A clogged exhaust spark arrestor was the culprit for a saw I helped my in-law fix.
We took it off and torched it till all the build-up was gone. Problem solved.
This was after a thorough carb cleaning and a coil replacement, which did not remedy the issue.
I just purcased this snowbmlower to learn the internals. It initially would not start and discovered the exhaust valve was stuck. After cleaning the valve by removing the muffler I was able to get it to start bu it would smoke. After about 20 min. if it running it was still smoking. I turned it...