... gearbox, oil pump, water pump and other structure of transmission. Advantages of PM gear:Few waste of the material, formed ... plate, valve guide, inlet and exhaust valve seat.Transmission parts, gear hub and parts of various high and low speed synchronizer, clutch ... axle sleeve, guide block, synchronous ring. Motorcycle:Driven gear and parts, sprocket, starter pawl, ratchet, star gear, duplicate gear, ...