The first clutch is an advanced kind of centrifugal clutch and is often mounted towards the output stop in the engine crankshaft. The clutch has two sheave faces; one that is laterally set (stationary sheave), and one that can go out and in to engage the belt (moveable sheave). https://cvt10852.blogprodesign.com/53940471/the-smart-trick-of-gearbox-cvt-that-no-one-is-discussing