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Missing exhaust sealing rings

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  • Missing exhaust sealing rings

    Hello gurus,
    I have just replaced the lower exhaust in my stx15f and didn't know about the sealing rings. What happens if they are not installed? I'm guessing they are needed.
    Thanks for any help.

  • #2
    Yes. You must have them in order to stop exhaust leaks in the hull.


    • #3
      The rings aren't one of Kawasaki's better ideas, IMO. They are tight fitting and the least amount of corrosion will bind them and prevent sealing. I would install them (but they are a pain to get in place) but it will run without them too.
      2018 GTR-X 230
      2004 STX-15F race ski revived in 2016
      1998 GTX-RFI-original owner


      • #4
        I don't know, as I've never tried to run without them. That said, I think that you would get leakage that may burn a hole in the blue hose.

        I've found that it's easier--no, less difficult--to remove the exhaust manifold, put the rings on the 4-1, slide the blue hose over the muffler inlet pipe, then slide the 4-1 into the muffler. Now, try to bolt the manifold to the 4-1, then bolt the manifold to the engine. Tighten the hose clamp last. I've done an STX-15F and an Ultra LX and found the STX was easier--well, less difficult and I lost less blood.
        '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)
        '99 Yamaha Exciter 270 (Boat)
        '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!


        • #5
          Thanks all.