NCY Performance Adjustable Sheave Clutch Pulley - GY6 & Navi donut keeping your 50cc motor pinned

keeping your 50cc motor pinned directly inside its optimal powerband

Additionally

Tuning Tip: Jetting is something that requires trial and error

Main bearings included

NCY Performance Adjustable Sheave Clutch Pulley - GY6 & Navi donut keeping your 50cc motor pinnedMaximize Your CVT Performance: NCY Adjustable Torque Driver 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.