I have a Rizzato Califfo that uses a wet clutch. I currently have the top end off along with the engine side covers. If I spin the peddles fast enough the clutch engages and the crank starts turning, but if I hold the crank rod I can turn the peddles as fast as I am able and I get no movement on the crank. I took the back of the clutch plate off (large C-clip) and I can see the clutch shoes and they look like they have a good amount of pad on them yet. So, my question is does the crankcase need to be filled with oil for the wet clutch to work properly?