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  1. #1
    Too many toys, not enough time snoopy'sbitch's Avatar
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    1996 sl780 wont rev past 4000

    Hey everyone, just wondering what could keep one of these skis from reving up. I have full gas and half a tank of oil. No warning lights on the MFD. If i disconnect the battery, and start it up, it screams. After i try to restart it again, its back to limp mode. Any ideas? It is on my trailer, adn not in the water....yet


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I was recently schooled about the MFD possibly causing issues.

    Try disconnecting the MFD from the harness as a test.

    Let me know what happens.

  3. #3
    Too many toys, not enough time snoopy'sbitch's Avatar
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    Wow, I would have never thought of that. Ill check tomorrow, since I have them at work. Thanks for the info, because I keep wondering why sometimes it will rev after i disconnect the battery. i guess the mfd is in charge of limp mode? I bet that is my problem. Thanks alot, ill keep you informed

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I didn't think the MFD had anything to do with it, just a display. But K447 had a guy disconnect it, and it solved his problem.

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    Too many toys, not enough time snoopy'sbitch's Avatar
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    Of course, this is speculation at this point, but if it is the MFD, is there a wire that I can cut that will not keep it in limp in mode. I bought a used MFD from a fellow greenhulker, and kinda would be upset if I again had a non working display. Maybe Ill study the wiring

  6. #6
    Too many toys, not enough time snoopy'sbitch's Avatar
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    Well the MFD is not the cause. I assume the only thing else would be a bad CDI. So for now, i disconnected the gray wire. I will have to keep an eye on things

  7. #7
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    disconnecting the battery

    is a sure fire way to melt down your cdi box. The battery is an important part of the voltage regulation system. You'll find the wire that triggers limp mode on the wiring diagram for your ski, clip that. Possible that your red light is burned out? ( or is it an LED..never checked it)

    ground the overheat switch and see if it blinks

  8. #8
    Too many toys, not enough time snoopy'sbitch's Avatar
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    Quote Originally Posted by nmpeter View Post
    is a sure fire way to melt down your cdi box. The battery is an important part of the voltage regulation system. You'll find the wire that triggers limp mode on the wiring diagram for your ski, clip that. Possible that your red light is burned out? ( or is it an LED..never checked it)

    ground the overheat switch and see if it blinks
    What i meant was I would start the ski, and it would be in limp in mode. I would shut ski off and disconnect battery and wait 5 min, like I was resetting a computer. Id plug battery back in, and it would rev beautifully. I'd shut it off and restart it again, and back to limp mode. The red light works, and temp switch as well. I tried to unplug MFD, and it didnt help. Only thing I can think of is CDI is flaky

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Or the LR 54 is starting to fail. (grounding internally)

    Try John Zigler for a replacement. Should be around $20-30 I think.

  10. #10
    Too many toys, not enough time snoopy'sbitch's Avatar
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    Quote Originally Posted by xlint89 View Post
    Or the LR 54 is starting to fail. (grounding internally)

    Try John Zigler for a replacement. Should be around $20-30 I think.
    I googled it and searched in the forum. Whats lr 54?

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