Motorcycle 40-6 Piston Pin Full Kit For 47cc 49cc 2 Stroke Mmini Bike Pit Bike This piston pin full kit is designed for 47cc and 49cc 2 stroke engines commonly found in bikes, pit bikes, and bikes.The set includes all necessary components for piston assembly, compatibility with standard 40-6 engine configurations.machined parts provide performance and smooth within the engine's crankcase.Suitable for routine maintenance or engine rebuilds, the kit supports proper piston movement and under normal operating conditions.