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025 Cylinder Rebuild Kit

Discussion in 'Chainsaw' started by Kenskip1, Aug 26, 2019.

  1. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    Well I guess the title says it all.My 025 seems a bit low on compression. Cold it is 125 psi.Can someone recommend a aftermarket kit to freshen up the old girl? I have read some good things about Meteor. Any suggestions? Thanks, Ken
     
  2. Mad Professor

    Mad Professor Addicted to ArboristSite

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    If P/C is within tolerance just put in some rings
     
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  3. redunshee

    redunshee Addicted to ArboristSite

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    Squirt a little oilin the cylinder and redo comp. If it jumps up odds are new rings are needed.
     
  4. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    If I could find out the size of the cylinder I might use the rings bearings and seals. However I asked my local dealer the size of the piston and they are unsure. 42mm 0r 42.5mm. On the handle it states 44cc. I looked at the piston through the muffler and it looks near perfect.So I guess without tearing it apart it is a guessing game. This is why I asked about the cylinder kit. I would have all the bases covered this way.Ken
     
  5. brad ruch

    brad ruch ArboristSite Guru

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    Could be either I'm guessing depends on serial number year made.they made them in 42mm and 42.5mm check your in box.

    Sent from my Pixel 2 XL using Tapatalk
     
  6. Mad Professor

    Mad Professor Addicted to ArboristSite

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    Caber has what you want: 42.5mm, 1.2mm width, style G15H

    not sure of 42mm variant? Check piston with calipers. Caber has 42mm ring sets

    http://www.caberpistonrings.com/eng/cataloghi.php?sez=gardening

    stihl gasket kit will come with new crank seals.

    $tihl is quite proud of their ring$ like their P/C set$

    Might want to get some new rubbers, only cheap $#@!ers use/reuse used rubbers.
     
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  7. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    I am stihl using the saw.I had saw at dealer this morning. We looked for numbers on the cylinder that could give an indication to the piston size. No dice.
     
  8. Mad Professor

    Mad Professor Addicted to ArboristSite

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    Have dealer look up serial number stamped on case near top of bar cover.

    Or take off muffler and do the plastic straw in the ex port measurement. Will need to be careful on that to get +/- 0.5mm

    Don't buy a POS aftermarket P/C kit if your much better quality OEM is still in good shape.

    If dealer can't figure out rings, they are useful as teats on a bull.

    P.S. is the saw a weak sister when pulling recoil? or maybe the comp gauge you used is not accurate?
     
  9. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    Mad, I had the saw to the dealer this morning. He looked at the numbers but was unable to make a definitive decision. Here are the results of a compression test that I did just now.I have two gauges 20190827_145914[1].jpg 20190827_150305[1].jpg . On is off compared to the other.
     
  10. redunshee

    redunshee Addicted to ArboristSite

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    Can you check another saw? 150 sounds about right.
     
  11. redunshee

    redunshee Addicted to ArboristSite

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    Can you check another saw? 150 sounds about right.
     
  12. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    OK Rob,, Here is my Husky 51 As you can see there is a sizable difference One says 160 the other says about 185. I do not really know what gauge is right BTW, The throttle was tie wrapped to the full open position. 20190827_162408[1].jpg 20190827_162639[1].jpg
     
  13. Mad Professor

    Mad Professor Addicted to ArboristSite

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    I think 155 psi is fine, don't chase windmills.

    Lets see your P/C through ex port.

    Worst case seems you might need rings. I'd run it until then , and take care of filters, mix.

    Compression testers can be all over the world. Some are not made for saws and/or don't have right adapters.

    If dealer will let you, try yours on a couple of new saws.

    P.S. if he won't, then tell him he might have lost a sale........he'll be back, as quick as the runs, after a gallon of hard cider.
     
  14. Kenskip1

    Kenskip1 Addicted to ArboristSite

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    Thanks for the words of wisdom.Don't worry. I told this dealer that I will never buy a saw from him or a Husky dealer for that matter.Anyway the piston is in showroom condition.Not a mark on it.Yes it might need rings, but what size? I used my RCBS mic going inside the piston through the exhaust port. Forget that idea. So this is why I asked about cylinder kits.42.5 MM will bolt right onto either the 42 or 42.5 MM saw. Can you see my point?
     
  15. huskihl

    huskihl Addicted to ArboristSite

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    The 44cc model is 42mm bore. The 45cc model is 42.5mm bore
     
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