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1998 Yahama GP 1200

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  • 1998 Yahama GP 1200

    Okay new two the jet ski world and just would like some advice. So I took the Ski out monday ran really good. Took it out the next week and ran like crap. Found out there was a decent amount of water in my tank, So I dumped out the tank and changed the filter. Took it back out to the lake the next day and still wouldn't run good. So i took the filter out and blew threw it a few times still has some water, but now i have zero water from the tank to the filter and it still runs like crap.

    Question number 1- Is there any way on these that water can some how get sucked into the tank?

    Question #2- Should I tear the carbs down at this point and just rebuild them? or what else should I try to get it to run right again.

    I can get it up to about 7MPH and thats it. you can feel sometimes it wants to take off but falls on it face. I checked compression it was 120 at every cylinder as well.

    Thanks for any help!!

  • #2
    1. Loose gas cap, damaged seal on the cap or a crack in the cap.

    2. Yes, you should open them up and check for water. If it ran 'really good', I wouldn't do anything to them except get the water out. Be careful not to damage any gaskets. If you do, the put kits in them. Use ONLY Genuine Mikuni parts!
    '15 Kawi Ultra 310X
    '99 Kawi Ultra 150 (2)
    '10 Kawi Ultra LX, '13 Kawi Ultra LX, '13 Kawi Ultra LX parts 'Ski
    '04 Kawi STX 15-F, '06 STX 15-F (2)
    '91 Kawi Jet Mate
    '97 Yamaha Exciter 220 (Boat)
    '99 Yamaha Exciter 270 (Boat)
    '78 Nacra 5.2 Catamaran
    '05 Windrider WR-10 Trimaran, '05 Windrider WR-16 Trimaran
    ... and that's just the boats! I'm living proof that you can have too many toys!