I have 1996 Seadoo xp. I recently installed new pistons and rebuilt the carb. Compression is 150+psi. The ski starts up no problem on trailer. When I put it in the water it just cranks and it won't turn over. If I put it back on the trailer it starts right up. Could the jet pump be bad? The prop is rotating. The ski was negelected for about 3 years. I have replaced almost everything but the jet pump. The battery and plugs are new. Thanks!