The primary clutch is a complicated kind of centrifugal clutch and is typically mounted on the output close in the motor crankshaft. The clutch has two sheave faces; one which is laterally set (stationary sheave), and one that can move in and out to engage the belt (moveable sheave). https://gearbox-cvt20853.blog4youth.com/32937240/helping-the-others-realize-the-advantages-of-cvt