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  1. #1

    Join Date
    Jan 2013
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    Fuel coming out of exhaust 99gp1200

    Hey guys new to site and the jetski world
    recently purchased a 99 gp1200 and seemed to run ok but on my last outing it was running quite poorly would not go over 35kmh and bogged down when taking off so when I got it home i checked plugs and seemed ok so i cranked it over with plugs removed and it shot water/fuel out of all 3 cylinders (about a cup full). Reinstalled plugs and started it up and it had about 2-3 cups of water come out the exhaust even though i had blown it all out at the ramp but the strange thing was it smelt like fuel so i got a rag, soaked some up and it lit on fire. Im not sure on the condition of the carbs and havent tested compression, but spark did seem on the low side. Im quite a novice when it comes to 2 strokes but have played with car motors a bit and was hoping there were some basic stuff I could play with and check before i send it to a mechanic. Also where i could purchase gasket kit/carb rebuild kits ect online as i live in Australia
    Any advice appreciated and thanks in advance Kory


  2. #2
    Yamaha artisan Cutlass's Avatar
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    Oct 2010
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    If you have water in the cylinders, then you might have a leaky head gasket. If you have a lot of fuel in the cylinders and exhaust, then the needle/seats might be leaking fuel.

  3. #3

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    Thanks Cutlass think i may be due for a carb rebuild and I might even give it a go myself with all the handy info on this site. Also found I had a faulty ignition lead, so ill fix that and see if that helps my situation

  4. #4
    Moderator OsideBill's Avatar
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    I would say the needle is staying open this can happen when the return orifices clog in the carb body, the fuel pressure increases and causes the needle valve to stick open.

  5. #5

    Join Date
    Jan 2013
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    Thanks Osidebill definatly will rebuild carbs then and even if thats not the issue it wont hurt to do it.
    thanks for the help guys

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