GY6 100cc 50mm Cylinder Block For GY6 139QMB 4-Stroke Engine

Please note this kit is only used for GY6 139QMB 4-Stroke Engine. Inner Diameter of Cylinder: 50mm Outer Diameter of Piston Pin: 13mm Include Cylinder, Piston, Piston Ring, Piston Pin, Piston Pin Clip, Valve Oil Seal, Gaskets, Tensioner Gasket, Exhaust Gasket, Intake& Exhaust Studs, Exhaust Nut High Performance Upgrade 50mm Cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc 100cc engine Includes: 1 x GY6 100cc 50mm Cylinder Block 1 x GY6 100cc 50mm Piston 1 x GY6 100cc Piston Pin (Diameter: 13mm) 2 x GY6 100cc Piston Pin Clip 1 x GY6 100cc High Quality Piston Ring set 1 x GY6 100cc Gasket sets (Cylinder Gasket, Cylinder Head Gasket, Tensioner Gasket) 2 x GY6 100cc Valve Oil Seals 2 x GY6 100cc Intake Studs 2 x GY6 100cc Exhaust Studs & Nuts 1 x GY6 100cc Exhaust Gasket 1. Please confirm the parts will be fit on your scooter/motorcycle before you place the order. 2. Some Modified Spare Parts need to do a small change on your original motorcycle or engine, please make sure you are able to install them by yourself.NO installation instruction and recommend professional installation.