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1997 Sea Doo GTX

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  • 1997 Sea Doo GTX

    Hi All. Hoping I can get some help with my Sea Doo. Was running great and suddenly died while my daughter was riding it. She said it just suddenly stopped like the lanyard had come out. Couldn’t get it started again.
    I’ve been running premium fuel with sea foam added.
    It turns over fine, has spark (plugs are new)and will start if I spray gas in the cylinder.
    I figured a fuel delivery problem. I have taken the carbs apart and cleaned, bought a carb kit and rebuilt fuel pump, replaced fuel lines, checked filters, emptied and cleaned fuel tank, by-passed fuel selector switch and straight to carb from tank and am pretty confident no leaks in fuel lines.
    I have not done a compression test. Was told by previous owner that it was 120 and 130. If this is the case would that be acceptable.

    Any thoughts or ideas on what to check or try?


  • #2
    with sea foam


    will start if I spray gas in the cylinder
    Has to be the fuel delivery issue if it starts with spraying gas in. Check fuel pressure going into the carb
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      Thanks. That was what I thought. Fuel pump is in carb so fuel lines from tank to carb are in a negative pressure. I got to where I thought it had to be air getting in. I disconnected the line at the tank and put a compound gage on it then turned the engine over. Fuel pump pulls and holds a vacuum of about 2”.
      Is a weak spark a possibility?

      Comment


      • #4
        Do you still have the gray fuel lines in there? If so, those need to go. There is a chemical reaction with ethanol, those fuel lines, and brass. Green slime forms, then hardens, and it will cause continuous problems until they are changed out. A complete carb clean and rebuild is required, specifically the filters in the carbs. You have 2 carbs in there, the fuel pump is on the magneto side, no fuel pump on the PTO side. Buy Mikuni OEM rebuild kits only. There are known issues with aftermarket sizes that don't create a perfect seal.

        I just did my 97 GTX, took about 6 hours total for everything, and I was taking my time. It runs like new right now. PM me if you need help, part numbers, or advice on re-build kits (FYI, you won't find the '40' kit for your carb there is a combo 38/44 kit you buy that has all the parts you need except for the pop off spring, which you can re-use the factory one).

        Comment


        • #5
          Thanks for the replies.
          I cleaned and rebiult the carbs with mikuna carb kit. Also all the grey fuel lines are have been replaced. Honestly though i didnt find anything plugged up.
          i find it odd that it suddenly went from running great to not running at all.
          I'm sure there is fuel to the carbs just dont know whats happening from there. Thought for sure after everything else it had to be air getting in to the fuel line but am now pretty confident I've ruled that out.

          Comment


          • #6
            The compression numbers you listed are acceptable, brand new or after a top end re-build, they would be 145-150, A little concerned at the variance but it is within range.
            I would go through the carbs again, specifically, the 3 tiny idle holes. It took me awhile to get those cleared. Also check the 2 check valves in the carb. If those are reversed, no fuel will get through.

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            • #7
              Have you ruled out the canister filter in the front hatch?

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              • #8

                For test purposes I ran a new line from the tank to the carb. So by passed everything including the cannister filter.
                i think your right about going through the carbs again. I was pretty focused on the fuel pump and could very likely have missed something.
                i have them out and on the bench anyway.
                will post what i find.
                thanks again. I appreciate the help.

                Comment


                • #9
                  I took the carbs apart again, cleaned them and made sure everything was good. Didn’t feel like I found anything. They seemed clean. I have not had time to put them back in yet. Hopefully tomorrow. Will update then.
                  Thanks, Mike

                  Comment


                  • #10
                    Sign up today
                    Here is a hope for a good run
                    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                    07 Seadoo GTX
                    Merc Adults Only VP Adults Only
                    G-Dad always said "First Liar doesn't stand a chance"

                    Comment

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