This 250cc 77mm cylinder kit is compatible with KX250F models from 2004 to 2016.It is designed as a direct replacement for the cylinder and helps restore engine performance.The 77mm bore supports increased power output and improved efficiency, making it suitable for off-road and racing applications.The kit includes a cylinder, piston ring set, and gasket set to provide all necessary components for installation.The cylinder features a ceramic-coated bore for enhanced heat dissipation, which helps reduce overheating and supports extended engine life.A forged piston is included to under various riding conditions.The design allows for straightforward assembly without requiring tools.