Order Includes: 1 x Exhaust Valve, 1 x Outer Valve Spring, 1 x Valve Stem Seal, 2 x Valve Cotter. Compatible with Yamaha models: YZ450F 2010-2013. Part Number: Exhaust Valve: 33D-12121-00-00, Outer Valve Spring: B11-12114-00-00, 33D-12114-00-00, Valve Stem Seal: 51Y-12119-00-00, Valve Cotter: 3LD-12118-00-00. We strongly suggest comparing the posted picture to the unit(s) that needs to be replaced..
