Have a pieced together 79 fx that currently has a worn out rotary top trans. Am going to replace with a revtech ratchet top. (already have trans) Bike is final belt driven. Anyone know if i will have to replace belt with chain drive? (revtech says trans "should not be used with belt drive") not sure why belt cant be used except maybe spacing. Also are the clutch cables diffrerent? Thanks in advance for any help!