MS260 problems?

[James.R]

Hi everyone,

Im new on here and am looking forward to having a good look round!

 

I recently bought a second hand MS260 as my first chainsaw because it was the model i used on my CS30 and I got along great with it.

 

Having cleaned and serviced my chainsaw I took it out for the first time last week. Started fine and cut really well, the only problem was every so often when i took the chain brake off, it stalled and just died? I could restart it and use it as normal but every so often it would stall again?

 

Any ideas what the problem might be or experience with the same problem?

 

Many thanks

 

James.

[Stubby]

Hi. Hope you are well . Ask spud (spudulike) He will know . He knows everything !

[spudulike]

Saws usually stall when you apply the chain brake, usually through dirt or wear around the chainbrake, clutch and sprocket bearing so worth a clean up in this area

[pleasant]

Saws usually stall when you apply the chain brake, usually through dirt or wear around the chainbrake, clutch and sprocket bearing so worth a clean up in this area

 

It would appear the saw stalls when the chainbrake is deactivated (off) rather than activated.....or that's how I read his question anyway.

[Big T]

My 260 does the same, sometimes when deactivating the chainbrake it will just die!

[James.R]

Yes its when i take the chain brake off to cut, that it stalls and dies.

[Stubby]

Have you tried the saw on a flat suface and hold it down firm then let the brake off ?( whithout moving the body of the saw ) What I am thinking is it might be the action of letting the brake of rather than the brake its self . If you flick it off with your wrist , it tipps the saw forward and down with a jirk . Maybe thete is somethig loose/wrong in the carb that gets diturbed when you do this . Possibly !

[spudulike]

It would appear the saw stalls when the chainbrake is deactivated (off) rather than activated.....or that's how I read his question anyway.

 

Yes, I was making the point that the fault was the opposite of what I would expect.

I am thinking that when the brake is taken off, the act is impacting from the locked up sprocket on to the spinning crankshaft\clutch and stalling the engine, it doesn't take mutch. Strip, clean, inspect the bearing for play and then grease and try again.

One thought, are your clutch springs shot, if so, letting off the brake would throw the running engine on idle in to the stationary chain - does your chain spin on idle when the brake isn't on?

[Big T]

I dunno about james but my chain doesnt spin at idle with the chainbrake off. I was told my problem was "just a stihl thing"!

[Megatron]

How does the saw cut out? Instantly or does it "load up" first.

 

Sounds as if it may be running too rich on the idle circuit. Like Stubby says it is most likely the act of deactivating the chain brake. When a saw is left to idle, if it is slightly too rich on the L screw, fuel can puddle in the crankcase. When the saw is tipped (which it usually is when deactivating the brake) the puddled fuel will mix with the fresh charge in the crankcase making it way too rich and the saw will stumble and die.