Purchased 2001 RX Di Seadoo this year. In June the drive shaft broke. Some wear on the splines, but I would not say excessive for the year. Had drive shaft, pump and impeller replaced. Repair shop said they ran the ski and all was fine. However on my first outing the splines on the pump end stripped. Can anyone try to explain what would cause this? Repair shop owners said it was my holding throttle open when hitting waves. I have since had all the parts replaced by another shop and I have not had any trouble.