Have you gone through this?
IMPORTANT: Break in period for this supercharger is 3-4 hours. Check and/or adjust the slip on the SC shaft after 3-4 hours of operation after installation. Please refer to your Sea Doo service manual for this procedure. The slip moment setting for the Riva XXX-2 should be 15-18 foot lbs. For optimum performance, inspect/adjust the slip again in 10-20 hours (depending upon application & water conditions). Once you have noticed the slip has stabilized, you may go longer between slip inspections.