The key clutch is a sophisticated kind of centrifugal clutch and is typically mounted for the output stop on the motor crankshaft. The clutch has two sheave faces; one which is laterally preset (stationary sheave), and one which can shift in and out to engage the belt (moveable sheave). https://gearbox-cvt65307.tblogz.com/the-gearbox-cvt-diaries-46139423