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Message: [QUOTE="dirt bike dave, post: 1433476, member: 18302"] My guess fwiw is that the dark grey oil coating on the piston and cylinder is a mix of powder material sloughed from your piston and unburned premix. Probably as compression was being lost due to irregular heating / lube failure, your son was holding the throttle open to try to keep the bike running. So it was being flooded, and there was already excess heat on the exhaust side, so therefore lots of smoke but no power. [/QUOTE]