The primary clutch is a sophisticated method of centrifugal clutch and is usually mounted into the output stop of your engine crankshaft. The clutch has two sheave faces; one that is laterally set (stationary sheave), and one that can transfer in and out to interact the belt (moveable sheave). https://johnathanpuuts.ampblogs.com/the-gearbox-cvt-diaries-69085215