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...
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