Motorcycle Parts 66.4mm Cylinder Block+Head Complete Gasket+Piston Ring Kit For YZ250 50TH YZ250G YZ 250 G metal construction long-term use in demanding riding conditions.This replacement kit includes a 66.4mm cylinder block, cylinder head, complete gasket set, and piston ring set.Designed for precise fitment on YZ250, YZ250G, YZ250 Mo---, and YZ250 50TH models, the components support engine performance and efficient combustion.The design emphasizes accuracy and functionality, meeting ISO9001 external testing standards for consistent quality.Installation is straightforward as the parts are engineered to match specifications, making it suitable for engine or repairs. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.