Stihl 041 AV Carb Adjustment

intc97 Posted By intc97, Oct 6, 2008 at 10:30 AM

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  1. intc97

    intc97
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    Apr 24, 2008
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    Lately my saw will only run well if the choke is about 1/3 on. Since I had a new carb kit put in this summer, I figure it needs an adjustment. Don't have the manual so I'm asking for advise on how to adjust the two screws and which screw is which.
    Thanks
     
  2. smokinj

    smokinj
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    Aug 11, 2008
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    the h screw is adjusted by sound get it to full throttle and turn it till it sounds perfect then back off just a little til it sounds like it missing out just a little.now the L screw is for iddle just turn it till it iddles good!
    http://web.archive.org/web/20051018212959/www.madsens1.com/sawtune.htm
    listen to the "Saw Idle Adjustment Sound WAV" "once you here it you will never forget it"
     
  3. taxidermist

    taxidermist
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    Mar 11, 2008
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    If you had a saw shop install the kit have them tune it for you with a tach. With fuel now a days you want to be right on on your richlean mixture or you will smoke the pistion and cylinder.


    Rob
     
  4. smokinj

    smokinj
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    Aug 11, 2008
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    If you can learn how to do it by ear you will never need a tack! Listen to it on the video its not that hard, and all you need is a screwdriver. You should know this so when your in the field you will never run it to lean
     
  5. taxidermist

    taxidermist
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    If you set it with a tach and then listen to it you will know for sure it is right on the money!
     
  6. smokinj

    smokinj
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    Aug 11, 2008
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    Yep its fun in the garge with a tack, i do it my self but one sould really know in less than a split sec. if its off or not! when temps change alitude or if you like cutting in the rain, you can adjust carb very quickly. just one more tool in the box for free
     
  7. savageactor7

    savageactor7
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    The basic adjustment from the book recommends HS adjustment 3/4 to 1 full turn open. LS 1 to 1 1/4 turns open. The top screw is for idle, the screw underneath it is the high speed. The bigger screw by itself to the left is the low speed. Try that and juke it around a little bit if you have to.
     
  8. smokinj

    smokinj
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    Thats a good starting point but with your ear or tack is the only way to get it dead on!
     
  9. jdemaris

    jdemaris
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    Oct 11, 2008
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    I was a Stihl mechanic starting back before Stihl have a real presence in the USA via Virginia Beach. The 040s and 041s had their own special problems.

    Does it idle properly? All the 040s and 041s are prone to sucking in intake-manifold gaskets as well as breaking fuel-pump hoses.

    For basic carb adjustment - just start out with the high and low screw both at one-turn. If, when you first start it cold it bogs when you gun it, just open up the low screw a bit. And, when warm, the high screw needs to be set so it runs so rich, it breaks up a little at high RPMs -no load -and smooths out when you start cutting.

    Any 041 needs - |

    the fuel impulse hose in one piece

    the intake manifold removed - checked for a pulled out steel bushings and/or a warped surface-and reinstalled with Loctite. A warped manifold can often be filed smooth and resused.

    the little screen checked and cleaned if needed inside carb. It will clog often if the saw is used often with a dull chain. That because a dull chain makes dust instead of chips - and that dust will pass throught the filter in the tank.
     
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