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  1. #1
    novanuttz's Avatar
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    93 SL750 shutting down.....Help

    Took the skis to the lake today and my 93 is acting up. Off the trailer and idling out, shut off twice before I get to buoys. Starts right back up and runs for another 30- 60 seconds every time. Checked fuel delivery (triple pump) all good. When it shuts down, its just like hitting the kill button. Need input.


  2. #2
    Race, wreck, repeat delagem's Avatar
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    My 92 used to do this all the time, stop like the kill switch, start right back up; turns out it was light siezures. The 92 had a serious flaw with the intake manifolds, it was 3 separate manifolds that had to be installed loosely, aligned, and then the carbs installed. I never caught it because I did my leakdown test using a rubber gasket under the carbs, which sealed well enough, but when I switched to the paper gaskets under the carbs allowed an air leak.

    I don't recall if this affected the 93 model, but it's in the OEM factory manual; is your manifold a single piece, or 3 separate pieces?

  3. #3
    Race, wreck, repeat delagem's Avatar
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    Oh dear, it looks like mine. That silly plate, #16, is used to align the intakes, #26, prior to mounting the carbs. Got this off Babbitts website:
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  4. #4
    FLjoyrider's Avatar
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    take apart the carbs, check diaphrams, fuel screens, etc. make sure your pulse lines are in good condition.. might as well look at your reed valves too. make sure you don't have the grey fuel lines and clean out the fuel selector valve.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Next time it shutts off, check the engine temp.

  6. #6
    novanuttz's Avatar
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    There may be something to the eng temp. I did nothing to the ski after the trip. I connected to the garden hose and ran it. Died twice within two min, but after the third start in never died. Ran for 15 min with no problems. wonder if I dislodged something in the cooling system. Does the temp sensor kill the motor if it overheats?
    Does it have a thermostat?

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Won't kill the engine because of an overheat. It will only warn you on a 650/750 and put a 780 into limp mode.

    If it pistons get too hot and expand faster than the cyls, you can have a cold seizure.

    If you overheat, they will expand too much and possibly seize.

    They did come with a thermostat. Whether there is still one installed, ???????

    You can check it. It's located in the end of the cooling bar. Right where the 3/4" hose connects to.

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by novanuttz View Post
    ...I connected to the garden hose and ran it. Died twice within two min, but after the third start in never died.

    Ran for 15 min with no problems...

    Does the temp sensor kill the motor if it overheats?
    Does it have a thermostat?
    Did you run it for 15 minutes continuously on the garden hose?
    That is a no-no.

    The through-hull and jet pump bearings depend on the normal water flow through the jet pump for cooling. On the garden hose, these bearings do not get cooled the same. The normal time limit on the garden hose is two minutes maximum, to avoid overheating any of the bearings and seals.

    If the seals have overheated, they partially melt where they contact the rotating drive shaft, and will no longer properly keep water out of the bearings. Water in the bearings then causes rust, which greatly shortens bearing life.

    More info on jet pump issues, and bearing/seal replacement can be found here;
    Keeping your Polaris PWC on the water

    Engine over heat will issue warnings, but will not shut the engine down.

    There should be a thermostat inside the thermostat housing, if the engine still is still stock.

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