The principal clutch is a sophisticated method of centrifugal clutch and is often mounted into the output end of the engine crankshaft. The clutch has two sheave faces; one that is laterally preset (stationary sheave), and one which can move out and in to engage the belt (moveable sheave). https://cvt08530.answerblogs.com/32530816/the-smart-trick-of-gearbox-cvt-that-nobody-is-discussing