Just rebuilt my shee. Complete engine and tranny overhaul. I've rode about 6 300ft passes after a few heat cycles. New pwk 39mm carbs and new porting and rdz sb off pipes and 4mil crank. I was doin test and tune. On the last pass it started poring out smoke out of the right cylinder. Smells funny too. My guess is crank seal would I be correct to assume that? But I did get a good burn on the pass before the smoke, golden brown lol.