Okay, made it a broad sounding question, but this is rather specific. I have found manual clutches for small displacement engines. There are even exploded transmission parts diagrams I have found, but still no answers. My question is, what is pushed or pulled in these to release spring tension and release the clutch packs? These are designed to work on lifan engines, 50, 90 and 110cc engines. I understand that in a clutch for a car the spring pressure is released by pressing in the throwout bearing. I do not understand what is going on with the lifan clutch.