Hi guys, I'm new here and new to jet ski's. I recently bought 2 jets, one is 1996 750 xi and 1992 750 ss. The xi has no power. It runs very slow like 5mph. It's like there is no power at all no matter how i squeeze the throttle. The SS runs good but it suddenly stops approximately after 10 min. The compression to both are good. I also checked their spark plugs and I believe they are good either because I saw sparks when I took them out and tried to push the start. I don't know what to check next. Please help ... Thank you.