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  1. #1
    Biggsw784's Avatar
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    1997 Polaris SLT780 issue

    I have a 97 SLT780 that I am having issues with. On the trailer it starts up and revs awesome to about 6700 rpms but once in the water it will not go over about 4000 rmps. It has about 140 psi in all the cylinders and I just had the carbs off and checked all the diaphrams and blow through all the high/low speed circuits and main jet circuit. I really dont think fuel is the issue here. The display hasnt worked in years and I replaced the fuse and it is working now and it is telling me that it has low fuel even though it has a full tank. I had this issue before I got the MFD to work so I am figuring thats not the issue either?? Is this low fuel thing putting it into a "limp mode" or something?? What I dont get is thats it hits 6700 rpms out of the water?? Any help is greatly appreciated!!!


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    You can replace the fuel float to correct the constant Low Fuel warning. In the meantime you can disconnect the fuel Snyder wire inside the electrical box. That will stop the red lamp warning.

    Does this engine still have the original ignition system or the Update Kit installed?

  3. #3
    Biggsw784's Avatar
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    I am assuming the original one man??

  4. #4
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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    Quote Originally Posted by K447 View Post
    You can replace the fuel float to correct the constant Low Fuel warning. In the meantime you can disconnect the fuel Snyder wire inside the electrical box. That will stop the red lamp warning.

    Does this engine still have the original ignition system or the Update Kit installed?
    Its a Fuji 780, not a Domestic.

    I have the same problem with my 96 SLT780, still at a loss.

    The 97 780's are only rev limited for heat. Id grab a manual and start checking the electrical system if you don't think its fuel related. Stator tests are easy to do.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    No load on the engine out of water, so it'll rev really easily.

    what are your carb screws set at?

  6. #6
    Biggsw784's Avatar
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    on the low its 1 1/2 turns out and on the high its 1 1/4 out

  7. #7
    BlueFishCrisis's Avatar
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    Quote Originally Posted by Biggsw784 View Post
    on the low its 1 1/2 turns out and on the high its 1 1/4 out
    Manual states lows to be a 1 1/4 out with highs 1/8 out +/- 1/8...... That doesn't sound like much, somebody please check me on that!

  8. #8
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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    Quote Originally Posted by BlueFishCrisis View Post
    Manual states lows to be a 1 1/4 out with highs 1/8 out +/- 1/8...... That doesn't sound like much, somebody please check me on that!
    Sure as hell did not sound right, but I checked and you are!

  9. #9
    Biggsw784's Avatar
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    Is the high speed screw on top of the carbs isnt it?? I hope I didnt get them switched around in my head?? LOL

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    High speed mounted hi on the carb

    Low speed mounted low on the carb

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