The key clutch is an advanced sort of centrifugal clutch and is typically mounted on the output finish of your 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://gearbox-cvt55319.liberty-blog.com/32441086/gearbox-cvt-options