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Kawasaki 1100 top end issues

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  • Kawasaki 1100 top end issues

    hey guys i got an issue. Customer dropped off a Kawasaki 1100 jet ski because it was running rough on top end. I’ve been tearing my hair out trying to figure this thing out. Compression is 105,105,90, CV carbs have been cleaned 3 times now, spark plug wires trimmed back, new fuel lines, new filter, new spark plugs. For some reason when you take it out it only goes to about 6500RPMS and seems to be hitting almost like a rev limiter, thought it was temp sensor so i bypassed it and retested and same thing, if you hold it 1/4 throttle it seems to get up to 7000 or so but once you go more than say half throttle it starts cutting out again. Everything I’ve ever learned tells me fueling issues but i can’t seem to figure out what could be the issue. Is there anyway to test for fuel pressure? Any secret passageways that get plugged up? I’m stumped and the customers getting upset that it’s taking so long. And i also do free diagnostics if the repair is done with me so i’m sick of eating up all this time on this machine. Any help appreciated!!
    boats i own:

    15' Glastron HP154 W/Mercury 90 HP

  • #2
    Check the oil pump. It may be dishing out too much oil and bogging it down. I believe it is attached to the throttle so bogging down with higher throttle and running better at low throttle makes sense. It is unusual to get to 7000 at 1/4 throttle, at least on my 1100. Go through and adjust the throttle cables and make sure the carbs are synced.

    What year machine is it?

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    • #3
      I believe it’s a 1997, at least that’s what he told me and now that you mention it the throttle cable is kinda loose going to the carb like there’s allot of slack, I’ll have to adjust that and see what it does. I had never thought that it could feed enough oil to cause that to happen but we will see
      boats i own:

      15' Glastron HP154 W/Mercury 90 HP

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      • #4
        check the plugs, they will be fouled if there is too much oil. But I would start with the cable adjustment. Beyond that, possible fuel delivery issue. Insects like to build nests in the vent tubes.

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        • #5
          Verify year by the HIN, last 2 digits are year of manufacture, I believe the plate is below the seat at the rear

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          • #6
            Originally posted by wahlejim View Post
            check the plugs, they will be fouled if there is too much oil. But I would start with the cable adjustment. Beyond that, possible fuel delivery issue. Insects like to build nests in the vent tubes.
            What vent tubes?
            boats i own:

            15' Glastron HP154 W/Mercury 90 HP

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            • #7
              Fuel Tank vents

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              • #8
                Could a reed valve be torn or broken? Maybe that could restrict enough to limit top-end? One time I had a clogged cat on a nissan truck and could not go over 60mph due to the exhaust back pressure. I've had 2 ZXi's and currently an ultra 150 and never seen what you describe but I have seen limited top speed/ rpm when not running on all 3 cylinders...could it be running on 2? Did you change the plugs?

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                • #9
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                  Pull the plugs and look at them. If it is only running on 2, it will be pretty obvious.

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