The primary clutch is a sophisticated form of centrifugal clutch and is often mounted for the output close on the motor crankshaft. The clutch has two sheave faces; one that is laterally mounted (stationary sheave), and one that can transfer in and out to engage the belt (moveable sheave). https://cvt08530.therainblog.com/31384187/the-smart-trick-of-gearbox-cvt-that-no-one-is-discussing