Motorcycle Accessories Cylinder Bore Size 77 77.25 77.5 77.75 78mm Piston Rings Kit For WR250R WR250X 3D7-11631-00-00 This piston rings kit is designed for use with WR250R and WR250X models from 2007 to 2017.It supports multiple cylinder bore sizes including 77mm, 77.25mm, 77.5mm, 77.75mm, and 78mm, allowing compatibility with various engine configurations.The kit contains a full set of piston rings along with all necessary components for installation. Constructed from metal, the rings provide resistance to wear and support consistent engine performance.They are engineered to fit precisely within the cylinder bore, helping to maintain compression and reduce piston noise caused by excessive clearance or out-of-round conditions.The design focuses on functional and ease of integration into engine rebuilds. Suitable for both routine maintenance and performance restoration, this piston ring set is intended to restore proper function to the engine's combustion chamber.It includes clear guidance for installation, making it accessible for mechanics and DIY users alike.The kit meets standard specifications for fit and function, supporting long-term engine when installed correctly. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.