I have a 96 Seadoo Challenger that just won't get out of the water. I replaced the impeller and boot, and wear ring. I just re-did the top end, sealed the jet drive to the hull, and checked all the hoses and connections. Nothing is bent or damaged or otherwise visibly wrong, but now I am getting an oily residue in the engine compartment and when I punch it from a standstill, it revs up to 7000+rpm but won't move more than about 10mph and takes it's time getting there. What else could it be?