Motorcycle One Way Starter Clutch Bearing designed for compatibility with WR250F, YZ250F 2015, YZ250X, YZ250FX, YFZ450, YFZ450R, WR450F, YZ450X, and YZ450FX models.This starter clutch is engineered for direct installation, matching OEM specifications for a secure fit without the need for modifications.It features a hardened and ground construction to improve under repeated starting cycles.The design includes stronger rollers to enhance performance and over time.Suitable for 250cc and 450cc two-cylinder engines, this component supports efficient engagement of the starter system.Built to operate reliably at temperatures up to 105℃, it maintains structural integrity in riding conditions.A functional upgrade for off-road and motocross applications where consistent starter performance is required.