2001-2013 Yamaha WR250F 77mm Stock Bore Cylinder Piston Top End Rebuild Kit 5XC-11311-20 5NL-11351-00Features: If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing for you. Kit includes cylinder, forged piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured). Nickel Silicon Carbide plated for long life. Piston is anodized for superior heat resistance and longer lifespan. The gaskets use performance materials to increase durability and