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Thread: Polaris sl 650

  1. #1

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    Polaris sl 650

    I have a Polaris sl 650. Rebuilt carbs, changed fuel lines, new reeds, new plugs, drained and cleaned fuel tank, cleaned fuel line ends. Put it in the water last Saturday. Started out sluggish and then kinda cleared up. Never was snappy and lost power when trying to turn. Was riding along and it just died, finally got it running but now it dies immediately when at full throttle. Don't no what to do. Could it need fuel pump upgrade? Running out of ideas. Any suggestions?


  2. #2
    john zigler's Avatar
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    If you have not done a fuel pump upgrade you need to......

    when you rebuilt the carbs, did you use genuine mikuni brand parts / kits?

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    Quote Originally Posted by john zigler View Post
    If you have not done a fuel pump upgrade you need to......

    when you rebuilt the carbs, did you use genuine mikuni brand parts / kits?
    Yes mikuni parts. If fuel pump needs replaced, would it just shut off?

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    BlueFishCrisis's Avatar
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    No, fuel pump is driven by the crank case pulse line. The diaphragm in the pump pushes the fuel. When it becomes old and deteriorated, it pumps less, and causes lean conditions / fuel starvation.

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    john zigler's Avatar
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    Quote Originally Posted by checkmate305 View Post
    Quote Originally Posted by john zigler View Post
    If you have not done a fuel pump upgrade you need to......

    when you rebuilt the carbs, did you use genuine mikuni brand parts / kits?
    Yes mikuni parts. If fuel pump needs replaced, would it just shut off?
    Yes, it CAN kill from a lean condition caused by a bad fuel pump. Worst case, it could be seizing a piston from a lean condition.

    Many other things can cause a ski to "shut off". You may have an electrical / ignition issue.

    Regardless, you should do a fuel pump upgrade.

  6. #6
    BlueFishCrisis's Avatar
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    Quote Originally Posted by BlueFishCrisis View Post
    No, fuel pump is driven by the crank case pulse line. The diaphragm in the pump pushes the fuel. When it becomes old and deteriorated, it pumps less, and causes lean conditions / fuel starvation.
    To clarify, I took "it" as referring to the fuel pump, not the entire ski. When an electric fuel pump goes bad, it stops working. When these pumps go bad, they slowly lose flow potentially leaning out the engine and causing all the damage John mentioned.

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