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Stihl saw will not run at full throttle

Discussion in 'Chainsaw' started by pinmakers, Jul 26, 2006.

  1. pinmakers

    pinmakers ArboristSite Lurker

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    Hi All, have a stihl 031av saw that will idle fine and I can adjust the L screw fine per madsens web sit. When I give it throttle, the saw bogs down and will either run like it needs more fuel (sort of bucks and kicks) or will die. if I let off the throttle it goes back to idle. Cleaned the carb, fresh fuel, good spark, muffler ok. Can anyone give me some more suggestions? Thanks, Bart
     
  2. CaseyForrest

    CaseyForrest IRONY POLICE

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    When you say you cleaned the carb and the muffler is OK, what exactly did you do or check?
     
  3. pinmakers

    pinmakers ArboristSite Lurker

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    Hi, I took the low and high screw out of the carb (walboro), removed the diaphragm cover, checked diaphragm for wear, cracks, removed the other cover on top, dont know what its called that houses the little metering flaps, they're ok, checked the brass screen, clean, removed metering needle, spring etc. shot carb cleaner throughout, let sit, then blewout with air.
    Removed muffler and checked for buildup,slight buildup where it connects to head, cleaned it too. Hope this helps, Bart
     
  4. sugarbush

    sugarbush AboristSite Guru

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    check for a short in ignition, take your bar and chain off, ( at nite) start, turn out the lite's an rev it up. should be able to see if spark is jumping, (cracked wire). may also be your point's.
     
  5. pinmakers

    pinmakers ArboristSite Lurker

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    Thanks, I am new to this, when the bars off, where is the ignition and points located, also, would you know what the point specs should be? How can I tell if they are worn?
    Thanks, Bart
     
  6. sugarbush

    sugarbush AboristSite Guru

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    the point's are behind the flywheel and you'll need a special puller for that. check for a short first, then you'll be better off taking it to a shop for the point's if there is no short.
     
  7. pinmakers

    pinmakers ArboristSite Lurker

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    Wow, quick replies, thanks a million. I'll check the short, leave the points up to the shop. Bart
     
  8. Rotax Robert

    Rotax Robert Addicted to ArboristSite

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    On the flywheel side, It just makes it easier to flip and roll the saw around in the dark without cutting half the stuff up in your shop.

    Rotax
     
  9. pinmakers

    pinmakers ArboristSite Lurker

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    Speaking of the dark, I had to laugh, I lent my other stihl and a poulan to our neighbor last night who helps us all the time, they have pine beetles and had to take down 5 trees, they actually did it in the dark!! I thought they'd at least wait till morning, Boneheads knocked down they're 30 yr. old antique birdhouse falling the last tree......smitherines!:laugh:
     
  10. Brushwacker

    Brushwacker Addicted to ArboristSite

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    Your points can be set right, look good, but if the spring tension that closes your points is to weak, at high rpm range they would stay open.
     
  11. Ekka

    Ekka Diploma Horticulture + Diploma Arboriculture (Leve

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    Hey, get some pics, and of the stump and cut also so we can see what he did. Be good fun for us. I wonder if he actually aimed for it or cut thru his hingewood etc?
     
  12. pinmakers

    pinmakers ArboristSite Lurker

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    I will! No aiming, just shear stupid luck, right between the two trees! B:chainsaw:
     
  13. pinmakers

    pinmakers ArboristSite Lurker

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    So do you think replacing the entire system to electronic would be a good idea? The balance of the saw is in exc. cond.
     
  14. stihltech

    stihltech Addicted to ArboristSite

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    skip

    You have a bad points and condenser. Replace it with an aftermarket module, with the positive and ground switched, and you are good to go.
     
  15. Fish

    Fish Account Hold

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    I agree, it sounds like an ignition problem.
     
  16. Brushwacker

    Brushwacker Addicted to ArboristSite

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    I bought 1 of those modules that replace the pts.& cnds. under $20 on ebay. I think there is 1 listed now. If your coil and switch are good that should work. I never used mine but it looks easy to install with instructions. There is a few differant ones for differant applications. The seller will tell you the one you need for your saw .
     

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