A03K Cylinder And Piston Ring Pin Kit 77MM Engine For ADV350 ADV 350 SH350 Sh350i Motorcycle Scooter Parts This cylinder and piston ring pin kit is designed for use with 77mm engines on select motorcycle scooter models.The set includes a cylinder, piston rings, and wrist pin components necessary for engine rebuilds or performance.Compatible with specified ADV and SH series , the kit supports proper engine compression and smooth when installed correctly.Each part is manufactured to match dimensions for fitment and function. This replacement part is manufactured independently.All brand references are used solely to denote compatibility with listed models.