The main clutch is an advanced type of centrifugal clutch and is usually mounted to the output close on the engine crankshaft. The clutch has two sheave faces; one which is laterally preset (stationary sheave), and one that can go out and in to engage the belt (moveable sheave). https://gearbox-cvt19741.dsiblogger.com/65283164/gearbox-cvt-things-to-know-before-you-buy