The first clutch is an advanced type of centrifugal clutch and is usually mounted on the output stop of the motor crankshaft. The clutch has two sheave faces; one that is laterally fastened (stationary sheave), and one which can shift out and in to engage the belt (moveable sheave). https://gearbox-cvt19631.wssblogs.com/32344359/the-definitive-guide-to-gearbox-cvt