Motorcycle One-Way Bearing Starter Clutch for WR250F WR250 2015 2016-2018 WR450F YZ250FX YZ450FX YFZ450R YFZ450X Special Product Name: Motorcycle Engine One Way Starter Clutch Material: Aluminum Quality: Grade A This one-way starter clutch bearing is designed to work with a variety of motorcycle models.It functions by allowing the starter motor to drive the overrunning clutch at speed during engine startup, generating sufficient force to turn the crankshaft and initiate piston movement.This mechanism helps prevent damage to the motor's reverse resistance.Special function: Provides power and fuel delivery support to the fuel supply system.Compatible with the following models: One Way Starter Clutch Bearing for: WR250F 2003 WR250 / WR250F 2015–2018 WR450F 2003–2018 YZ250FX 2015–2018 YZ450FX 2016–2018 YFZ450R 2009–2018 YFZ450R Special Edition 2010–2018 YFZ450X and YFZ450X Special Edition 2010–2011 YFZ450 5TG 2004–2006 YFZ450 5D3 2007–2009 YFZ450S 5TG 2004 YFZ450SEY 5D3 2009 YFZ450SPX 5D3 2008 YFZ450T 5TG 2005 YFZ450V 5TG 2006 YFZ450W 5D3 2007 YFZ450X 5D3 2008 YFZ450Y 5D3 2009 Includes: 1 x Motorcycle Starter Clutch Assembly Important Notice: This aftermarket part is unaffiliated with brands.Model mentions indicate fitment only.