The primary clutch is a sophisticated method of centrifugal clutch and is typically mounted on the output finish with the engine crankshaft. The clutch has two sheave faces; one which is laterally set (stationary sheave), and one which can transfer out and in to engage the belt (moveable sheave). https://gearboxcvt86429.tribunablog.com/considerations-to-know-about-cvt-46740780