ENGINE GY6 50CC 139QMB (5)

NCY 88cc Aluminum Performance Cylinder Head. High quality alloy cylinder head designed to work seamlessly with the 1100-1237 88cc cylinder kit. Give your QMB139 the power to get some respect....

88cc cylinder for you, although this is not a bolt-on item for most QMB 139 bikes. Most of the time, engine cases need to be cut. Order part number 1400-1001,...

The NCY 16/42 secondary gear kit is designed to modify the final drive ratio of GY6 50cc 139QMB / 139QMA engines. With its 16/42 ratio, it optimizes the transmission's behavior...

The NCY QMB139 upgrade kit for your 50cc 4-stroke is finally here! This kit is specifically designed for 88cc big bore engines and increases your gear ratio by 30%. This...

The NCY QMB139 upgrade kit for your 50cc 4-stroke is finally here! This kit is specifically designed for big bore engines and increases your gear ratio by 26%. This will...