50mm Big Bore Cylinder Piston Kit For GY6 50cc 4-Stroke Scooters 1P39QMB, 139QMB

Features:
100% brand new and high quality,Durable.
It could correctly replace the original quality part.
This Performance Racing Parts kit can make full use of your 48cc, 50cc scooters.
Specification:
Material: Metal
Head: 64mm valves
Cylinder Size: 50mm ID
Intake Valve Diameter: 18mm
Exhaust Valve Diameter: 16mm
Performance Racing CDI (AC Fired): 70mmx30mmx37mm
Performance Racing Coil length: 360mm
Please allow 0.5-1 inch difference due to manual measurement.(1inch=2.54cm)
Please Compare The Scooter Kit With Your Original One Before Purchasing!
Fits (For the reference):
For 139QMB & 1P39QMB /GY6 50cc 4 Stroke Chinese Scooters
NOTE:
Installation Manual Is NOT Included
Professional Installation Is Highly Recommended
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