Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: brokenbudget on April 05, 2013, 09:28:56 pm


Title: dolmar 5105
Post by: brokenbudget on April 05, 2013, 09:28:56 pm
i've had this dolmar 5105 sitting on the shelf for a little while, bought it new last summer.
once i have a couple more projects cleared up, i wouldn't mind going into it.
so i've heard that there is another piston that can be used, with wider skirts. what piston and what am i looking at to get it to fit properly? not looking to go extremely wide on the ports, but i do want a little more meat on the skirt. for the first go 'round, i won't be doing any timing changes, just make things flow better, unless somebody has some good numbers they would share either here or in pm's. i'm not somebody that goes around giving out info given in confidence ;). keep in mind this saw will be used as a chainsaw.
any hints that pertain to the 5105?
Title: Re: dolmar 5105
Post by: 660magnum on April 05, 2013, 10:19:28 pm
They run pretty good the way they are. Mine is a early one. I removed the 20" X regular 3/8" bar and put a 16" X regular 3/8" bar on it. I also removed the catalytic muffler and replaced it with a 5100 muffler. You might not notice it was changed unless mighty familiar with 5105's.
Title: Re: dolmar 5105
Post by: brokenbudget on April 05, 2013, 10:35:15 pm
 :) already have the 5100 muffler on it. and that did make a good difference. barely 3 tanks of fuel through it. and they do run well stock. but i know there is more in there. :)
Title: Re: dolmar 5105
Post by: 660magnum on April 05, 2013, 10:35:34 pm
Stumpy did one last fall. He used the stock piston. Marked his skirt limits on the cylinder

Stock
ex 140
tr 100
in 142
Squish .030"

ported
ex 144
tr 108
in 166
Squish .024"
Title: Re: dolmar 5105
Post by: 660magnum on April 05, 2013, 10:39:25 pm
http://www.youtube.com/watch?v=1i1mBPMVsKA

http://www.youtube.com/watch?v=oFGe4k_07Sw
Title: Re: dolmar 5105
Post by: brokenbudget on April 05, 2013, 10:40:33 pm
hmm, going to have to look for his post on it. missed that one "over there".
thanks for the starting point! :)
Title: Re: dolmar 5105
Post by: farmboy on April 06, 2013, 10:53:35 am
A Husky 45mm 51 piston works in 510-5100-5105. Husky 353 45mm should work too.  Iknow the 51 does.  Haven't seen a 353.   Cut windows and trim skirts. 

Shep
Title: Re: dolmar 5105
Post by: brokenbudget on April 06, 2013, 11:01:21 am
A Husky 45mm 51 piston works in 510-5100-5105.  Cut windows and trim skirts. 

Shep
i have to get rid of this tooth in my head first. ;D started to ache yesterday morning but now it's at full blown scream >:(
i can't remember if that was the piston or not. can't remember where i heard what i seen :)
can't even think straight right now. hydromorphone kicking in but no relief.
bluh bluh bluh bluh :)
stupid tooth aches.
i think it might have been ehp that was putting a different piston in the 5100/5's
does he post here?
Title: Re: dolmar 5105
Post by: farmboy on April 06, 2013, 11:23:29 am
I empathize on the toothache :'( . I'm pretty dang tough and I've never had anything bust me like a toothache.  Was in Fla when it hit on a weekend too.  Dang near OD'd on Ibufrofen trying to get some relief.  Wife said I was babbling incoherently on the trip home.
Yes ED does post here.
Shep
Title: Re: dolmar 5105
Post by: brokenbudget on April 06, 2013, 11:41:26 am
 :)lost a chunk from between 2 teeth a couple days ago while flossing. felt something moving around in there the floss couldn't get rid of so i broke out the water pik. blew a piece out half the size of a 3 year olds finger nail. went in to the emergency dentist (no pain at that time), she says it's infected and i need to wait until that clears up with antibiotics. say i'll need the hydromorphin when the tooth starts to dry out. boy was she right. it's kicking in good now, i can still feel it, but it's so far down there it feels like heaven right now.
i find it funny how a tooth ache needs to make my ass cheek feel like it was ripped off ;D i swear, my whole left side hurts like i have bad teeth all over.

thanks shep! i did see he was posting on here. just need all the guidance on this one. if there is any benefit to it in a work saw. :)
Title: Re: dolmar 5105
Post by: 660magnum on April 06, 2013, 01:07:19 pm
Hope you get to feeling better soon.
Title: Re: dolmar 5105
Post by: brokenbudget on April 06, 2013, 02:16:17 pm
Hope you get to feeling better soon.

thanks 660, that makes 2 of us :)
Title: Re: dolmar 5105
Post by: farmboy on April 07, 2013, 05:55:41 am
Send EHP a PM about piston may be faster than waiting to see if he finds this thread.  If you do I'd be interested in a possible piston choice.  He has a site ehpsaws.com.
Shep
Title: Re: dolmar 5105
Post by: brokenbudget on April 07, 2013, 06:09:31 am
yeah i'm a member at his site aswell, just don't post much because it takes way to long to load :)
not in a huge rush, gotta get this monster outta muh head. antibiotics aren't doing much. niether is the hydromorphin
Title: Re: dolmar 5105
Post by: SawTroll on April 12, 2013, 06:44:38 am
I assume the 5105 is fine, if you want a heavy 50cc saw, that handles like a brick... ;)
Title: Re: dolmar 5105
Post by: brokenbudget on April 12, 2013, 08:15:14 am
tell you what troll. you know what i don't like about the high horsed husky 346/ jonny 2153? they DO NOT make torque like the 5100/5105. they are peaky, cheap feeling and the antivibe might aswell not be there as it doesn't do anything it's supposed to.
quite honestly, the only one thing the 346 has over the dolly is the throttle response. nothing else.
you need to understand that a little extra weight will help with the vibrations, also helps when you have a properly designed antivibe system, which husqvarna has totally missed the boat on. even the 555-562's could use a better spring system they're sent out the door with.
seems the only complaint you can come up with is the husky is lighter and has quicker throttle response. how does this affect the regular firewod guy blocking wood in his yard?
maybe husqvarna should be trying to come up with a better plastic that doesn't fade, crack, break and wear prematurely, you know, maybe a little more quality for the long run, instead of trying to win the throttle response race.
then again. maybe some people need to go and do some weight training if they're going to complain about a weight difference they can't feel while holding the 2 saws side by side.
the 346 is narrower. i'll give it that. but it certianly isn't worth the extra money they ask for it. i'd sooner just cut the tree slightly higher off the ground.
everything equal. i'd still pick the 5105 over the 346. the 346 feels like a chinese kids toy.
Title: Re: dolmar 5105
Post by: brokenbudget on April 12, 2013, 08:18:52 am
besides that, the 346 is an old obsolete relic destined for the old shed where all the other prematurely worn out huskies are stored ;)
Title: Re: dolmar 5105
Post by: farmboy on April 12, 2013, 08:36:27 am
I'm with you!!!  I have 1-346NE and 8-5100's(3-NIB) and a old "Tank" 510.  I never use the 346 guess I ought to sell it.  Much prefer the Dolmars.  Then the Big Dolmars 6401/7900, 2-6401/8401BBK's, Solo 681.  On the Husky "handling" factor the Husky 242/246 beat the 346 IMB.  Handling is determined by the user.  I've had 346 guys (10 years running 346's) say my 5100s handle better. 
Shep
Title: Re: dolmar 5105
Post by: EHP on August 12, 2013, 12:55:04 pm
Sorry guys I never looked here , first NO I never put a different piston in the 5100/5105 and honestly never looked for one , You can just use the stock piston and make very good gains , I have put pop ups in them and had good luck with them and cut the piston above the ring done as low as .090 left and piston never broke and it had the **** run out of it cutting firewood and I mean hundreds of tanks of fuel , Like any dolmar you have to watch how you port these motors and the 5100/5105 seem to be the worse at this , if you over port the transfers you will end up with a saw that has no balls at all and it boils the gas in the crankcase , with their small volume crankcase and larger transfers it just pulls to hard and creates way to much heat in the case  so do not be putting husky 346 porting numbers in a 5100 or you will have a gut bucket of a saw , One thing thou is this saw does like having the flywheel advanced
Title: Re: dolmar 5105
Post by: brokenbudget on August 12, 2013, 04:23:49 pm
awesome info ed! thank you very much! i have no idea where i heard about switching pistons out. it was a while ago. i actualy haven't even checked the squish on this one yet :) figure all i'll be doing is getting that in order and just smoothing everything out to flow better. i don't really want to mess with changing any numbers as of yet.
what about the muffler? i've heard too many back and forths on this to make you car sick. one will say there's no gains to be had and the other will swear the saw will turn into a light sabre :D i already have the non cat muffler on it, and it did make a big improvement. but it's a still 'stock'.
Title: Re: dolmar 5105
Post by: EHP on August 12, 2013, 05:47:30 pm
it will gain power with a muffler mod , just donot go crazy on making the opening huge like on a husky , what your doing is what I see alot of so calling modders are doing and that is tighten the squish up but donot report the ports , yes tightening up the squish will gain you torque but because you lowered the transfer and ext port you will make the torque at a lower rpm in the wood , Raise your ports back up and you will gain torque and raise your in the wood rpms , On a 5100 running a 16 inch bar and 3/8's chain with you pushing some you should hold at least a 12,000 rpms in the wood , 12,400 or 12,500 is what I shoot for on a woodsport job , These saws pull pretty good and are nice and light and easy to operate , When I do vidoes I donot let the saw sit there are scream , ya it might sound good but it ain't cutting **** so how do you know what the hell the motor has for power , I know myself I would far sooner see a 10 sec cut where the motor has to work compared to a 15 second scream that really shows nothing . Like I said before yes you raise the transfers but donot go wild on them or you will have a door  stop  ;D
Title: Re: dolmar 5105
Post by: brokenbudget on August 12, 2013, 06:12:55 pm
thanks ed! loud and clear! 8)  that's the info i was looking for! :)
Title: Re: dolmar 5105
Post by: Old Iron Logging on August 12, 2013, 07:48:24 pm
Listen to Ed on the 5100. Had him port one for me when they came out. Used it hard for a winter cutting 16-24 inch hardwood. Was using a 7900 before. Never used the 7900 again.
Title: Re: dolmar 5105
Post by: EHP on August 13, 2013, 04:43:43 pm
as far as heat goes in the motor you can push the 5100/5105  pretty good before they give up , I know most hate this but always run lots of oil in your gas and from what I have been seeing for years is the crank bearing just last longer , On my stock or some what stock motors I run 40-1 and on my hotter ported motors I run 32-1 , I have a couple real hot motors and run 20-1 in them .

Dolmar to me is the most misunderstood motor out there and I'm not really sure why cause I find them 1 of the easiest to get good power out of , I can port a 7900 in less time than I think any other saw and some saws take double the time to do the engine work, The biggest mistake I have seen lots of times is guys try porting the 7900 using 372 porting numbers and that will not work at all , If you raise the transfers up to 372 porting numbers you better be running on alcohol cause it will not make enough power on gas to cut a broom handle , It will sound mean until you hit the wood , so you better just fire it up and talk about how fast it is and make sure you donot show anyone  ;D