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what kind of engine. If its a high performance, u can hook a rope to it from another atv and drag it around with the clutch out. But the type of engine would be nice to know.
if it has a clutch try that. but if it dosent roll it down the hill and try to get the engine to turn over, but be careful it may crack the case.
But other than that its a main berring in the crank shaft i think.