This battery will fit all of the listed Yamaha motorcycles in the compatibility section. This is a drop-in sealed AGM maintenance-free replacement for the original Motorcycle battery. No more hassle with adding battery acid and charging - this battery arrives fully charged and ready for immediate installation! New hardware will be included with the battery, it is recommended to use this hardware when installing the battery. This Origin battery is a drop-in replacement for the Motorcycle QT50 Yamahopper (1979-1987) unit.