36mm Piston Rings Full Gasket Kit For 33cc 36F-2 Engine 9mm Pin This piston ring set is designed for engines with a 36mm cylinder diameter.It is commonly referred to as 36F-2 in China to distinguish it from another engine model that uses the same cylinder size but different specifications, such as the 328 engine.The piston ring has a thickness of 1.5mm and is compatible with a 9mm wrist pin.The kit includes a full set of gaskets for complete engine sealing during rebuild or maintenance.