Motorcycle Pipe Gasket For Yamaha WR250F WR250R YZ250F YZ250FX YZ450F YZ450FX WIDE APPLICATION; matched for Yamaha WR250F WR250R YZ250F YZ250FX YZ450F YZ450FX off road motocross bikes for header pipe connection replacement EASY INSTALLATION; die stamped to OEM flange dimension with accurate inner outer diameter; direct bolt on fit without grinding or TEMP DURABLE MATERIAL; reinforced composite with core; withstands extreme rough terrain heavy vibration STRONG AIRTIGHT SEAL; reliable crush sealing blocks leakage; loud popping noise power loss caused by leaking pipe joints ; stable compression retention deformation; accessory for upgrade projects