2 stroke starting problem

[mwatsonxx]

I have a stihl chainsaw that has become difficult to start. The pull cord used to have a smooth action, but now it has become very jerky and almost impossible to pull. It will start and run eventually so its not seized.

Any ideas, thanks

 

[ahoude]

What model, does it have a decomp. valve, has it been thoroughly cleaned lately? I'd start by giving the clutch and recoil area a good cleaning. Pull the muffler off and see if there is any scoring on the piston or cylinder.

Andy

 

[mwatsonxx]

Thanks Andy,

The saw is now running smooth as silk and the jerkiness is back to normal, ie just a firm resistance.

I cleaned the spark plug and air filter. Then I discovered a very fine metal mesh filter on the exhaust outlet. It was 90% clogged up with black soot, cleaned it all off and - vroom vroom.

 

[ahoude]

Spark arrestor plugged. Got to run it a little harder to keep it clean or pull it out and burn it off with a torch. Make sure your mix is right too.

Andy

 

[mwatsonxx]

.,.,,,,,,,,,,,,,,,,,,,