Eliminate mid-range "flat spots" and take full control of your powerband with the NCY Secondary Sliding Sheave. Engineered as a high-performance alternative to the linear factory pulley, this "Torque Driver" features dual-machined ramp angles. This allows you to choose between an aggressive curve for instant "off-the-line" snap or a progressive curve for smoother, high-velocity cruising.
This assembly is a direct performance replacement for 125cc, 150cc, and 170cc 4-stroke engines, including:
Tech Tip: For maximum performance, pair this torque driver with an NCY Gen 4 Performance Clutch and a 1500 or 2000 RPM Contra Spring. This combination ensures your belt stays tight and your RPMs stay high during hill climbs and heavy acceleration.
Performance Note: Greasing with high-temp Moly grease during installation is suggested for optimal performance.
*Performance upgrades are considered racing parts and are not covered by warranty.
