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Thread: Yamaha GP760

  1. #1

    Yamaha GP760

    I have a 1999 GP 760 that has had starting issues lately, tough to start, alot of gurgling and smoke while turning over. Then when you do get it started it crawls, and wants to stall when you pull the throttle. Sometimes it does get going, but not the performance it used to have. When you back off the throttle wants to stall. I changed the plugs, even emptied the oil tank thinking the oil was bad. Took air box off and cleaned the carbs with spray cleaner wiped it all down. Still problem. Little bit of water at the bottom of ski, maybe 1/8" inch. Love it, don't want to see it go down the road. Hope you all can help.

    Thanks!


  2. #2
    mrbtd's Avatar
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    Sounds like its time to have the carbs rebuilt.

  3. #3
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    I recommend rebuilding the carbs. Do a compression test also.

  4. #4
    Yes, the rebuild did come to mind, but the problem came on so quick that it's hard to believe the carbs went bad that quick?

  5. #5
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Do a compression test just to rule out it is not something major. I don't know for sure if there is an adjustment on the oil injection (I always premix), but if its supplying too much oil that could explain the excessive smoke. Others may know for sure if the oil injection can be adjusted.

    It could be something electrical.

  6. #6
    cheatin' piston popper addicted's Avatar
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    as these guys said, check compression first. Should be around 150psi each jug. Rebuild the carbs with genuine mikuni kits. Check the popoff. Pull and inspect the reeds while the carbs are off. Change the plugs, and if the plug boots on that model are removeable, remove them, clip 1/4" off the ends of the wires and reinstall. The OE service manual is available for download in the yamaha how to section.

  7. #7
    Thanks guys, I'll give it a whirl!

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