I don't mean to be rude, and I don't know what kind of engine and clutch set up you are talking about, but I know on mine that when the clutch is not engaged, my crank and piston are NOT moving. The whole point of the clutch is to engage and disengage the engine. My bike does not even roll when the clutch is engaged because of the compression, when the clutch is disengaged, I can roll it. This is how bump starting works too. I'm just saying that there is absolutely NO reason for the piston, rod, and crank to be spinning when the clutch is not engaged.