The first clutch is an advanced form of centrifugal clutch and is often mounted on the output stop of the engine crankshaft. The clutch has two sheave faces; one that is laterally fixed (stationary sheave), and one that can go out and in to interact the belt (moveable sheave). https://felixoppol.blog2freedom.com/32329615/gearbox-cvt-things-to-know-before-you-buy