PMK
Active member
James Thorne, next time you pull a sprocket / pulley, can you check if Rotax used a wear collar between the pulley and the output shaft bearing inner race.
Typically, manufacturers do not have the gearbox output shaft seal ride directly on the gearbox shaft. Most times a collar is slid over the shaft, sometimes using a small o ring to prevent leaks, that allows the seal to wear into the easily replaced collar.
If there is a collar, one would expect it to be made longer rather than install a washer.
Regardless, the pulley bolt merely keeps it from falling off the shaft. The splines provide the torque interface for motion.
Typically, manufacturers do not have the gearbox output shaft seal ride directly on the gearbox shaft. Most times a collar is slid over the shaft, sometimes using a small o ring to prevent leaks, that allows the seal to wear into the easily replaced collar.
If there is a collar, one would expect it to be made longer rather than install a washer.
Regardless, the pulley bolt merely keeps it from falling off the shaft. The splines provide the torque interface for motion.