Motorcycle One Way Starter Clutch Bearing For YFZ450 YFZ450R YFZ450X YFZ450S YFZ450T YFZ450V YFZ450W YFZ450Y 5TG 5D3 This one way starter clutch bearing is designed for use with YFZ450, YFZ450R, YFZ450X, YFZ450S, YFZ450T, YFZ450V, YFZ450W, YFZ450Y, 5TG, and 5D3 motorcycle models.It functions as a starter overrunning clutch, allowing the engine to start smoothly by engaging the starter mechanism in while disengaging in the other.The bearing fits directly into the starter system and is built to withstand regular use under typical operating conditions.It is suitable for replacement or upgrade in compatible ATV and motorcycle engines. Disclaimer: This replacement is not affiliated with any manufacturer.Model references indicate fitment only.