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  1. #1

    780 wont plane out

    Ok i have a 97 780 and it has been sitting awhile. So i had the carbs rebuilt with new mikuni carb kits new plugs, fuel line, fuel pump. It starts and runs great. When i accelerate in the water in goes ok not fast like it should once i hit some waves and kinda jump up while hitting the waves it goes faster and faster until im full speed 6500 rpm and movin. I guess its not planing out until i get it out of the water. Dont no where to start next. Thanks


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    What impeller is installed? And what's your gap between the impeller and wear ring?

    Can you tell if the intake grate and ride plate were siliconed?

  3. #3
    Not sure what impeller looks the same as my other 780. And i dont see silicone On the intake grate or ride plate. Is there suppose to be? And what is the gap supose to be.

  4. #4
    BlueFishCrisis's Avatar
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    Quote Originally Posted by jdogg View Post
    Not sure what impeller looks the same as my other 780. And i dont see silicone On the intake grate or ride plate. Is there suppose to be? And what is the gap supose to be.
    The Intake grate and Ride plate should be siliconed to the hull to prevent any air or air bubbles from getting into the pump tunnel. This greatly reduces thrust and can complete reduce thrust.

    Is the pump tunnel clear of any and all debris?

    Impeller to wear ring clearance should be less than .020 all the way around.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    What RPM are you seeing?

    Impellers look alike, but we need to know the numbers stamped on it to be sure.

    Yes, the intake grate and ride plate must be siliconed to the hull to prevent cavitation.

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