Question about Husqvarna Chain Saw 20" Bar

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After running for about a half hour or so it begins to stall in between cuts . . should i adjust the low,high or idle screw

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Is the chain being properly oiled? You should get a thin line of oil after running the tip of the saw near to a piece of paper or cardboard for moment or two. Is the saw getting overly hot after running? Clean the cylinder and air passages with compressed air if it is. Check the muffler for any plugging of spark arrestor screen. Turn both jet screws CW to stops (lightly) then turn both out 1-1/2 turns CCW for a basic setting. Pull throttle full on (after warm up) and adjust H for high engine speed, but 4-stroking that smooths out immediately when cutting. Release throttle and adjust L for fairly smooth idle, but rich enough to allow the engine to 'follow-the-throttle'. Adjust idle speed so that the chain stops moving. Hope this helps.

Posted on Oct 08, 2009

  • drallim Oct 08, 2009

    Is the chain being properly oiled? You should get a thin line of oil after running the tip of the saw near to a piece of paper or cardboard for moment or two. Is the saw getting overly hot after running? Clean the cylinder and air passages with compressed air if it is. Check the muffler for any plugging of spark arrestor screen. Turn both jet screws CW to stops (lightly) then turn both out 1-1/2 turns CCW for a basic setting. Pull throttle full on (after warm up) and adjust H for high engine speed, but 4-stroking that smooths out immediately when cutting. Release throttle and adjust L for fairly smooth idle, but rich enough to allow the engine to 'follow-the-throttle'. Adjust idle speed so that the chain stops moving. Hope this helps.

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http://www.madsens1.com/saw%20carb%20tune.htm
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Start the engine and turn the high speed screw "H" in(clockwise)until the engine starts to slow down(the fuel mixture is to lean,not enough gas).

Slowly turn the screw out(counterclockwise)until the engine begins to run smoothly,keep going very slowly until the engines just begins to run rough again(rich condition,watch for black smoke from exhaust).

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best regards savumihai71

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