Behind the clutch flywheel, the clutch mechanism (pulley) is free (as in not fixed in any way to the shaft). In the pulley center, there is a springed circlip and two thrust washers that sandwich a special splined washer that fits into a groove which keeps the pulley at just the right distance to prevent binding/rubbing on the magneto cover nut. The two thrust washers are of different thicknesses and they need to be installed in the correct order. (I'm not sure which one goes where. I'll check ny manual today and leave a post later). If anyone has taken this clutch apart, it is fairly likely that this order was overlooked. You could always try it both ways (thin washer on bottom/thick on top...and in reverse). Also, when you take the clip and washers off, pull out the roller bearing and check to see that it is in good condition. When you put it all together and reinstall the flywheel, tighten the nut snug (not crazy tight).