If smoke is black the problem is a carb issue, if bluish white the rings are worn and will need replacement. 99% of the time only rings will need replacement. Some of the scouts used 57mm rings and some used 57.4 rings so you will have to check using a michrometer of calipers. You will also inspect the cylinder for abnormal wear such as scraping or gouging. If you can feel either with your finger the cylinder will need replacement.
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