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cvt continuously variable transmission driven clutch cvts are used extensively on snowmobiles mopeds scooters and some smaller motorcycles belt secondary clutch hub output shaft clutch spring secondary centrifual clutch weights clutch friction pads moveable clutch sheave low rpm idle rpm the drive clutch isn't spinning fast enough to force the belt outwards so the clutch spring in the driven clutch forces the belt to its outermost position in the driven clutch also since the driven clutch is spinning slowly the secondary centrifugal clutch weights are not flung out to contact the secondary clutch which is splined to the output shaft this allows the engine to idle while the wheel isn't moving medium rpm the drive clutch is spinning fast enough to force the belt outwards thus the belt is forced inwards in the driven clutch resisting the clutch spring also the secondary clutch weights are now spinning fast enough to contact the secondary clutch hub transferring power to the output shaft high rpm the drive clutch is spinning fast enough to force the belt all the way out thus forcing the belt towards the center of the driven clutch compressing the clutch spring even further the secondary clutch weights continue to be flung outwards and transfer power to the output shaft