A "dry clutch", as the name implies, is not bathed in fluid. Since the surfaces of a wet clutch can be slippery (as with a motorcycle clutch bathed in engine oil), stacking multiple clutch disks can compensate for the lower coefficient of friction and so eliminate slippage under power when fully engaged. Ducati motorcycles are probably the most common modern motorcycle found with dry clutches. Older CZs used to use dry clutches as well.
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