Author Topic: HolmenTree Bikesaw Resurrection  (Read 1503 times)

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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #210 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



Making a living with a saw since age 16.
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #211 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.



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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #212 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"
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #213 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.

.
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Offline pete

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Re: HolmenTree Bikesaw Resurrection
« Reply #214 on: December 16, 2019, 06:13:58 am »
looking good you are not wasting your winter time
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #215 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.
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Offline pete

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Re: HolmenTree Bikesaw Resurrection
« Reply #216 on: December 17, 2019, 02:03:40 am »
we are looking at plus 40 celsius for next few days no fun at all
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #217 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.
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Offline pete

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Re: HolmenTree Bikesaw Resurrection
« Reply #218 on: December 18, 2019, 02:06:54 am »
yes your minus 40  I can do without
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Offline HolmenTree

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Re: HolmenTree Bikesaw Resurrection
« Reply #219 on: December 25, 2019, 08:56:31 pm »
Merry Christmas everyone!
Look what Santa brought me.
This is the future...CNC robotics.

Making a living with a saw since age 16.
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