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  1. #1

    2003 STX-R 1200 Underload

    Hi Guys i have just bought a 1200 stxr, took it out today first time. Ran completly fine for about 20 mins then all of a sudden it, lost all its power.

    Came back in out of water, revs up fine, water lose power under load any ideas??


  2. #2
    785xp's Avatar
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    Where are you located? I was looking at buying one as well?

  3. #3
    jonny5's Avatar
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    Change the plugs and start with something simple. If no go then start with diagnostics like compression....

    And more basics like enough fuel, where is the fuel selector?

    OK well start with that and get back.

    If you dont have a compression gauge then take a rag ...place it over the spark plug hole with all 3 plugs out.... place your thumb over the rag and crank it over. Do this for all three. If it quickly pops your thumb off on all of them it's probably not a porblem. If you can keep your thumb over one while turning it over probably have a bad cylinder.

    Also look in the engine compartment at the bottom of the motor with a flashlight and see if you see some parts down there... I have read some that it runs but the case is blown out from bottom end failure.

    How long was the ski sitting...??

  4. #4
    slowteg97's Avatar
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    could be a bad cdi box also. i ran into that a few times with yamahas and it would do the exact same thing.

  5. #5
    SPEEDFREEK SPEEDFREEK's Avatar
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    Really need a compression check on this one. Ultra did the same thing and found #2 piston fried.

  6. #6
    jonny5's Avatar
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    Dont really need a compression gauge to see if piston is shot ..thumb trick works fine. If the piston is good then it will pop your finger right off. If it's a dead hole you will be able to leave your finger on it....

    If thats the case tear it down.

    The cdi boxes rarely go out in these things. If ever..

  7. #7
    SPEEDFREEK SPEEDFREEK's Avatar
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    i learn something new every day.

  8. #8
    jonny5's Avatar
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    Speedfreak ....if you have a dead hole it's easy to check with out a guage ...but if your ski is soft and you think it is not running to it's potential then maybe something happened ...and then a gauge would be handy.

    Because you may find something like,.... 125 ,125, 95.. And 95 will probably still pop your finger off. Maybe not as with much force but if not really trained or experianced with the procedure then may not notice the differance.

    Hope this little tip helped.

  9. #9
    SPEEDFREEK SPEEDFREEK's Avatar
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    It has indeed.

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