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  1. #1
    Nickeljet's Avatar
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    Kawasaki 15f low rpm and heat warning

    I have a Kawasaki 15f Stock ski 40 hrs. The rpm is low (less than 6000) and after a few minutes the heat signal comes on and goes into limp mode. I checked all the water hoses and pump outlet but no blockages. Cleaned the fuel tank and filter. 80 #s pressure on the fuel pump. It runs cool and fine on the trailer. Just does it in the water. Any thoughts on this?


  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    80 pounds of fuel is way too high how did you check it? It should be around 42. It sounds to me that you have something stuck or damaged in the jetpump pull it and check for debris in the top where the water lines go and check the pump bearings.

    Sean

  3. #3
    Is the bypass port flowing water when riding the thing?

    rt

  4. #4
    Nickeljet's Avatar
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    Pisser is flowing . Is this the bypass you are speaking of?

  5. #5
    Nickeljet's Avatar
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    Gauge may have been off some but it was tested right off the pump outlet

  6. #6
    Good and yes pisser is by-pass flow. Maybe exhaust is overheating and has a blocked/corroded fitting somewhere?
    I've seen pissers flow on hose but not in the water when a head gasket partially or begins to fail and the higher combustion pressure pressurizes the water jacket. Usually steam comes out the pisser when in the water.

  7. #7
    Nickeljet's Avatar
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    No steam from pisser. What are the two hoses that go directly in front of the drive coupler? Could this cover be plugged up?

  8. #8
    Quote Originally Posted by Nickeljet View Post
    What are the two hoses that go directly in front of the drive coupler? Could this cover be plugged up?
    They are two inlet cooling hoses from the pump.

    Quote Originally Posted by Nickeljet View Post
    I checked all the water hoses and pump outlet but no blockages.
    But you already checked them didn't you?

  9. #9
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    there are 3 heat sensors I believe, intake air (not likely), oil temp in the oil pan (not likely), and water temp at the header (my guess). Pull the hoses and blow compressed air through them, when you have the hoses off check for corrosion or salt buildup.

    Sean

  10. #10
    Nickeljet's Avatar
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    This ski was used in salt water by kids and never flushed. I solved the problem by connecting the return line from the generator cooler to the flush kit with a Tee and plugged the muffler fitting. The ski runs cool and very responsive now. Thanks for all your input

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