I recently rebuilt the lower half of my '75 CB360 engine (cracked the cases, etc.) and I'm now in the process of remounting the engine and putting everything back together. When I put the clutch plates back in, I noticed something weird: with the engine in neutral, the real wheel spins normally if the clutch plates aren't in. If I put them in, there's so much drag the wheel barely spins; if I apply any pressure to the plates (far less than would be applied by the springs and the pressure plate), the wheel becomes impossible to move. These are new friction plates and springs from Common Motor and I've just soaked them in oil for 48 hours. I also made sure all of the clutch B plates are facing the same way. Is there something obvious I'm missing?