Motorcycle One Way Starter Clutch Gear Assy Kit For TRX450R TRX450ER CRF450X TRX450 R TRX 450 TRX450 CRF450 X CRF 450 Starter clutch gear assembly designed for use with select motorcycle models.Constructed from forged steel for performance.Includes one complete set of starter clutch components.Features hardened and ground surfaces .Equipped with stronger rollers to improve function .Suitable for applications requiring engagement and smooth in the starting mechanism. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.