Question about Husqvarna Forest & Garden #952802239 235E 16" Gas Chain Saw

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When using my saw at full revs and cutting it almost dies. have looked at tuning it but the points are fixed unlike a normal saw. the only part adjustable is the idle speed. any ideas??

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The jet screws have special 'D' heads that are intended to prevent owner tampering. Your options are to make your own special 'D' head screwdriver or to take the saw to a servicing dealer for adjustment. Check the fuel filter, air cleaner, and muffler for plugging. Make sure the fuel lines are in good condition. Check the carburetor fasteners for tightness. If there was a problem and repaired, that might correct the lean-running condition. Don't continue to operate a lean-running saw as that will damage the engine internals for lack of lubrication. Hope this helps!

Posted on Jul 11, 2010

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Sounds like a tuning issue and carb problem. Before you go spending money on carbs or carb kits and start stripping down the carb, try this first.
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*Pull over until the engine fires up, it should run for a second and cut out.
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Start saw as normal and see if its any better. Failing that your probably looking at cleaning the carb or replacing diaphrams.

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Adjusting carbs on chainsaws is not to be taken on lightly, there will normally be three screws, an L screw, an H screw, and an idle scre, the L screw will increase the fuel mixture from idle to half throttle ( they are fuel screws not air screws ) the H screw will adjust from half throttle to maximum revs, start with a base setting of between one turn and one and a half turns out, start the saw and warm through, allow it to idle, if need be increase the idle screw to get an idle, turn the L screw in slowley, the revs will increase as the mixture leans off, it will reach a point where it starts to die, now back it off a quarter of a turn, blip the throttle, the saw should pick up clean, if it has a flat spot increase the L screw slightley, now set the idle so it idles without the chain moving on the bar, now screw the H screw in to get full revs, be aware this should be set with an engine rev counter, do not exceed the manufacturersmax revs, hobby saws normally run at about 12500 rpm with an idle speed of 3000 rpm.

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1 Answer

Hi, i have a 1999 husqvarna 254xp... its abit hard to start and never idles more than 3secs.....from doing some looking into , i think maybe the L screw needs adj? if so could u explain in simple terms how...


In simple terms here we go, turn both L screw and H screw fully in until they stop ( clock wise ) now turn the L scew out one and a half turns out, and the H screw one and a quarter turns out, start the saw ans warm up the engine, allow the saw to idle, if need be turn the idle screw in to gain a slightly fast idle, start to turn the L screw in, the revs will start to increse as the mixture leans off, thet will reach a point where the engine then starts to die because it is too len, at this point unscrew the screw quarter turn, check the machine revs up clean, if there is a hesitation unscrew the jet a smaal bit at a time until it revs clean, now adjust the idle screw so the engine idles without the cutting chain rotating around the bar, the H screw should be about right however if it sounds too rich at full throttle srew the jet in a small amount until it sounds right, the maximum rpm should not exceed 13500, this should realy be check with a rev counter, if the engine revs too high there is a fear that it will over heat and seize.

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1 Answer

My saw goes really flat and almost cuts out when cutting at full revs. have tried tuning but the tuning points are fixed unlike a normal saw. Any ideas??


If you are speaking of the H and L jet screws, they have special 'D' shaped heads that require the use of a special 'D' shaped screwdriver. This is so thanks to the EPA who has decided that folks in the USA have no business adjusting their own saws which is causing untold pollution. The only options that you have are: make your own 'D' head screwdriver, or take the saw to an authorized dealer for adjustment. (they are the only ones permitted to have the necessary tool) Good luck!

Jul 07, 2010 | Husqvarna Forest & Garden #952802239 235E...

1 Answer

Cuts out on high revs 240 chain saw


Many saws made today are using electronics for engine control. If the engine rpm's starts to rev to high, the electronics in the coil will start to 'cut out' some of the spark. This is normal in this senerio.

But, now the real problem causing the senerio;

Fuel starvation - 'lean fuel' condition
Basic things to check:
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Remove Carburetor
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