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MS310 piston & cylinder replacement?

Discussion in 'Chainsaw' started by agarb, Apr 18, 2012.

  1. agarb

    agarb ArboristSite Lurker

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    I have a MS310 with a scored piston and cylinder. How do I determine what can be re-used and what needs replaced? Can the piston & cylinder be reused if buffed out and rings replaced? All the scoring is on the exhaust side.

    I didn't know about the trick of shoving rope in above the piston before breaking loose the clutch so I put a wrench in the exhaust port. This has created a small burr on the piston and top of exhaust port. (visible in photos)

    Advice appreciated!
     
  2. Fish

    Fish Account Hold

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    Most of the time you can salvage the cylinder, but in this case, I would say you need both. And a different approach on assembly.....
     
  3. Roanoker494

    Roanoker494 Addicted to ArboristSite

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    May be able to smooth the port damage out but I would just replace the whole deal myself. Might as well go ahead and make it a MS390 while you are at it........
    039 Piston & Cylinder for Stihl -- 49mm (fits 039 MS390 029 MS310 MS290) | eBay

    There are always tons of 280/310/390 parts on Ebay, even some complete long blocks that only need bolted onto place.
    STIHL MS390 039 64CC COMPLETE NEW ENGINE! | eBay

    There are also complete parts saws available, though I am always concerned that they could end up being scored themselves.
    Stihl MS310 chainsaw runs great - ms200 020 av 028 042 038 | eBay
     
  4. sefh3

    sefh3 Addicted to ArboristSite

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    Ouch!!! It looks like it was caught in time until you damaged the cylinder. Read my signature, there are a few posts that will assist you in assembly of this unit.
     
  5. agarb

    agarb ArboristSite Lurker

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    Yes, I'm kicking myself for sticking that wrench in there! The local shop wanted $350 to rebuild it (more than what I paid for the saw) and I decided to give it a shot myself.

    Roanoker494 (My wife's from R Mount!) - Are those non-oem kits on ebay any good? Have you used any of them? Going up in size to a 49mm piston sounds good, but would anything else need changed? Carb, etc?

    What about one of the cheaper 46mm kits listed on ebay? Anyone ever used one of those? One seller has P&C kit for about $50.
     
  6. sefh3

    sefh3 Addicted to ArboristSite

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  7. mp5n

    mp5n ArboristSite Operative

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    Motor updrade

    I have a very low hour MS390 motor I don't need. To make a long story short, a tree fell on it and destroyed everything except the motor. This will swap out and give you a larger more powerful motor. If you're interested PM me.

    Regards,
    MP5N
     
  8. 1969cj-5

    1969cj-5 ArboristSite Member

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    I will take the sloppy seconds if the original poster does not want it.
     
  9. nstueve

    nstueve Makita Freak!

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    If you are going to use a aftermarket kit go to northwoods saw and get a aftermarket kit from them... they don't sell JUNK! i got an AM cylinder from ebay only to have nothing but pitting and voids in the casting everywhere. Northwoodsaw sells good aftermarket parts... At least i have yet to get a bad one from them. Plus you can get the oil seals, liquid sealer, and a piston stop for about $100-$120 for all of it. read the pm I sent you too.

    the 49mm top end is a direct swap and you need to pull the limiter caps and retune the carb is all... No other changes! You should be doing that for reliability reasons anyhow :)

    http://www.northwoodsaw.com/store/
     
    Last edited: May 3, 2012
  10. splitpost

    splitpost *********

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    i have used the AM 029 kit when my 310 was too far gone but the baileys 390 kit looks to be the best value around,drop it in and go:msp_thumbsup:
     
  11. 1969cj-5

    1969cj-5 ArboristSite Member

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    I just recieved my Northwoods kit today. My review will be forthcoming.
     
  12. Stihlofadeal64

    Stihlofadeal64 Addicted to ArboristSite

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    We will be waiting your pictures and comments
    :popcorn:
     
  13. 1969cj-5

    1969cj-5 ArboristSite Member

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    No pics yet, I have not messed with it much. I have been busy mowing and getting the garden finished. I did pull it out of the box to look at it. Anybody have a 390 Maintenance manual? I am going to need to get this done by somebody otherwise. I can not figure how to get the thing torn down. Then again, my technical skill level is close to "dissasembles very well" as opposed to anything else.
     
  14. Dan_IN_MN

    Dan_IN_MN Addicted to ArboristSite

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    Check out the link in my sig. PM sent.
     
  15. Applehead

    Applehead ArboristSite Operative

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    [​IMG]
    I wish I had found this yesterday.. who knew you need to take the flywheel n clutch off . :dont-know:
     
  16. sefh3

    sefh3 Addicted to ArboristSite

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    I have a few links in my signature line. Try em and see if they help. If not, ask away.
     
  17. Dan_IN_MN

    Dan_IN_MN Addicted to ArboristSite

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    Just an fyi...... the MS290, 310,& 390 are the same design.......just a larger P/C
     

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