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  1. #1
    PWCToday Newbie Yamaha runner's Avatar
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    Mar 2012
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    1994 Seadoo Gtx runs on trailer fine, but doesnt run in the water

    Hey guys, I have a 1994 seadoo gtx that runs fine on the trailer but the when i put it on the water , it runs for about 5 seconds and bogs down. I tried staring it before putting it in the water and then backing the trailer down and the second it hits the water it dies. The engine was rebuild this year and a bunch of other stuff was replace, has 120 psi of compression on both cylinders that was with a weaker battery , my high speed is set between 0 and 3/8, and my low speed at 1 1/4, spark is good, i checked my waterbox and nothing is cracked or loose, i dont smell any exhaust leaks. I saw on another forum that the 1995 gtx or xp has a faulty hose going from the wayerbox to the exhaust outlet that would collaspe in water and flood the engine out with exhaust gas. if anyone would help that would be awesome trying to get it done before a free ride

  2. #2
    PWCToday.com Is My Home Away From Home bills86e's Avatar
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    Re: 1994 Seadoo Gtx runs on trailer fine, but doesnt run in the water

    Your 657cc carburetors need rebuilt. 95's have a very different engine set-up. I diagnose this as Too much Air - Not enough gas.

  3. #3
    resident guru hafweigthr's Avatar
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    Re: 1994 Seadoo Gtx runs on trailer fine, but doesnt run in the water

    Compression on a 657 on a calibrated compression gauge should be 150+ should run OK down to about 135 if balanced. Who did the carbs and are you sure they are correct? Do you know the history of the ski that would help us with troubleshooting your problem E.G. was it running good before? , what was done during the rebuild?
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  4. #4
    PWCToday.com Is My Home Away From Home pwgsx's Avatar
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    Re: 1994 Seadoo Gtx runs on trailer fine, but doesnt run in the water

    ^ I was about to say, that is low compression. Should be 150. I would rebuild carbs with genuine kits, not the cheap e bay junk. Lastly check for spark on both plugs. I had a xp that drove me nuts and ended up being a bad plug boot.
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