The first clutch is an advanced form of centrifugal clutch and is usually mounted to your output end from the engine crankshaft. The clutch has two sheave faces; one which is laterally fastened (stationary sheave), and one which can move in and out to engage the belt (moveable sheave). https://gearbox-cvt20751.total-blog.com/not-known-details-about-gearbox-cvt-57629284