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  1. #1

    New Kaw Ultra 300x cutting out at 5k RPM. NEED HELP

    Got a brand new ultra 300x. Took it out for the first time today. Ran fine for a very short time, but now it cuts out around 5k RPM and up. It's also only getting up to mid 50s. Anybody got any ideas what's going on? I have owned JetSkis for 20+ years so I am familiar with all the basics....
    FYI, ski only has about 1 hour on it.


  2. #2
    Take the time to smile sirbreaksalot's Avatar
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    Quote Originally Posted by Shelbyelite View Post
    Got a brand new ultra 300x. Took it out for the first time today. Ran fine for a very short time, but now it cuts out around 5k RPM and up. It's also only getting up to mid 50s. Anybody got any ideas what's going on? I have owned JetSkis for 20+ years so I am familiar with all the basics....what
    FYI, ski only has about 1 hour on it.
    What colour key r u using?
    Does it cut out or just not go any higher in the rpm
    What Rpm is the ski reving too?
    Waz

  3. #3
    I am using the fast key, not the "SLO" key, but I did try using the SLO key to see if it was any better and it was not. It feels rough around 5k rpm. Almost like its hitting a rev limiter. RPMs are not getting over 6k

  4. #4
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Check for loose hoses/clamps , check super charger belt ......

  5. #5
    Don't think it's the S/C belt as the boost is shooting up to max boost very quickly and staying high. Engine just seems to be cutting out at anything Over 5k rpm

  6. #6
    SAL08HO's Avatar
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    Sounds like you may have a boost leak, is the boost fluctuating?.. How many hours are on the ski?

  7. #7
    SAL08HO's Avatar
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    I see you have wrote 1 hour run time..check all the hose clamps and make sure there is no leak ..also the ski would do the same issues if the spark plugs are fouled (which I dont think with1 hour) or simply not tighten all the way. Check the basics first and if all else fails bring it back to the dealer ..

  8. #8
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Check for loose hoses and clamps.............

  9. #9

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    Quote Originally Posted by Shelbyelite View Post
    Don't think it's the S/C belt as the boost is shooting up to max boost very quickly and staying high. Engine just seems to be cutting out at anything Over 5k rpm
    I say take it back to the dealer.only 1 hour! I would`nt touch it.let kawasaki figure it out.

  10. #10
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    Change your plugs there fouled

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