Vibration above 4200
 

A few wks ago I bumped my lower unit, Alpha 1 Gen 2, on a sand bar at idle. Ever since then i get a slight vibration at anything above 4200 rpm. I have checked the prop shaft and it is in speck. The prop is an aluminum 3 blade that is 2 months old. Only thing you can tell by looking at the prop is that it is now missing paint on 2 blades the size of a dime. Nothing looks bent. Any ideas? Could I have bent the internals of the prop?

Chris

TRy a different prop... that prop being alum. is the sacraficial lamb of the drive train. I really dont see you tearing anything else up without the prop looking like silly putty. I forget the exact figures I saw the other day, but ballpark the prop tips are traveling over 150 mph thru the water so it doesnt take much to throw it off.