The first clutch is a sophisticated form of centrifugal clutch and is usually mounted to your output end in the motor crankshaft. The clutch has two sheave faces; one which is laterally fixed (stationary sheave), and one which can shift out and in to engage the belt (moveable sheave). https://gearbox-cvt10864.elbloglibre.com/32289378/5-simple-statements-about-cvt-explained