50MM Metal Big Bore Cylinder Piston Kit For GY6 48/50CC 4-Stroke Scooters 139QMB/1P39QMB

【Specification】Material: Metal; Head: 64mm valves Cylinder Size: 50mm ID; Diamater: Intake Valve Diameter: 18mm; Exhaust Valve Diameter: 16mm; Performance Racing CDI (AC Fired): 70mmx30mmx37mm; Performance Racing Coil length: 360mm 【Premium Material】This cylinder kit is made of high quality metal, can replace the original correctly, 100% new high quality, durable. 【Fit For】For 139QMB & 1P39QMB /GY6 50cc 4 Stroke Scooters 【Package Includes】·50mm Big Bore Cylinder Kit With Assembled Head, Performance Racing CDI (AC Fired), Performance Racing Coil, Rollers, Rocker Arms, Oil Pump & Drive Gear, Intake & Exhaust Studs & Complete Gasket Set 【NOTE】Instruction not included, professional installation is always recommended.