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chainsaw cuts out after heavy use

Mathijs Kok's Avatar

Join Date: May 2014
Posts: 1

05-02-14, 10:15 AM   #1  
chainsaw cuts out after heavy use

My chainsaw got an issue that I can't seen to figure out.

It starts fine, runs great (perhaps a bit too fast not sure). But when it is used seriously and I idle it stops running. Only by very slowly reducing throttle am I am able to keep it running at idle. Oil is okay, petrol is okay, air filter cleaned out.

Any suggestions?

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Sharp Advice's Avatar
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05-02-14, 11:55 AM   #2  
Hello and Welcome to the web site.

Suggestions wanted and/or possible causes?


Engine seems to run a bit to fast? Note worthy point. Most likely and usually caused by a lean fuel mixture. Engine speeds controlled by fuel mixture. Less fuel creates a lean mixture resulting in higher engine speeds. There is no engine speed governor on the engine. Controlled by fuel mixture. Richer fuel mixtures slows speeds down. It's a proper balance of fuel out of the carb between low speed and high speed. You'll need to determine the possible causes.

If the chain saw has set unused for some time, might be a slightly restricted fuel flow. Check fuel filter. Or some gum or varnish in the carbs idle circuit and/or both high and low speed carb circuits.

Regards and Good Luck.
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marksr's Avatar
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05-02-14, 01:59 PM   #3  
I'd also check/clean the air filter and sparkplug.

edit; oops, I see you already cleaned the filter

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cheese's Avatar
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05-02-14, 06:07 PM   #4  
Might try backing out the mixture screws a tad.

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marbobj's Avatar

Join Date: May 2006
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05-03-14, 10:11 AM   #5  
It can get serious with a lean mixture = piston and cylinder scoring. The lean mixture provides less oil for lubrication.

If you can't get the fuel air mixture taken care of and you have to use the saw, you'll need to use a heavier concentration of oil to gasoline in the fuel mix. If you're using 50:1 go to 32:1 to get more oil into the engine.

Nummy's Avatar

Join Date: Aug 2013
Posts: 14

05-03-14, 06:35 PM   #6  
check that the chain isn't too tight

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