Why is it everyone appears to be afraid of the single bolt prop hub????????? All the engines out here started with a single bolt hub until 3W stuck their multi bolt hub on the market. Were they any better or safer?? I doubt there is any proof to that, but since everyone thought they looked cool they had to have a multi bolt hub, too. The single bolt hubs work just fine, and don't loosen up any more than any other. Matter of fact the single bolt hub may be safer due to retaining more undrilled mass at the prop hub.

As far as vibration is concerned, a well balanced prop on a single cylinder "thumper" well go a long, long way to reducing the vibration level to close to that of most twins. Sheesh!!!!!!!

Pat