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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.

Thanks for confirming and the advice. At this point, I'll look for a replacement engine as it will be less of a hassle.

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...