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  1. #1

    Top speed slow- '97 1100 STX

    So I recently bought a 1997 Kawasaki 1100 STX. Awesome ski. The guy I got it from winterized and it started right up last week without an issue. It's been running great with one small issue. I cannot get the top speed above 35.4 mph (measured by GPS), 32 mph on the speedometer. Unfortunately the '97 does not have a tach on the computer so I cannot tell where the rpms are, however, it sounds like it is not reaching full rpms. It's fast out of the hole but from about 1/2 throttle to full throttle there is little change in speed or rpms. It runs great otherwise. No sputtering, no bogging out, no cutting out. I've run it probably 5 hours and two tanks of premium gas with carb cleaner since getting it and there is little change in performance. I changed the plugs as two looked a fouled but there was no change in performance.

    I am not mechanically inclined but my instinct is that I am having some type of fuel delivery issue. I looked at the fuel filter today and it had about half gas and half air. It looked clean through the translucent case but I did not remove it and clean. I bought a compression gauge and will test that tomorrow or the next day. Any other suggestions in the mean time? Thanks!


  2. #2
    Hey medic2491, have a stock '98 stx 1100 best i've got was 54 (on speedo) glass water on Sebago Lake Me.

  3. #3
    I'm on glass water in a pond in RI. Best on the speedo is 32 mph, 35.4 mph via handheld gps. Thanks for the info though!

  4. #4
    DavidR's Avatar
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    The fuel filter will never be full of fuel, so don't use that as an indicator.

  5. #5
    steve45's Avatar
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    Yep, start with a compression test. Like David said, the filter should not be full.

    No need to run premium fuel unless the compression ratio has been altered.

  6. #6
    Bnelson's Avatar
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    Make sure when you do the compression test that you have a fully charged battery. Also make sure to hold the throttle open when cranking. It will be easier to help with the problem if we can eliminate low compression.

  7. #7
    Thanks for the replies! I did the compression test this morning-- 115 psi across all three cylinders. However, I noticed that the same two cylinders that had fouled plugs before had what appeared to be fouled plugs again (black, oily, carbon). The #3 cylinder plug (furthest from the front) was the worst, #2 was a little less black and oily, and the #1 was as clean as the day I put it in. Weird. Does this information help narrow it down? Thanks again.

  8. #8
    DavidR's Avatar
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    Clean as in looked brand new? That's not a good thing. It would mean that it's not getting any fuel or oil. That would also account for your reduced power, as you are only running on two cylinders.

  9. #9
    steve45's Avatar
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    The clean plug isn't firing. Either it's not getting fuel, or it's not sparking. Is it wet?

  10. #10
    Everyone who said the clean plug wasn't firing is correct. I had no spark on that cylinder. I cut back the plug wire a bit to fresh copper and got a real weak and intermittent spark. It seemed like there was some issue at the the other end of the wire. Any tips on replacing the wire?

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