ron Hartill told me 31 years ago I have to make the saw as compact as possible.
Well I've finally done that. Based around the PTO crankshaft stub inch for inch I got the powerhead with handles the same size as my Husqvarna 562XP in  length, width, height with handle layout etc.

With no header pipe sticking forward of the powerhead I can cut from either side of the log and  only have 3 inches of bar pad from sprocket to log.
Not sure if I'll use the 10oz 090 rear handle as pictured,  may make my own.
With the b/c on she looks like a cobra snake coiled up ready to strike. Hahahaha.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 04, 2019, 11:25:56 am
Here's a pic how I got my tune pipe layout for the little YZ125.
Pipe is laying flat on the ground with engine sitting on top. Still have to weld the pipe back together and add rubber mount brackets.
As Ron Hartill told me 31 years ago I have to make the saw as compact as possible.
Well I've finally done that. Based around the PTO crankshaft stub inch for inch I got the powerhead with handles the same size as my Husqvarna 562XP in  length, width, height with handle layout etc.

With no header pipe sticking forward of the powerhead I can cut from either side of the log and  only have 3 inches of bar pad from sprocket to log.
Not sure if I'll use the 10oz 090 rear handle as pictured,  may make my own.
With the b/c on she looks like a cobra snake coiled up ready to strike. Hahahaha.


Ok delete my last post. Change of plans, as my pic below shows this will be my bikesaw's final profile.
My 61 year old thinking cap doesn't make decisions as well as it did when I first built this saw at 25, Lol.
I'm still basing the powerhead dimensions to my 562XP with handle placement etc. And be damned the fuel tank I'm building out of 6061 T6 .080" will also have the same 0.655 litre(22 oz) capacity. The attached oil tank will be a smaller 4.5 oz though , more then enough oil and fuel for warm up and 3 cuts. The fuel tank will be double the size of the bikesaw's original fuel tank and that's because of possible plans to run alcohol in the future.

The pic shows where I'll put the 2"×4"×6" fuel tank  and attached oil tank in the front of the left over cut off transmission housing cavity. The side plates will be horizontal at the top edge enclosing the tanks and also the PVL one piece CDI and ignition coil. A flat top cover will close it in and top handle uprights off the side plates will go up 4". Rear handle with lower attached aluminum hand guard will bolt to the lower half of the cylinder head.
Pipe will lay flat on ground pointing rearward not wrapping around the head as previously mentioned. The four support legs are not permanent, they're just there for the build.

My next pics will be closer when I'm near finished. They will show a hotsaw with no external fuel/oil tanks and ignition  coil. Everything streamlined and self contained.
If this project works out well my 250cc saw project will be very similar with a 1983 Honda cr250r that also has the same right hand ignition profile and no powervalve for a bonus.
 PVL also makes a analog bi directional ignition for this motor.
Lots of fun ahead.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on June 04, 2019, 02:04:57 pm
I know all about that thinking cap deal.
I do something. Sleep on it and my brain is still thinking about it and in morning I have a whole new plan. 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 04, 2019, 03:25:13 pm
I know all about that thinking cap deal.
I do something. Sleep on it and my brain is still thinking about it and in morning I have a whole new plan. 
Yup same here, overthink it to death then in the morning I got it figured out.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 12, 2019, 01:25:10 pm
If someone has a chance could you please ask Dennis Cahoon what thickness carbon fiber he used on his hotsaw builds?
I'm still on the fence whether to build my sideplates and handle supports with it rather then use 3/16" 6061 T6 aluminum.
I found a good supplier out of Japan with a K3 cross weave matte finish, but can't decide  whether to go 5mm thick or thinner.
$200 for a flat 16"×20" plate is pretty pricy to just save a lb. or two.
I only need to make flat parts, no contours needed.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 12, 2019, 04:07:11 pm
I just installed this setup today. Bought them both on sale at Canadian Tire. Waited awhile for them to go on a good sale price.

The BladeRunner miter jigsaw will cut all my parts needed whether it aluminum or carbon fiber. The sander will do a nice finishing job on the edges.
Got them both hooked up to a 5 h.p. Rigid shop vacuum.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 14, 2019, 03:51:48 pm

Here's a piece of thin plywood I cut that has the same measurement as the piece of carbon fiber I need, 16"×20"×3/16". The carbon fiber sheet will be a tad thicker at 5mm. That piece of carbon fiber will cost me $240 CDN.
6061 T6 .190" or (approx 3/16") aluminum is heck of alot cheaper. But the cool factor is still there with the CF. I rough guesstimated the parts That I will make out of the sheet would save me 1.5 lbs with the CF over the aluminum.
Speaking of cool factor,  the 2 stroke performance market is a wonderful place. Just from California all the way up north to Idaho there is companies who build some of the best tune pipes. Some dedicated to blueprinted competition carburetors only. Another company who specialize in cylinder head modifications. Another one that builds a CR250 or YZ 250 from the CNC billet crankcase to a patented cast cylinder and piston.
What a wonderful expensive hobby to get into. Buuutt still takes less space and coin then getting into car drag racing or muscle  show cars.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 15, 2019, 12:22:27 pm
I ordered through Amazon this morning 2 different thickness plates of carbon fiber, will have them in 4 days and only cost me a $100.
These are only for the left hand ignition side plate and top cover. I'm going aluminium for the PTO side plate.
One top handle support will be CF and the other 6061 T6 aluminum. I remember in past competitions some shows will only allow reinforced metal chain guards and sprocket covers.
Made a big step in my build this morning,  now to get back to work and cut more wood for a living. My apprentice is starting to get the hang of things.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 19, 2019, 10:33:16 am
Well as I'm finding on this 3rd rebuild over 35 years and counting taking my time in decisions is paying off.
Another decision now is to cut off the crankcase ignition housing. No need for a sealed ignition housing now that this bikesaw won't be in any water, dirt or mud. Might as well show off the new $700 PVL ignition plus save some more weight and bulk too.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 20, 2019, 05:17:54 pm
Lots of good information from the NHRA drag racing rule book that can relate to hotsaw racing.
I'm building a hard anodized interior aluminum fuel tank for whatever fuel I may run. NHRA says vented fuel caps are a universal ban in racing. Lots of tank mounting tips also can apply to hotsaws.
Methonal castor mix with about 10% nitro sounds like a really good option.
Especially for  an engine in my case that only runs a few quick races a year.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 20, 2019, 06:12:50 pm
Isn't this a beauty for sore eyes?
This will be the heart of my little YZ. Blueprinted and setup for my engine with 5/16" fuel line and maybe  a remote Walbro pulse fuel pump.  :)
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 20, 2019, 11:54:29 pm
Carbon fiber plates came in this evening.  Holy crap this stuff is tough!! One plate is only 1/16" thick and is stiffer then any metal  I've handled  near that gauge.
This stuff is light and rings like a bell when tapped  with a dinner fork.

The thicker plate is overkill and it's only 1/8" thick! Sure glad I didn't order the 3/16". Lol.
Really nice looking stuff!
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 25, 2019, 11:39:57 am
I just watched the whole Oct. 2018 Stihl Timbersports in Liverpool, England.
Here I thought Laurence O'Toole won the hotsaw with the DC Honda, but I find German Robert Ebner with his Wankel rotary hotsaw won it with 5.68sec. adjusted to 5.51sec.
And as last video shows he earlier set a world record with the Wankel at 5.23.
According to Stihl Timbersports rules the Wankel is legal.
Move over Honda, now I wonder if we'll see some of the old Sachs Dolmar Wankel saws making it in stock appearing events,Lol.
https://youtu.be/8RpsHM-HBAA
https://www.facebook.com/stihltimbersportsUSA/videos/10154247219568556/?sfnsn=mo&s=656148609&w=y
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on June 25, 2019, 03:11:59 pm
Top 8 times. Record is 5:20  https://www.stihlusa.com/stihl-timbersports/records/

1.    5.20    
WR
   Dirk BRAUN    
GER
   Poplar 46
   German Championship 2016 GER
Saturday, August 13, 2016
2.    5.23    
WR
   Robert EBNER    
GER
   Poplar 46
   German Amarok Cup 2016 GER
Monday, May 23, 2016
3.    5.27    
WR
   Jason WYNYARD    
NZL
   Poplar 46
   USA Championship 2007 USA
Sunday, July 1, 2007
4.    5.38    
PB
   David BOLSTAD    
NZL
   Poplar 46
   USA Championship 2007 USA
Sunday, July 1, 2007
5.    5.39    
NR
   Dion LANE    
USA
   Poplar 46
   USA Championship 2007 USA
Sunday, July 1, 2007
6.    5.43       David BOLSTAD    
NZL
   Poplar 46
   Individual World Championship 2007 GER
Saturday, October 6, 2007
7.    5.48       Dirk BRAUN    
GER
   Poplar 46
   Individual World Championship 2016 GER
Saturday, November 12, 2016
8.    5.51       Robert EBNER    
GER
   Poplar 46
   Individual World Championship 2018 GBR
Saturday, October 20, 2018
9.    5.53    
PB
   Matthew COGAR (Matt)    
USA
   Poplar 46
   Individual World Championship 2
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on June 25, 2019, 05:40:36 pm
The stats says 46cm (18.1") poplar. We need to see world record times in 19"- 20" white pine or B.C. Canada 22" Douglas fir.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on June 26, 2019, 08:14:37 am
They are all listed poplar 46cm diameter for the records in STS.   

I prob have the other saved. Might not be updated though.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on June 26, 2019, 08:21:24 am
Would bet been broke and not submitted for updating.

white pine.
19" rd.     Matt Bush            05.085   3    Dead Start   2003
20" rd.     Matt Bush            05.945   3    Dead Start   2002

Ponderosa pine
20" rd.     Rick Halvorson       07.15    3    Dead Start   1995
34" rd.     Mel Lentz            04.85    1    Dead Start   1993
36" rd.     Dennis Harvey        05.10    1    Dead Start   1993

Dough fir
30" rd.     Steve Johnson        04.51    1    Live Start   2000
30" rd.     Dennis Harvey        06.86    1    Dead Start   1993

Cottonwood
20" rd.     Jim Taylor           06.175   2    Dead Start   2001
27" rd.     Steve Johnson        02.47    1    Live Start   2001


Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on August 07, 2019, 07:26:10 am
From some research I read about shifter go kart racing their easily getting 50 hp out of a YZ125 bike engine. But they're finding older crankcases are weaker causing flex taking out the cranks.
Which makes me re thinking my carbon fibre and weight reduction project.
Just may have to go back to the 1/4" 6061 aluminum side plates.
I see some of the top Honda motorcycle builders are running  ESR custom billet crankcases. Not sure if DC hotsaws is doing the same.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on August 07, 2019, 07:45:14 am
I remember back in the mid 1980's when the Stihl 064 and Jonsered 670 were introduced.  They had to beef up the crankcases later on due to bottom end failures when longer bars were used.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on August 07, 2019, 07:55:50 am
371, early 372 were same way. Later 372 had extra webbing and little more weight.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on August 07, 2019, 08:01:18 pm
So did a little more looking at my engine and came to realize if there was any crankcase flexing on a motorcycle or shifter kart engine it would be through the transmission.
A racer on a kart or dirt bike popping wheelies, doing jumps and speed shifting would put a heck of alot of stress on cases and bottom end.
So I don't think making 3 smooth cuts in a 19" log will be any where near as much stress.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on August 28, 2019, 03:29:41 pm
Update.
I just ordered more carbon fiber on Amazon, this plate will be
16"×20"× 3/16" adding to the 1/8" and 1/16" plate I already have.
The only piece of fabricated aluminum on the saw build will be for the fuel and oil tanks.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on August 31, 2019, 10:18:11 am
Ordered 4mm, 5mm, 6mm, end mill cutters to drill holes in the carbon fiber. Plus stainless steel threaded rivets and three different styles of metric cap screws.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 02, 2019, 05:42:07 pm
Happy Labor Day to all US members.
It's Labour Day here in Canada too! ;)

Speaking of the US, next month I'm taking my family to Charleston,  South Carolina.  Hopefully the hurricanes hold off until then, but I'm told October is the best time to holiday there avoiding the earlier hot temperatures.
Should be a really nice trip to see the historical sites and nearby Savannah, Georgia.  Supposed to be one of the best areas to see.

So I made a deal with my wife, kind of like a trade for rebuilding my bikesaw and getting back into timbersports.

Here's a photo of my end of the deal. I just finished building this patio and fixed up the outside of the chainsaw shed.
Now I can sit with the family around the fire pit and still be close to the shed. :D

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 11, 2019, 09:43:12 pm
My 5mm(3/16") carbon fiber plate came today a few weeks early.
This stuff is tough and light, feels weird in my hands how stiff it is and so light.
I got no worries about making a one piece sideplate with rear and top handles out of it.
Just waiting for a couple of 1" aluminum billet fuel and oil caps with weld on tank flanges.
Still lots to do before I start cutting the 5mm, 3mm and 1.5mm carbon fiber.  Still lots of plywood sideplate templates to make with trial and error to get it all just right with balance etc. (Going with the Jonsereds 601 right hand side rear handle profile).

No worries about time schedule as a long winter is closing in and spring so far away.
Picture here of this amazing product.
16"×20"×3/16"

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 12, 2019, 12:23:48 pm
So I was thinking seeing the bikesaw engine will be sitting on its expansion chamber tune pipe, how can I pizz rev and tune it while it's sitting on the ground?
I found this while looking through the kitchen cupboard.
A silicone baking sheet that can take 450°F and make a great vibration insulator. ;D
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on September 15, 2019, 08:13:54 am
well load that with brownie mix by the time you get the saw tuned pipe would have cooked the brownies
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 16, 2019, 11:42:59 am
well load that with brownie mix by the time you get the saw tuned pipe would have cooked the brownies

I just showed my wife this and she said "Your not using my damn epicure pan!"
Lol, looks like I'll be heading to Walmart to find something else.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 23, 2019, 11:04:31 pm
Some more goodies came in the mail today. All the way from China via Amazon.ca
Aluminum billet weld on 1"  fuel and oil caps.
Also got a chunk of 2"×4"× 0.125" seamless aluminum tubing from my chainsaw mill's slabbing rails for the saw's fuel and oil tanks.
I'm still busy slaying trees for a living so not much done lately on the bikesaw  build.
Long cold winter coming around the corner then things will start happening.
Here's a photo.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on September 24, 2019, 01:32:30 pm
Looks like you will have a lot of material together come winter so you will have something to do. 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 24, 2019, 02:28:13 pm
Looks like you will have a lot of material together come winter so you will have something to do. 
Yes my parts are coming together. Nice thing about not rushing into something is decisions can change daily.
 Nice thing about living in a nickel mining town I can find good welders and machinists plus stuff like titanium fasteners etc. Don't have to buy bulk.

Next step besides smoothing out my motors weight reduction cuts is building the joined fuel and oil tanks. It will be only 5" wide which is how wide the top handle will be between the 2 c.f. side plates. It will hold 18.5 oz fuel  in case I want to run methonal plus baffle material to cut down on vibration created air bubbles.  The oil tank will hold 6 oz at 2" wide to allow 3" under the top cover for the one piece PVL ignition module and coil to be mounted beside it.
Plenty enough of fuel and oil for warm up and 2 cuts in a 22" doug fir log which will be the biggest in my travels. Might get three 19"-20"cuts in pine or cottonwood in other places.
Here's a few pics how the fuel/oil tank will look and where it goes.
Already got a welder lined up who does really nice work tig welding aluminum.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on September 25, 2019, 06:38:54 am
steady progress and hopefully it is going to be a force to be reckoned with on the cutting block I have enjoyed following this thread
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 25, 2019, 07:47:13 am
Thanks Pete, it has been an interesting last couple of years. I'm glad you're enjoying all my rambling and hope others are too.
I'm not out to make a fire breathing monster, with its small 125cc displacement it's far from it. I have a set budget and am enjoying doing this myself.
For the love of the sport I know I can make it competitive for the smaller size of wood I intend to focus on which is 12"-16"round.
When everything is said and done it will come down to the chain and drive sprocket gearing.
The right hand ignition 1983 Honda Cr250r will be another project I'm looking towards in the future.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on September 26, 2019, 06:48:45 am
At least this year you are not thinking about the build while on holiday
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 26, 2019, 07:52:20 am
At least this year you are not thinking about the build while on holiday
Actually next month when we're on vacation in South Carolina and Georgia I got leads finding some  moto cross and karting engine speed parts.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: dpjones on September 26, 2019, 03:23:30 pm
Where are you going to in Georgia?
DJ
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 26, 2019, 04:31:02 pm
DJ, Savannah. We'll see how much time we have as we'd like to travel along the coast south of there.
Our main stay is Charleston and area for the first week.
Forecast looks like lots of hot weather.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: dpjones on September 26, 2019, 10:03:38 pm
I was just wondering, I'm in NW Ga. and hot is right, hot and dry, been setting some records here.
Thanks
DJ
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 27, 2019, 08:16:57 am
Some more part finds on Amazon of interest... M5  M6 titanium bolts used for the bicycle mountain bike market.
So much to choose from and I'm not even checking out aircraft quality yet.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 27, 2019, 08:29:33 am
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 27, 2019, 08:58:29 am
Real learning curve here. Not all titanium bolts are the same. These aerospace grade titanium bolts are grade 6.
These M6 button heads (but in longer thread) will bolt the PTO carbon fiber side plate to the crankcase.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on September 27, 2019, 10:20:43 am
That is some cool stuff there.    I did not know these bolts were available on line.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on September 27, 2019, 10:31:18 am
That is some cool stuff there.    I did not know these bolts were available on line.
There's an endless amount of different design product. Alot of it is used on the new Boeing 787 for example and the beauty about Amazon is you can order only 4 pieces if you want.
Then there's the aluminum 7075 bolt and fasteners market which are even much more lighter in weight if strength is not an issue.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 05, 2019, 07:40:59 pm
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff

So I need to clarify my comment of "5X stronger then steel and half the weight."
That's "strength to weight ratio". Just like the old saying of spider silk being stronger then steel per say.

But as I look at my bike engine's cylinder and head's huge 9 carbon steel studs and nuts that only require  18 and 25 ft. lbs of torque, I see no reason not to replace them with titanium.

In order to get this powerhead safely down to the weight of a Husqvarna 3120XP every gram every ounce adds up.
Prime example is of the earliest Stihl 064AV, to get to the weight of a modern day MS460 Stihl threw every trick into it including little 4mm cover screws.

I got all winter to get this little bikesaw to where I want it at the best power to weight ratio along with compactness.
It's sure alot nicer on this third rebuild in my heated well setup little shop.
The garden shed in the trailer court and the 9th floor apartment broom closet are far but fond memories. Lol...
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 06, 2019, 11:11:51 pm
Found these aircraft grade M6 titanium bolts to replace the Yamaha's crankcase bolts. Also these bolt nuts will find a use in the build.
5 times stronger and half the weight of steel.
Easily shows why the racing industry is using this stuff

So I need to clarify my comment of "5X stronger then steel and half the weight."
That's "strength to weight ratio". Just like the old saying of spider silk being stronger then steel per say.

But as I look at my bike engine's cylinder and head's huge 9 carbon steel studs and nuts that only require  18 and 25 ft. lbs of torque, I see no reason not to replace them with titanium.

So I need to "re clarify" my last post, again.Lol.
I'm replacing over 50 bolts, studs and nuts on the YZ125 engine as I'm getting my titanium order ready to a racing supply company.

This company also makes titanium wheels studs and lug nuts for very high horse power car companies Ferrari,  Lamborghini,  Mercedes, Porsche etc. Half the weight and stronger then the steel studs and nuts it's replacing.
The same grade 5 6AL4V titanium  product I'm buying.

Honda Race teams also run alot of titanium on their race bikes including cylinder base studs and cylinder head studs with nuts, exhaust  flange studs.....
Stuff is not that expensive either and can be bought in small batches or by the piece.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 08, 2019, 08:59:52 am
Took me a whole day yesterday to complete my titanium order through Amazon with 2 suppliers.
Order cost me C$70, shipping was free.
Only pieces I'm still looking for is four M10x60 lower cylinder base studs and nuts.

If you buy titanium be aware there's lots of junk out there. If it's not 6AL 4V grade 5 don't buy it.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 08, 2019, 12:07:51 pm
Amazon and Ebay are way to easy to spend your money.
But wow some good deals . I just ordered a NOS standard bore piston for my 1982 YZ engine. Not a scratch on it and the box still looks brand new. $7 USD plus $17 for shipping.
Tons of NOS STD vintage pistons on Ebay some as high as $120. Got mine out of Spokane, Wa.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 09, 2019, 01:39:52 pm
This morning I made a big decision on this bikesaw build and will not put a oil tank on it as I originally planned.
I got a hold of a chain lube which works better then anything I have previously used over the last 40 years.

There will be a small 1 ounce reservoir mounted under the top cover with a 2 inch line going directly to the bar pad. In my pocket I'll carry the lube in a 2 ounce squeeze bottle to fill the reservoir during warmup and lastly on stage before the cuts.
After testing in the spring the reservoir may not be needed, but there will still be a small inlet hole into the oil line on the top cover where I can  squeeze the lube to lubricate the b/c and drive sprocket.
 Not having a oil tank will definitely save alot more weight and making the saw even more compact.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 10, 2019, 12:11:03 pm
Another chain lube product I'll be testing came in the mail this morning. This stuff may be the cat's ass if it holds up and then there would be no need for pre lubricating the chain for warm up and making 3 cuts.
This stuff is not cheap but looks to have potential. 
The bar/chain and drive sprocket need to be degreased , rinsed throughly and dried before applying this product. The product is applied and left to dry overnight.
So I'll see how it holds up on the 066-28" in a 20" log with no bar oil in the tank with a dry oil pump.

Will have to wait for a few weeks,  just getting ready to head out on vacation to Charleston, South Carolina. 
At the moment getting new 20" Toyo tires installed on the diesel pickup. Will need them as we may have to drive tomorrow through a white out blizzard here in Manitoba. We gotta drive 472 miles (3/4 solid wilderness) to get to the city where we fly out  Saturday afternoon at 3pm.
May have to leave early Saturday if the #6 highway is shutdown tomorrow.
 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 10, 2019, 03:56:37 pm
This afternoon I tried this new dry on chain lube. Ran the little Husky T536 battery saw out of oil until the chain seized. Cleaned up the b/c and sprocket good and painted  on the lube.
Used the wife's hair dryer to dry it and put the saw in a 8 " log. I'm impressed,  cut about 20 cookies and she felt like it was cutting faster then normal with bar oil.
Started to get a little tight so I loosened the chain a smidgen and I finished the block of wood. If I followed the instructions better with over night drying I probably would have got better results.
Anyways wish this stuff was available 30 years ago, Lol.

This new nano technology is pretty mind blowing.
A diamond is today only the 7th strongest know material to man.
Graphene is #1 and some of these elements were only invented a few years ago.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on October 11, 2019, 08:34:36 am
Been using that dry lube stuff for about a year now for different uses. Tony in the chainsaw repair group turned me onto it.  Replaced my spray grease for certain uses.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 11, 2019, 10:18:46 am
I will test the wet stuff a bit more when I get back. I'm not throwing any brand names out there. Funny thing happened the other day that $7 piston I ordered that was on ebay for the longest time was sold to someone else shortly after I posted about it here. Got my money refunded.
Also the 1995 YZ250 engine that I quoted on her about a few pages back. It was sold later that night and it was for sale for quite a while prior.
On the highway at the moment heading south.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on October 12, 2019, 07:29:26 am
looks like you got to buy your good deals when you see them then post them up after they land in your lap
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 14, 2019, 05:57:01 pm
looks like you got to buy your good deals when you see them then post them up after they land in your lap
Yeah but I missed out on the YZ250 and lost the sale of the piston. But that's ok I bought another NOS STD piston.

Well I went from this and now to this in Charleston, SC. The USS Yorktown is a pretty amazing relic. My daughters thought so too.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on October 15, 2019, 11:28:51 am
You guys got that snow already?  I seen MT out NW been getting hammered too.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 15, 2019, 02:21:40 pm
You guys got that snow already?  I seen MT out NW been getting hammered too.
We got hammered Kevin. Not in my town up in northern Manitoba but in the southern part along with the Dakotas and further south...part of the Colorado low storm pattern.
Trees are still fully leafed and the heavy wet snow mixed with rain and high winds did major damage. State of emergency in most parts in southern Manitoba with thousands of power poles down and still no power in those areas along with below freezing temperatures.

Beautiful here in Charleston. 76° and cloudy.
Good day to tour the USS Yorktown and surrounding museums.
My wife took this picture of me and daughters on top of the carrier's runway.
Awesome tour!



Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 15, 2019, 03:53:53 pm
Just found this picture from back home.
Manitoba Hydro linesmen restoring power.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 23, 2019, 04:47:55 pm
Just a warning here to anyone interested in replacing all your hotsaw's steel bolts and fasteners with titanium.
I decided to go all the way with mine replacing everything....$368 USD.
I know what you're all thinking, Lol.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on October 23, 2019, 05:25:46 pm
Wow that is some cash for nuts and bolts, but it is about competition.   
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 23, 2019, 10:07:16 pm
Wow that is some cash for nuts and bolts, but it is about competition.   
If I could have ordered every piece from one or two suppliers I would have saved alot on shipping.
I was getting the stuff out of the US, Canada and the UK.
The 9 cylinder and head M10-M8 studs and nuts were expensive. Interesting the Honda CR250 shares the same cylinder base studs as my little yz125.
The suppliers claim 2.5 to 3.5 lbs can be saved on a bike engine with titanium.  Thats with transmission and hardware included.
Then the race bikes get right into the titanium brake calipers,  handle bars, foot pegs etc etc etc
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 27, 2019, 01:05:40 am
The mailman has been delivering ebay packages to my house every day last week.
On Friday he asked me "what are you building?" I said "Oh nothing " (not wanting to explain what a bike saw is) Lol
Today and yesterday are 2 big days in my life, on Ebay I made 3 separate orders. I found a near mint 1983 Honda CR250R 66.75mm cylinder in B.C.for $80 US and free shipping.
 A crankshaft to match in Ohio for $96 US shipping included and a complete 2 piece crankcase from Colorado for $69 US shipping included  One crankcase half had a hole in it in the transmission end, that will be cut off  Lol.
Grand total $245 US!

So I'm now committed to a CR250R bikesaw build and it's going to be fun.
 I'll send the cylinder and crank out to a builder in the western US. Get them to prep the cylinder with a fresh bore and  new piston Then do a 3rd stage porting job. 
Get them to replace the crank's con rod with a  billet rod, then  balance it.
Hopefully they can build me a cone pipe while their at it.
When I get everything back and put together I'll do the 3 pieces of solder on top of the piston and put the head on and spin the motor over to squish the solder. Send the head and solder to them and they can mill the head to the type of fuel I want to run.

The 1983 Honda CR250R was the birth year of the 18 year run of the strongest Honda 250's up to 2001. In fact the 1983 to 2001 CR250R share the same connecting rod part # ....pin,  washers and bearings included.
The 1983 CR250R was Honda's first year lightweight engine and still non power valve until being added in 1984.
The 1983 was rated at 45h.p. stock and the fastest with the best throttle response at the time getting to the first turn on the track.

Now your probably thinking why don't I just build a newer CR250 with more options for power.
Well the reason is this 1983 model engine has a right hand ignition just like my YZ125 and I'll build them both the same way with the cylinder leaning back , header pipe underneath with the carb pointing straight up. PVL analog bi rotational ignition reversing engine rotation to run the b/c in correct rotation on right hand drive.

Carbon fiber and titanium also.in the Honda build.
I'll post a few pics when I get everything on my bench in a few weeks
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on October 27, 2019, 11:46:29 am
Wife tells me I got to sell off some of my shelf queens.....
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 01, 2019, 03:35:20 pm
So after alot of research today I ordered this brand new Mikuni Super BN 38mm carb for the YZ125.
If the YZ can't handle it the Cr250r will definitely handle it.
If the little 125 can handle it then I'll get a 42mm Super BN for the Honda.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 02, 2019, 12:24:36 pm
As Ed Heard once said don't go too big of a carb because it can hurt you on the  cold start.
So a 42 mm on the Cr250r may be too big. So my second carb purchase may be a 34mm Mikuni Super BN for the125 and use the 38mm on the 250.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 08, 2019, 10:04:53 pm
Total shop time now! Done slaying trees until spring (April) :)
Got most of my parts etc delivered except carbs  gasket kits, bearings, pistons. Still waiting for some more titanium out of the UK.
I have enough carbon fiber to build both the YZ125 and the Honda CR250R. Going to run more stainless steel bolts in the 250 then titanium.
Pictures here shows the nice Honda CR250R parts I found and for cheap prices. The right hand ignition Honda will have the same profile as the YZ125 in the background along with the same reverse rotational PVL analog ignitions.
Light and compact for  cold start 3 cut  races. YZ125 with 18" b/c, CR250 will run 28".
The Honda won't be a 60 h.p. ESR/LED 330 bikesaw but with 50 plus horse it will handle a 18"-20" pine or poplar log just fine in a cold start race with a .404 high tooth chain and the right gearing.
The Mikuni jet ski carb I picked I found out were designed to work the best in down draft position,  perfect for my saws.
May buy another one of them which is factory built for methonal.
I'll have to make another post for the pictures....forgot to resize them.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 08, 2019, 10:13:09 pm
Here's the pics.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on November 09, 2019, 12:26:48 am
you are now starting to have some fun look forward to the build pics
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 09, 2019, 10:49:18 am
you are now starting to have some fun look forward to the build pics
Thanks Pete, more to come.
When I ordered some Brisk racing plugs from Jegs Performance I got a quick reality check when they sent their muscle car fall flyer catalog.
Pics here show some not bad prices but holy cow when would a guy stop spending money here, Lol.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 09, 2019, 01:21:39 pm
I used to have guys come down 89-92 time frame from Kitchener Ont.   We would drive down to Jegs and buy a van full of stuff. 
I then would write hand written receipts for the stuff to save them when crossing the border. Like they were coming from a flea market car show. ;)   I recall parts up there back then was 3 times the prices here.

I live between Jegs and Summit.   Been going to Jegs for close to 40 years.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 09, 2019, 01:32:48 pm
I used to have guys come down 89-92 time frame from Kitchener Ont.   We would drive down to Jegs and buy a van full of stuff. 
I then would write hand written receipts for the stuff to save them when crossing the border. Like they were coming from a flea market car show. ;)   I recall parts up there back then was 3 times the prices here.

I live between Jegs and Summit.   Been going to Jegs for close to 40 years.
I may have to call on you services one day Kevin but until then our low dollar will have to come back up to better value... alot.
It's nuts up here for performance prices, a quick drive across the US border fixes that , but make sure to be educated on the customs routine.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: Cut4fun . on November 09, 2019, 01:38:27 pm
About hour to hour half straight south depending on traffic.

1 of many Jegs cars. 

Summit has 2 pro stocks I know of.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 09, 2019, 01:51:48 pm
Awesome! If either company didn't have competition with each other they and the industry wouldn't be where it is today.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 11, 2019, 11:08:40 am
Everyone have a good Veterans Day in the US and Remberance Day in Canada.
My family and I pay our respects this afternoon at local Legion then everyone goes on a March with the vets, military and police force in the lead. -32 below this morning.

Here's some pics of my latest on my winter 1983 Honda CR250R / 1982 Yamaha YZ125 hotsaw project.
As the last pic shows the YZ125 will get its intake bridges removed and breathe as good as the CR250R to the right.
Both cylinders completely stock.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 11, 2019, 11:18:23 am
One more picture.
The little 1982 YZ125 cylinder on the left shows it's great breathing capabilities compared to the 1983 CR250R.
This vintage CR250R intake is basically unchanged up to 2001.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: 3000 FPS on November 11, 2019, 01:56:01 pm
I am so used to looking at the intakes of your typical chain saw cylinder that those intakes look gigantic.    I see your thumb in the picture so there is some reference to the size. 
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 11, 2019, 02:11:27 pm
I am so used to looking at the intakes of your typical chain saw cylinder that those intakes look gigantic.    I see your thumb in the picture so there is some reference to the size. 
Yes that's the reason why these Japanese engines put out so much horse power plus 10mm cylinder base studs  to hold them down.
I was quite surprised the little YZ125 was so close in size of intake compared to the CR250.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 14, 2019, 08:28:49 am
New Mikuni Super BN 38mm race gas carb is now in my hands, delivered all the way from Loudon, Tennessee.
Beautiful looking piece and unbelievably lightweight.
It's got a fuel tank return line fitting so the little YZ125 should handle it no problem as it did with the big Tilly HD.
One more exact carb to order for the CR250R later this winter which will be the factory setup alcohol version.
The gas carb can fully purge either saw of the Alky out properly. Might be a PITA but worth it for longevity.
Here's the pics.


Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 15, 2019, 10:25:06 am
Well the new SBN bolts up nicely to the homemade Tilly HR manifold (60 mm stud centers).
But won't know if the 125 can handle it until I get her all back together.
Looks a little overwhelming perched up there. Hehe.
Eventually going to a lighter thinner intake for better top end



Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 21, 2019, 02:18:15 pm
I made my decision on the drive sprocket setup for the YZ125 bikesaw.
I can buy a CNC billet sprocket with built in hub flange but they are heavy, I definitely will put one on the bigger CR250R but for the little YZ125 it defeats my lightening purpose.

So I just happened to find this NOS Sandvik 12T .404 .063 harvester sprocket on Ebay and also this 73mm x 30mm chunk of GR5 titanium for $20 out of Israel of all places!
Now I got the chore of finding a machinist who can make this titanium into a hub adapter for the sprocket and rope spool.

12T .404 is equal in diameter to a 13T .375
I always ran a 11T .375 on the YZ but always wanted to upgrade to a 13T for the "18 fat belly .050 bar.
Plans are to put 46RST HT cutters on a Oregon 50AL .404 .050" chassis.
Originally thought about a high tooth .375 with Stihl 33 Topic Super chassis but I think risk of snapping it would be high .
Here's the pics.



Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on November 21, 2019, 02:24:29 pm
Forgot to add this picture.  The Sandvik rsc-12 advertised as a .063 not .080 is correct.
The tape measure in this pic does show the DL slots are .063 (1/16" approx) with .077 oversize allowance. Any rim sprocket is .063 with .077" true measurement.
A .080 harvester chain/rim would need a measurement of close to .100"
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 15, 2019, 07:30:38 pm
The YZ125 and CR250R are starting to take shape.
Carbon fiber sideplates attached with titanium fasteners. Now lots of sanding and shaping to get the rear handles just right

Friend of mine who makes custom knives wants to make some tropical wood pistol grips for the two saws.
Top handle balanced profile will be cut out when both saws are fully assembled with b/c installed and fuel/oil tanks filled .
Here's some pics.

.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on December 16, 2019, 06:13:58 am
looking good you are not wasting your winter time
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 16, 2019, 06:38:15 am
Pete, it's been -30F here for the last week and will see -40 by this weekend. Nice to be working indoors at the work bench.
25 years ago working cut and skid I had to put in 8 hours a day in those temps, I like indoors better.. haha.
Last night started on the fuel tanks.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on December 17, 2019, 02:03:40 am
we are looking at plus 40 celsius for next few days no fun at all
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 17, 2019, 07:45:17 am
we are looking at plus 40 celsius for next few days no fun at all
Pete, we share opposite winters and summers with the same 40 degrees. We don't get very much +40C but you can be thankful to never get -40C. Hahaha.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on December 18, 2019, 02:06:54 am
yes your minus 40  I can do without
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 25, 2019, 08:56:31 pm
Merry Christmas everyone!
Look what Santa brought me.
This is the future...CNC robotics.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on December 28, 2019, 08:11:31 pm
So Smooooooooooth if that was the finish on it twenty years ago it would only be because of a lot of hand work now with the modern machines its like make it bung it on the saw or bike as its ready to go
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on December 28, 2019, 11:44:07 pm
So Smooooooooooth if that was the finish on it twenty years ago it would only be because of a lot of hand work now with the modern machines its like make it bung it on the saw or bike as its ready to go

Yes it's pretty amazing technology alright?
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 15, 2020, 12:25:31 pm
I made my decision on the drive sprocket setup for the YZ125 bikesaw.
I can buy a CNC billet sprocket with built in hub flange but they are heavy, I definitely will put one on the bigger CR250R but for the little YZ125 it defeats my lightening purpose.

So I just happened to find this NOS Sandvik 12T .404 .063 harvester sprocket on Ebay and also this 73mm x 30mm chunk of GR5 titanium for $20 out of Israel of all places!
Now I got the chore of finding a machinist who can make this titanium into a hub adapter for the sprocket and rope spool.

12T .404 is equal in diameter to a 13T .375
I always ran a 11T .375 on the YZ but always wanted to upgrade to a 13T for the "18 fat belly .050 bar.
Plans are to put 46RST HT cutters on a Oregon 50AL .404 .050" chassis.
Originally thought about a high tooth .375 with Stihl 33 Topic Super chassis but I think risk of snapping it would be high .
Here's the pics.




So on the continuing saga about my harvester rim sprocket for the YZ125 bikesaw(for those interested in building one for their hotsaw)
The ebay vendor sent the wrong one that I ordered but then it turned out it was the one I should be using.
They sent me the one I ordered and I was told to keep both.
On comparing the two one is a .063" and the other on the right is a .080".
So the first one they sent me the
.063 I will use for my .050/.404 chain.
The titanium piece came from Israel and when I showed it to my machinist he said no problem putting it on the lathe and making a sprocket hub adapter and rope spool.

Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on January 17, 2020, 06:15:31 pm
The Luck of the Irish must be riding with you order the one you think is right they send you the wrong one which is right and you get your original order of the wrong one  which you thought was right thrown in for Nix this is gonna be a lucky saw  i would paint a shamrock on it
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 17, 2020, 06:48:57 pm
The Luck of the Irish must be riding with you order the one you think is right they send you the wrong one which is right and you get your original order of the wrong one  which you thought was right thrown in for Nix this is gonna be a lucky saw  i would paint a shamrock on it

Thanks Pete. I am 50% Irish and I do have a very good feeling on the out come of these 2 saws.
The 125 Yamaha will be a little banshee and the bigger 250 Honda will be more of a lugger, as long as I keep exhaust duration under 190°.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: pete on January 21, 2020, 07:08:23 am
I dont understand a lot of the technical stuff about your saw builds but I do enjoy the creativity and the actual builds they to me are like sculptures and works of art A weird way to describe your work just my way of looking at them great stuff and I am enjoying following the progress cheers
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 21, 2020, 09:21:11 am
Pete, sculptures is a good point. Maybe my years of chainsaw sculpturing logs can be related.
To build something from scratch I think takes a vision of the end result before even starting to build the project.
Title: Re: HolmenTree Bikesaw Resurrection
Post by: HolmenTree on January 22, 2022, 09:46:37 am
Hello guys, I forgot about this thread probably due to FB, Lol. So time to update.

This Covid era now going into the 3rd year has definitely been a positive for projects in the saw shed.
Besides the 1982 YZ125 and 1983 CR250R I have added a third bikesaw project,  a 1984 CR500R.
I got everything covered now regardless of cc class.

The 500 is being built primarily for the 27"-33" wood single cut hot start  events which appear to gaining more attention lately after going idle for a decade or so. Big concern for competitors is the extra torque and wood size breaking chains making very dangerous projectiles around a gathered audience.

Going well past 2 years now with the R&D and part gathering of my projects but I don't just hap hazardily slap something together,  more like a focused OCD type of style I like doing.
I'm enjoying the moments ;D

This early spring the saws will be in the wood testing for summer's competitions.
The CR500R may be a bit later, but not by much.
Now to post some pics but first I'll see if they are small enough to post. If not I'll post in the next post.