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  1. #1

    Join Date
    Mar 2012
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    99 GP will not rev past 4000 rpm

    Hi guys, i have a yamaha GP1200 99 and it will not rev to full revs, it seems like it bounces on the rev limiter at 4000 rpm, every thing checks out fine mechanically, i really feel its an electrical issue, i have disconnected the over heat sensor but its still the same it just bounces on the limiter, if i dribble fuel into the carbies it will not pick up revs at all, just revs to 4000 and thats all.
    Thank you.
    Last edited by grumpy; 08-14-2013 at 09:37 PM.


  2. #2

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    Mar 2012
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    No one seen this before? is anyone able to link me to a test for the heat sensor for this ski, Thanks guys.

  3. #3
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Apr 2007
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    4000 rpm's in water or on trailer??
    Try on trailer to see if its the cdi limiting things.
    Do you still have choke plates installed?
    Any history on motor?? rebuilt,new,old,replaced some ignition stuff in the past?

  4. #4

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    Mar 2012
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    Australia
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    Hi Keyzbum, yes its on the trailer and feels like a cdi limiting thing for sure, it has a newly fitted motor, i have checked all the earths in the electrical box and all the connectors and all seem to be in good condition, yes it has also had a stator replaced and flywheel, i have checked these against the ones i have taken off and they are the same, i have checked spark on all cylinders and all are firing, im thinking its a faulty CDI unit or an over heat sensor causing the problem, i dont have access to any Yamaha manuals so any help would be great.

  5. #5
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    pm your email for a pdf manual .
    who replaced the stator?

  6. #6

    Join Date
    Mar 2012
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    Can you please send it to [email protected]m.au

    I replaced the stator with a new unit why do you ask?

    Thank you for your response.

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