Motorcycle One Way Starter Clutch Bearing For TTR250 XV250 YFM250 XT250 YZ250FX YZ450X YZ450FX YFZ600 FZR600 This one way starter clutch bearing is designed for use with specified motorcycle models.It functions as a key component in the starter system, allowing rotational in while preventing it in the reverse.The bearing fits motorcycles with compatible engine configurations and replaces the part.Constructed for and consistent performance, it supports engine startup and smooth engagement of the starter mechanism.proper installation with standard tools and mechanical knowledge.