Welcome to the seadoo forum Jesskidoo. Well you have a small project on you hands if you want to go from end to end and get that seadoo up to par for the water. It sounds like your on the right track already. Fresh fuel, cleaned carbs, new spark plugs and a new battery. Did you make sure you have no air bubbles in you oil injector lines, after replacing your injector oil? Do you get 2 beeps when you attach your lanyard on the DESS, (Digital Electronic Security System)? On the back of the engine is a black boot that covers the impeller going to the impeller. There is a grease fitting there. Pump synthetic grease in it till you feel friction. That model has RAVE, (Rotax Adjustable Variable Exhaust) valve system. These should be cleaned annually. I would get it fired up first and see how it runs first, and go from there. If you want to jump in you might want to join as a "Premium Member". Here is some info on being a premium member;
As premium member you can down load a authentic seadoo manual from the seadoo manual library. In the library is a variety of manuals for almost all years and models. You can view as many as you like on line as a PDF file, or download it and print it for your personal and privet use. There are operator manuals and repair manuals for you to do your own repairs on your seadoo. The repair manuals have everything from troubleshooting, repair procedures to winterizing. It contains wire diagrams torque specs and pictures for disassemble and assemble instructions. In the spec sheets it tells everything needed to maintain oil changes, spark plug gaps and impeller wear ring tolerances. Click on the "Seadoo Manuals" link at the top of the page for more details. If you need any help or get in a jam, we are always here to answer your questions too.
Karl