The primary clutch is an advanced method of centrifugal clutch and is typically mounted to your output conclusion in the engine crankshaft. The clutch has two sheave faces; one that is laterally mounted (stationary sheave), and one that can shift out and in to engage the belt (moveable sheave). https://gearboxcvt54185.fireblogz.com/63663099/gearbox-cvt-options