NCY High-RPM Racing Valve Set - 28/23mm for GY6 rear brake drum an industry leader since 1977

an industry leader since 1977

Designed specifically for the GY6 139QMB engine platform

clutch bell not included

minor compatibility modifications may be needed depending on model year

Drive End Thread Length: 14mm

NCY High-RPM Racing Valve Set - 28/23mm for GY6 rear brake drum an industry leader since 1977NCY Performance Racing Valves deliver a noticeable improvement in idle quality and high end pull on GY6 125cc, 150cc, and 171cc engines. Precision lapped seats ensure a perfect 360 seal, eliminating compression loss and erratic idling common with soft factory valves that stretch or leak under high stress. These are also the OEM replacement valves for the NCY Big Valve High Flow Cylinder Head (SKU 1100 1254). Made in Taiwan. SKU: 1100 1257. Key