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My 2010 kawi stx 15f has vapor coming out the tail pipe

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  • My 2010 kawi stx 15f has vapor coming out the tail pipe

    Is this normal. After a long ride I notice smoke after flushing. The vapor rises about 7 ft and disappears. All compression is at 151 when cold. Replaced exhaust manifold gasket with kawasaki OEM. Ans it looks like this ...

    different angel

  • #2
    Looks like water vapor, just steam from the exhaust cooling via water injection?
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    • #3
      I'm surprised to see vapor coming from my 15F while on the water, compared to my Sea-Doo. I'd say your exhaust looks normal but why did you replace the exhaust manifold gasket?
      2018 GTR-X 230
      2004 STX-15F race ski revived in 2016
      1998 GTX-RFI-original owner


      • #4
        It was aftermarket and I crushed it a few times. I thought it could be compromised so i replaced it with OEM.


        • #5
          Let's see...

          Basic chemistry, when you burn gasoline, you're mixing C8-H18 (or something near that) with O2. This results in CO2 and H2O, i.e. water vapor. Hello!
          '15 Kawi Ultra 310X
          '99 Kawi Ultra 150 (2)
          '10 Kawi Ultra LX, '13 Kawi Ultra LX, '13 Kawi Ultra LX parts 'Ski
          '04 Kawi STX 15-F, '06 STX 15-F (2)
          '91 Kawi Jet Mate
          '97 Yamaha Exciter 220 (Boat)
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          '78 Nacra 5.2 Catamaran
          '05 Windrider WR-10 Trimaran, '05 Windrider WR-16 Trimaran
          ... and that's just the boats! I'm living proof that you can have too many toys!