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  1. #1

    Angry Drive Shaft vibration and noise also limp mode...

    I bought the ski and it ran fine the first two times I took it out on the water. I got it home after the second time and cleaned the motor up a bit and changed the plugs. Unfortunately I didn't tighten one plug down all the way and it backed out while riding. I'm assuming as this happened the ski went into limp mode because half way through my third ride it limped back to the dock. The ski hits a rev limiter now while in the water. Today I tried disconnecting the grey wire from the cdi, then the tan one, and there was another one near those two I disconnected. I even tried disconnecting them all at once and riding it but it still stayed in limp mode. Today I also noticed when I go to accelerate the drive shaft make a horrible clunking noise and when I take off the seat I can see it shake from side to side like an inch in each direction.

    I've done searches and found that it may be the fuel float or the stator but this is my first ski and have no idea how to check those.

    Any help would be great!
    Thanks


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome

    You have a mechanical problem in the driveline, with the driveshaft moving sideways. That needs attention. Remove the jet pump and inspect. See my signature links for how to do so.

    Do not disconnect wires in the electrical box unless you have a clear reason for doing so. Limp mode should trigger a red warning light on the display and a message indicating the reason for the warning. If no warning on the display then further diagnostics are required.

  3. #3
    While I was waiting on a response I messed with the MFD a little and got it to turn on. It has a red light blinking and says I have no fuel, the tank is almost full though. What should I be looking for as I take apart the pump assembly? Also water gets in the hull and there are no cracks on the underside. Any thoughts?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ricmagana View Post
    While I was waiting on a response I messed with the MFD a little and got it to turn on. It has a red light blinking and says I have no fuel, the tank is almost full though. What should I be looking for as I take apart the pump assembly? Also water gets in the hull and there are no cracks on the underside. Any thoughts?
    Would you be willing to tell us what model and year this watercraft might be?

    Is it a 1997 SLT 780 ?

  5. #5
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    You can remove the MFD to avoid limp mode.

    BUT YOU NEED TO DEAL WITH THE SHAFT ISSUES FIRST!

  6. #6
    BlueFishCrisis's Avatar
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    My guess is that the bearings in the pump and thru hull are shot, the drive shaft is wobbling around like crazy, and all of the chaos is ventilating the pump causing the motor to rev freely and hit the limiter at 6800 RPM. If you haven't experienced limp mode vs ventilation you wouldn't know the difference.

    As K447 said, time to pull off the jet pump, inspect it, the 5 vane pump stator, the impeller, the drive shaft, and the thru hull bearing carrier for wear. Also check that the ride plate and intake grate are all properly fastened and sealed to the hull.

  7. #7
    BlueFishCrisis's Avatar
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    Quote Originally Posted by K447 View Post
    Would you be willing to tell us what model and year this watercraft might be?

    Is it a 1997 SLT 780 ?
    Based on his description, I think you might be right

  8. #8
    Yes it is a 1997 slt 780, sorry.
    Ok I'll look into the shaft issues today after work.

  9. #9
    BlueFishCrisis's Avatar
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    Quote Originally Posted by ricmagana View Post
    Yes it is a 1997 slt 780, sorry.
    .
    Click image for larger version. 

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  10. #10
    When I remove the pump assembly what am I looking for exactly?

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