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  1. #1
    steve113's Avatar
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    Surging is back after supercharger rebuild

    At 76 hours the ski starting surging @ WOT. Would almost feel like I was being held back by a rubber band, then it would just come to life and hit max RPM's and 69-70 MPH. I changed the oil and spark plugs and the ski has run perfectly with no surging. @ 107 hours I had the supercharger rebuilt by Jerry. After installing it I took it out to make sure everything was fine, and the surging is back. It comes and goes and seems to get stuck at around 6800-7200 RPM / 58-62 MPH, then will just clear up and hit max RPM/MPH. Do these spark plugs go bad that fast or is it something else? Everything else on the ski has been checked out and is fine. I've searched the forum and seen related problems but most people don't post up what their fix was for the problem.


    2006 RXP


  2. #2

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    injectors may need cleaning.

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  4. #3
    warsawspeedfreak's Avatar
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    If you look on ebay probably find a whole set for 50 buck because somebody upgraded to 42's just a thought.

  5. #4
    Moderator beerdart's Avatar
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    Also inspect your coils for cracks in the plastic sleeves.

  6. #5

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    I've had this problem if the key has a bad connection with the DESS post. Could also be water in the fuel, FPR going out, fuel pump going out, loosing spark/bad plugs, sticking injector.

  7. #6
    Got Boost? psycho rxp's Avatar
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    Could have a leaky intercooler, or coil packs, could be cracked, and arc-ing inside the tubes.
    Could have something blocking the exhaust inside the waterbox.
    Exhaust leak, or fuel pump pressure problem Etc...Etc...

  8. #7
    steve113's Avatar
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    Quote Originally Posted by jim View Post
    injectors may need cleaning.
    They were fine before the sc rebuild..

    Quote Originally Posted by beerdart View Post
    Also inspect your coils for cracks in the plastic sleeves.
    I took a look at them and they are still nice, clean and greased from the last time I replaced the spark plugs.

    Quote Originally Posted by ironman_gq View Post
    I've had this problem if the key has a bad connection with the DESS post. Could also be water in the fuel, FPR going out, fuel pump going out, loosing spark/bad plugs, sticking injector.
    What did you do about the key problem, I haven't look at this yet. The ski sat for 2 months while I was oversea's, and the fuel tank was about 3/4 full, could be bad fuel now that I think about it. How often should we be replacing the fuel filters, both internal and external?

    Quote Originally Posted by psycho rxp View Post
    Could have a leaky intercooler, or coil packs, could be cracked, and arc-ing inside the tubes.
    Could have something blocking the exhaust inside the waterbox.
    Exhaust leak, or fuel pump pressure problem Etc...Etc...
    I've read about the intercooler but it cleared up last time I did the oil change and tune up. I plugged off all the ports when the s/c was out so nothing could get in there and I checked them clear before attaching anything.
    I think I'm starting to lean towards a fuel problem.

  9. #8

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    The key fixed itself next time I was out, I took a hard bounce off a wake and halfway pulled the key loose, didnt think anything of it cause it didnt kill the ski, I just kept riding but I noticed that it was surging and loosing power pretty bad. Pulled into shore and noticed the key was barely on, stuck it back on properly and went back out without problems. I have had one worn out key do this as well, it would wiggle around and cause problems. Had a new one flashed and everything is better.

  10. #9
    Moderator Snoman's Avatar
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    Did you check all your hoses for leaks,cuts or holes????Sometimes Scer surge can be caused by a leak or hole in the system..

  11. #10

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    I would change your plugs again if this works check your ic for leaks. Could be water fouling your plugs

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