I recently bought a 900 motor and swapped it for my 750. Now that it is all together, I'm having trouble moving lol. When I put the bike in gear and let the clutch out, it slips big time and I barely move. I feel as though it is not the clutch though because the motor has very few miles. Is the piston thing that bolts on the left side of the motor (actuates the clutch) interchangable from 750 to 900 motors? I used the one from the 750.