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  1. #11
    steve45's Avatar
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    I've had intermittent overheating on one of my Ultra LXs. Last night I was messing with it and discovered that one of the cooling hoses on the pump was partially kinked. Don't know if this was the cause, but I'm replacing it with good hose.

  2. #12
    Pain is fear leaving your body.... rlovebk's Avatar
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    Where the cooling hoses are hooked up on top of the pump can at times be an issue. The water enters the system for cooling here pushed by the pump. This can be checked if you have not inspected the pump and bearings yet, which I highly recommend.
    Also there is a point where it enters the rear of the engine at the coupling area. There is a small cover here with a nipple for the hose to connect. This often corrodes and plugs. You can check there.

    Based on the fact this has not been an issues previously you may have just had something stuck over the pump pick up area. Unusual but even a small piece of plastic can do this. Putting it on the hose would have taken care of this if that were the issue.
    The 15F is a great, reliable ski. Have fun with it.

  3. #13
    Pain is fear leaving your body.... rlovebk's Avatar
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    P.S. Get a service manual. It is an invaluable tool.

  4. #14

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    Thanks! Have one.

    Availble at

    https://www.manualslib.com/

    Seach STX-15F and add the year you are looking for

  5. #15

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    Getting ready to reassemble since everything has been flow tested. I am going to hook up a tee from the 2 pump inlet lines and test.

    Has anyone got any info on hole size for the spray hole in the water box or any flow info? I may pull it out but doesn't seem likely as not much coming out the pisser.

    I will test the temp sensor if everything flows well.

  6. #16

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    Replaced the impeller with a new Kawasaki unit. 2 rides, no more overheating at idle so far. Still has one problem. No start occasionally won't start when warm. Wait 30 seconds and it will start. Checked temp sensor which appears to be original and ohms correctly at room temp.

    Ski is a 2007 STF-15F. As I recall from reading Kawasaki made some updated sensors possibly due hot no start issue.

    Anyone know if 2007 had updated temp or other sensors?


  7. #17
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    2013 was the first year of the new ones, they are not plug and play, they require bias resistors and the ecu to be flashed

    Sean

  8. #18

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    As I recall Sean, you actually tried reflashing one and adding resistors with new sensors?

    Did it work?

    Is it worth it?

  9. #19
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by Tom Doniphon View Post
    As I recall Sean, you actually tried reflashing one and adding resistors with new sensors?

    Did it work?

    Is it worth it?
    It did work, some ecus are more sensitive to the new sensors and require different resistor values to be added. I would have to check my notes for more info though.

    As far as being worth it, I can't comment because I never ran into that issue. The sensors aren't cheap, I think they are $50-70 each

    Sean

  10. #20

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    So Sean would you suggest trying a new 2007 type temp sensor first?

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