The key clutch is a complicated type of centrifugal clutch and is often mounted towards the output close from the engine crankshaft. The clutch has two sheave faces; one which is laterally set (stationary sheave), and one which can shift out and in to engage the belt (moveable sheave). https://gregoryopmjg.ageeksblog.com/31401064/5-simple-statements-about-gearbox-cvt-explained