441 CM carb not adjusting properly

[chadihman]

I never worked on any CM saws. The saw had a blown piston and cylinder. Pressure tested good. Has a new jug and piston and the carb was really running rich like 8000 rpms. Tried recalibrating now it seams to lean. Hmmm carb or coil? Carbs internals look good. Any ideas?

 

[john_bud]

I never worked on any CM saws. The saw had a blown piston and cylinder. Pressure tested good. Has a new jug and piston and the carb was really running rich like 8000 rpms. Tried recalibrating now it seams to lean. Hmmm carb or coil? Carbs internals look good. Any ideas?

I read in a Mastermind thread on the ms261 that if there is a vacuum leak, the system will go slobber gobber rich to protect the saw from lean burn out. Based on that, I would suspect an air leak. But, that's from a non-expert...