chainsaw cuts out after heavy use

Old 05-02-14, 11:15 AM
Thread Starter
Join Date: May 2014
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
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?
Old 05-02-14, 12:55 PM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 9,927
Upvotes: 0
Received 7 Upvotes on 6 Posts
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.
Old 05-02-14, 02:59 PM
Forum Topic Moderator
Join Date: Mar 2005
Location: USA - N.E.Tn
Posts: 45,494
Received 800 Upvotes on 703 Posts
I'd also check/clean the air filter and sparkplug.

edit; oops, I see you already cleaned the filter
Old 05-02-14, 07:07 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 15,920
Received 133 Upvotes on 122 Posts
Might try backing out the mixture screws a tad.
Old 05-03-14, 11:11 AM
Join Date: May 2006
Location: Iowa!!!!!
Posts: 3,826
Received 33 Upvotes on 32 Posts
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.
Old 05-03-14, 07:35 PM
Join Date: Aug 2013
Location: usa
Posts: 14
Upvotes: 0
Received 0 Upvotes on 0 Posts
check that the chain isn't too tight

Thread Tools
Search this Thread
Ask a Question
Question Title: