NCY 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.
Tech Tip: Pair with NCY Performance Valve Springs rated for 11,000 RPM. Always lap new valves into the head with fine-grit grinding compound to ensure a gas-tight seal before final assembly.
This product is intended for off-road use only. Not legal for use in California on pollution-controlled vehicles. Check local laws before installing.
Performance upgrades are considered racing parts and are not covered by warranty.
California Prop 65 Warning: www.p65warnings.ca.gov
