[fishhead]

For some unknown reason the idle speed on my Husky 137 chainsaw has suddenly increased. I had it adjusted just perfectly and it ran that way for several years. Now it has suddenly increased to the point where the chain spins pretty fast.

Is it just a matter of readjusting the idle speed? Or could it be that a piece of dirt has partially blocked the carburetor? Last fall it speeded up but after I ran it for about 15 minutes it idled back down by itself. I just ran it for another 15 minutes and it didn't slow down this time.

 

[fishhead]

I ran it dry last fall but it's got plenty of gas now.

I'm kind of concerned that it might have a particle blocking the flow of gas and causing it to run lean. But would that necessarily make it run fast on idle? And would it go away after running it for 15 minutes like it did last fall?

I had a 16 hp Johnson snowmobile and one night it leaned out. I could keep up with the neighbors 500 TX Polaris for a few hours but then it got slower and slower. We ended up replacing one of the cylinders.

 

[fishhead]

Whatever it was has seemed to have fixed itself.