The primary clutch is a complicated sort of centrifugal clutch and is typically mounted on the output end on the motor crankshaft. The clutch has two sheave faces; one which is laterally set (stationary sheave), and one which can go out and in to interact the belt (moveable sheave). https://gearboxcvt76318.bloguerosa.com/31446779/a-review-of-cvt