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  1. #1

    '04 XLT1200 tops out at 5000RPM, runs loudly.

    I have a 2004 Yamama XLT1200, since I've tried riding it this summer, it will run fine when I first get it in the water, accelerating as normal, over 5000RPM, speeds up to 59 MPH. However, once I turn it off and sit idle and start again, it won't go over 5000RPM, and tops out at around 25-28MPH. Also while doing this, it vibrates pretty hard and it gets very loud.

    So far I have changed the fuel filter, added some fuel cleaner, changed spark plugs and changed the battery as it had a deal cell in it. Problems still occur.

    I am a Jet Ski repair novice at best, I really don't want to pay a dealer to service it, unless I know exactly what's wrong and can't be fixed myself.

    Any ideas on what it could be?


  2. #2
    Hydrotherapy's Avatar
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    hi and welcome to GH

    from the 5000 rpm clue you have given i would look into the pv's first and make sure there cycling correct....

  3. #3
    How do I make sure they are cycling correctly?

  4. #4
    Hydrotherapy's Avatar
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    they should cycle when motor is first turned off i think..or ride with seat off and watch them open

  5. #5
    The power valves do cycle.

    Could it be electrical?

    It's exactly 5000 RPM, not even one notch above, seems too coincidental.

    And if I don't turn the engine off, I can ride perfectly. It isn't until I shut the engine off and back on when I get the problems?

  6. #6
    Mike xsockguyx's Avatar
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    Did you watch the powervalves open up? Or did you just listen to the motor? If not you can take the cover off the powervalves rev the engine up to 5000rpm and see if they actually move.

  7. #7
    Yes I did, I even installed a new power valve kit and still the same problem. The Jet Ski seems to run fine hooked up to a hose too, for some reason?

  8. #8
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by BiggNewt View Post
    I have a 2004 Yamama XLT1200, since I've tried riding it this summer, it will run fine when I first get it in the water, accelerating as normal, over 5000RPM, speeds up to 59 MPH. However, once I turn it off and sit idle and start again, it won't go over 5000RPM, and tops out at around 25-28MPH. Also while doing this, it vibrates pretty hard and it gets very loud.

    So far I have changed the fuel filter, added some fuel cleaner, changed spark plugs and changed the battery as it had a deal cell in it. Problems still occur.

    I am a Jet Ski repair novice at best, I really don't want to pay a dealer to service it, unless I know exactly what's wrong and can't be fixed myself.

    Any ideas on what it could be?
    maybe ignition

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