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346xp compression

Discussion in 'Chainsaw' started by pwoller, Jul 15, 2011.

  1. pwoller

    pwoller AboristSite Guru

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    I just bought a new to me 346xp made in 2010. Do these saws have low compression compared to most other saws? I tore it down to see if it was scored up but the piston cylinder and ring look perfect. Granted my other 2 saws are a 3120 and a 2100cd both have tremendous compression so those are what I'm comparing them to.
     
  2. HiOctane

    HiOctane Addicted to ArboristSite

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    Check with a gauge,should be min 125.Decompressor valve could be leaking if you got one.Check ring gap,has to be less than .025.And much much easier to pull than a 3120.
     
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  3. nmurph

    nmurph ArboristSite.com Sponsor

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    Comparing the "feel" of compression on a 50cc and 100cc saw is like comparing apples and puppy dogs......Stock compression is about 155psi. Unless that saw has a lot of hours, I doubt there is anything wrong with it and you will be fine with it.
     
  4. SawTroll

    SawTroll Information Collector

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    I'd say 125 is pretty low on a 2010 saw, but guess it would still run.
     
  5. ELECT6845

    ELECT6845 Addicted to ArboristSite

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    346xp

    Bring it down to the house paul and ill help you check it out. Plus ive always wanted to run a 346xp.
     
  6. HiOctane

    HiOctane Addicted to ArboristSite

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    At 125,she would still start but best number is around 150.
     
  7. SawTroll

    SawTroll Information Collector

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    Yep! :biggrin:
     
  8. pwoller

    pwoller AboristSite Guru

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    Thanks for all the help guys. I figured it was just because I was used to pulling on the big saws. I'll have to hok it up to the guage and see what it reads after I do some mods on it. Anyone dropping the cylinder gasket? If so what are you replacing it with?
     
  9. pwoller

    pwoller AboristSite Guru

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    I have to tweek it first but we could make the trip. I'll bring the big boys too.
     
  10. SawTroll

    SawTroll Information Collector

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    It is best to just replace the decomp valve with the plug Husky offer, or just not use it. It hasn't been depressed a single time on either my 346 or 2153, and never will be - I have one of those plugs, but am in no hurry to use it - maybe on the ol' 353, since the decomp on that one has been used (didn't know better at the time).
     
  11. nmurph

    nmurph ArboristSite.com Sponsor

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    Yep........everyone I own....mostly an aluminum can, but some have needed something thicker. The can usually produces a squish of about .017-018. I have also used gasket paper for a little more space and coat it with Yamabond.
     
  12. SawTroll

    SawTroll Information Collector

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    You may have to adjust the porting to fit, and make sure the piston doesn't hit the top of the cylinder.....
     
  13. TermiteBuffet

    TermiteBuffet ArboristSite Operative

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    My 346xp seems really easy to spin , don't know why they put comp release on it. It's still fairly new though only about 20 tanks thru it.
     
  14. SawTroll

    SawTroll Information Collector

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    It is not needed, and probably is there just because it is on most of the competition - just leave it alone, or plug it!
     
  15. nmurph

    nmurph ArboristSite.com Sponsor

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    It is probably pretty well seated now. They seem to gain about 5psi as they break in.
     
  16. gink595

    gink595 Banned

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    Put one of these in it, you'll make some compression.:laugh:

    [​IMG]
     
  17. pwoller

    pwoller AboristSite Guru

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    Yes please where would I get one of those? I need a pipe too. I dropped the cylinder down to .030 squish. Could of gone gasketless but thought I'd take it slow. I'll run it tomorrow and the tear it down again and port the #### out of it.
     
    Last edited: Jul 16, 2011
  18. Andyshine77

    Andyshine77 Addicted to ArboristSite

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    Out of the box I've see 136 psi and they run awesome, compression isn't everything.
     
  19. ncfarmboy

    ncfarmboy Addicted to ArboristSite

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    Run .018-.020 on squish. ThreeBond 1194 or Yamabond for gasket.
    Shep
     

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