Features: 1.Fitment: Fits for Jog 50cc 2 stroke 1E40QMB Engine; Replacement for Apirilia Vino; Replacement for JOG CV; Replacement for Polaris; Replacement for ZUMA and many more. 2.Function of the Piston: In the engine, the piston transmits the force of the expanding gas in the cylinder to the crankshaft through a piston rod and or connecting rod. 3.High Performance: The cylinder is easy to operate and easy to control, effectively improving the displacement and performance of the engine, increasing horsepower and torsion. 4.Durable: The cylinder is made of aluminum alloy, which has high strength and is not easy to deform, which can reduce the vibration of the engine and make the driving more stable. 5.Complete Repair Kit: Top end rebuild kit includes 11pcs esstential parts, ideal option for your rebuild, repair, and maintenance needs. Specification: Item Type: Cylinder Piston Kit_x000D_ Material: _x000D_ Cylinder Bore: 47mm_x000D_ Cylinder Displacement: 70cc_x000D_ Fitment:_x000D_ Fits for Jog 50cc 2 stroke 1E40QMB Engine_x000D_ Replacement for Apirilia Vino, Replacement for JOG CV, Replacement for Polaris, Replacement for ZUMA and many more!_x000D_ Replacement for Minarelli Horizontal type engine._x000D_ This kit includes things you need to replace your old 50cc cylinder to70cc cylinder._x000D_ Piston Function: A piston is a cylindrical engine component that slides back and forth in the cylinder bore by forces produced during the combustion process. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft through a piston rod and or connecting rod PackageList: 1 x Cylinder Piston Kit (11Pcs)