A chainsaw that won't idle could have multiple problems. Most of the time the rings or cylinder are worn pass ther tolerance. Because a two stroke motor should have a negative pressure in crankshaft housing, wore rings or bad cylinder lets part of the compression by ring it upsets the negative pressure crankshaft housing causing it to be positive. Since the fuel oil mixtures are drawn through and around the crankshaft and needles bearing now it is working against itself the saw does not won't to idle correctly. Some people raise ther idle screw but this is not a good idea because now the Chain is running and won't stop very dangerous for operator and people around saw.Lowest compression should be 90 p.s.i. I will talk more about some of the other problems in another tread.
interesting.. I wouldn't have guessed that.. usually when mine has trouble or idles poorly I need to clean out the air filter as its getting dirty
A worn clutch drum on mine and my dads 2152, has made it impossible to set the low idle and my dads shut off if the brake was engaged, put a new Oregon drum,bearing and worm gear on and problem solved.
For me it is the oil/gas ratio mix that keeps my saw from idling. I don't usually measure amounts, just dump in what I think is right, and sometimes not even 2 stroke oil...any oil I can find. The new AutoTune Husqvarna 562 seems to keep up with it better than the Stihl though.
I was gonna say "not good!" but then I remembered, they can't avoid the crusher long enough to wear out so...carry on!
Every time I've had a no idle problem, it was due to the air filter also. Better that way than anything else!
Maybe he forgot his info and signed up again? But it's a hasstle they have to approve you it's not just like instant sign up and post. Maybe he did both as they didn't approve him and there was 2 active logins? I don know just struck me as strange?
I would say that most of the time it is not the rings or cylinder that are wore out. Most home owners and fire wood cutters do not use their saws enough to wear out the rings and cylinder and if they are using good oil in the proper mix they will last for a very long time. Just look at all the old saws that are out there that are still running with some awesome compression. I would say the most common problems on small 2 stroke engines such as chain saws, weed eaters, small tillers, Ice augers, and cut off saws is due to carburetors. Over time the diaphragms and those little rubber reed valves get stiff and the carburetors stop working good. Second most common problem would probably be crank seals. I too worked in a shop doing nothing but the small 2 stroke engines which was my specialty, and not very often did I come across one that would not idle due to worn rings or cylinder. If they are scored that is different, or what I would find is a stuck ring. Since were giving our 2 cents that is mine.
