8 80cafe750 CB750 Member Messages 12 Reaction score 0 Points 1 Location Richmond va Nov 21, 2015 #1 1980 cb750 it knocks in the chain area when I'm in the throttel and in gear it just started
amc49 CB750 Guru Messages 3,476 Reaction score 49 Points 36 Location Fort Worth TX. Nov 25, 2015 #2 Possible drive tabs broken inside hub (behind sprocket). Or worn dead sprocket jumping at teeth.