The simple answer is a CORRECTLY fitted, CORRECTLY designed, CORRECTLY manufactured, CORRECTLY hard anodised dry running belt system employing a diaphragm spring clutch which being CORRECTLY designed manufactured and hard anodised will weigh in total about 61/2 lb. You then end up with a clutch that .....
1. does NOT slip when fully engaged, even when hot.
2 frees off instantly without drag whenever required, even when hot.
3 is EASILY operated by the user at all times.
4 possesses the LIGHTEST rotating weight reasonably possible.
However the use of a Commando type clutch, standard AMC lift mechanism and a 7/8 inch clutch lever does not reallyresult in enough lift at the clutch plate interfaces to allow good seperation with a clutch employing 4 friction plates and thus good drag free freeing off. it is just about minimal. Using a 1 1/16 inch centres clutch lever increases the lift enough to give good seperation with 4 friction plates but increases the grunt required to operate the clutch lever but it should still be a reasonably easy two finger operation.
The big problem is obtaining the CORRECT bit..... I doubt there are many belt system manufacturers who can even manage a few simple clutch torque calculations so as to manufacture their clutches correctly .....certainly a few clearly know much if anything about belts!!
