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how to tell a good 039 stihl

Discussion in 'Chainsaw' started by drecker, Aug 24, 2009.

  1. drecker

    drecker ArboristSite Lurker

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    im looking at buying an used 039 from an older guy i know. low hours. seems to run fine. disappointed on power though. dont think it mechanical just underpowered. looking through exhaust and intake port the piston is free from scratches. though there is dark band of build up just under the ring. like dark lacquer. there seems to be more then normal ash and carbon build up in the exhaust port. the guy always used 10% ethenal gas 89 octane with stihl oil. i have the saw for a week to decide. what should i look for in the saw. lets here some opinions on stihl oil. any good. should you run a little sea foam in the gas. maybe do a before and after picture. how much it cleaned up. for sure its going to need exhaust mod. any good instruction and pictures on that

    thanks
     
  2. wigglesworth

    wigglesworth Booned

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    I would make sure the carb is set right first thing. If you are unfamiliar with it, take it to the local stihl dealer and let him adjust the carb. That is likely where the "underpowered" problem is coming from.
     
  3. Jonsered2095

    Jonsered2095 AboristSite Guru

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    And check the ring(s) is free; not stuck/sticking from running too rich.
     
  4. spacemule

    spacemule The Peanut Gallery

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    And make sure you have a sharp chain.
     
  5. Spitzer

    Spitzer ArboristSite Operative

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    IMO, regular dino stihl oil is dirty stuff.
     
  6. HittinSteel

    HittinSteel Addicted to ArboristSite

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    Having recently bought and sold one with a similar story, I would do it again. The muffler mod is very simple on that saw and makes a huge difference (send me a PM and I can give you some guidance). If another one comes along for the right price I'll be buying again........ unless I can find an 044 somewhere :chainsaw:
     
    Last edited: Aug 25, 2009
    matt9923 likes this.
  7. jmemmert

    jmemmert ArboristSite Member

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    dark colored under the ring means blow by (poorly seated rings)
     
  8. WidowMaker

    WidowMaker Addicted to ArboristSite

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    Do asearch for 039, 390 muffler mod. there are tons of post with pictures here...
     
  9. matt9923

    matt9923 Stihl bustin knuckles

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    underpowered huh.
    check compression, and check carb settings.

    put the H & L screw in all the way, lightly seated then turn them both out 1 turn.
     
    Last edited: Aug 25, 2009
  10. Saw Dr.

    Saw Dr. Junk Collector

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    True, but a little discoloration is normal. Pics would help here.

    How good of a deal are you getting? I am one of the few on here who not only likes the 029/039 series, but enjoys working on them. Even if the rings are worn, you can change then out for very little $. You just need a bit of patience, and a manual to help guide you through the process. A broken in 039 should have at least 140 PSI if it is in good condition inside. You'll need to listen for piston slap if the rings are worn. Many times they occur together.
    A muffler mod will REALLY wake that saw up. The stock outlet on the muffler is barely bigger than the end of a pencil, and the saw is almost 70cc displacement.
     
  11. drecker

    drecker ArboristSite Lurker

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    thanks guys

    its turned out to be a good saw. over 15 gallons of 92 octane with black bottle sthil oil. orange is crap. great cheap saw still coould use more power. im was just use to using o46 mag.
     
  12. matt9923

    matt9923 Stihl bustin knuckles

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    I love my 039, it owes me nothing. Still has good compression and power and has never been rebuilt. Maybe this winter ill de-carbon it form the years of #### oil and throw in some new rings.
     
  13. GASoline71

    GASoline71 Mr. Nice Guy (Moderator)

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    You got that backwards mang... sorry but Orange is good stuff... :) If you are usin' the black bottle "Low Smoke" oil... that is crap.

    Run the white bottle Ultra... 50:1. Best oil out there.

    Gary
     
  14. matt9923

    matt9923 Stihl bustin knuckles

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    sure is!
     

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