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crf50 flipped upside down

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My 6 year old boy flipped his crf50 upside down and now it is smoking when you rev it up will this burn off? (I ran the bike for a couple of minutes after it happened but smoking continued) Will using the bike do any harm to the motor? it never smoked at all before it went upside down.

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The crankcase breather is vented to the carb. Usually, just vapors are vented to the carb and there's not enough oil in the vapors to cause smoke (assuming a tight engine). What probably happened in your case is that oil from the crankcase got into the carb via the crankcase vent.

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