OK, so I am in the process of modifying a motored bike to include a centrifugal clutch, which I got from Ebay. It's a comet clutch with a pulley, 5/8" shaft, pretty much standard looking clutch like you would find on a minibike or go cart. When I put the clutch on the motor (a Toro snowblower motor, maybe 35 or 50 cc's?), it bogs the motor down at idle so far it will barely run, and then kills it when I try to acelerate. When I take the belt off, and let the clutch freewheel, the engine runs fine. So my question is, is the clutch bad (it is old and rusty looking, and maybe weak springs are allowing it to engage at idle speeds), or will a clutch rated for too high a horsepower just drag a small engine down by virtue of the inherent friction involved even when the clutch is not engaged? Know what I mean? Does anybody have some experience with this? Thanks in advance for the help..you guys rock!