Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped 1.This Cylinder fits the 76mm Bolt Pattern Engine, It will not work on the 80mm Bolt Pattern 2.Inner Diameter of Cylinder: 57.4mm 3.Outer Diameter of Piston Pin: 15mm 4.High Quality Durable Piston Rings 5.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut