Alternator Rotor Nut & Washer Set. This alternator rotor nut and washer set secures the rotor on the crankshaft taper and should match the original thread and washer style.Replace this hardware when the nut or washer is rounded, missing, damaged, or the rotor has been removed for service.Fitment / CompatibilityFits Yamaha: Yamaha TX500 (1973-74) Yamaha XS500 (1975-77) Yamaha TX650 (1973-74) Yamaha TX750 (1973-74) Yamaha XS1 1970 Yamaha XS1B 1971 Yamaha XS2 1972 Yamaha XS650 (1975-81) Yamaha XS650S (1978-83) Yamaha XS750 1978 Yamaha XS1100 1978 Product Details Alternator rotor nut / washer hardware Sold as a set XS650Direct part number: 24-2647 Before Ordering Confirm thread size, washer style, rotor fit, and crankshaft thread condition. Torque the rotor hardware to specification and verify charging clearance before running the engine.