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  1. #1

    Polaris slows down

    I have a 98 Polaris SLTH. Runs fine when first out 47 mph. Then after about 10-15 minutes in will only run about 15, then couple minutes later only about 5-6 and smokes. I have tried new plugs, seafoam, and gone to amsoil interceptor. Any suggestions?


  2. #2
    Home grown engineer, and professional tinkerer. 2 Strokin' Polaris's Avatar
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    Welcome to the Hulk! Are you pre-mixing or using the oil injection? What do the plugs look like? What kind of plugs are you running? Have the carbs been rebuilt or cleaned?

  3. #3
    Quote Originally Posted by 2 Strokin' Polaris View Post
    Welcome to the Hulk! Are you pre-mixing or using the oil injection? What do the plugs look like? What kind of plugs are you running? Have the carbs been rebuilt or cleaned?
    I have oil injection using amsoli interceptor. Running ngk plugs, go black if run long with motor in weak smoking mode. I have tried seafoam and even poured some down carbs, cut off, let set for 5 minutes, and then refired. I have taken out twice since and runs fine 10-15 minutes and then slows down.

  4. #4
    Home grown engineer, and professional tinkerer. 2 Strokin' Polaris's Avatar
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    Are you running the BPR8ES plugs? If not you may be in a heat range that won't allow the plugs to "clean" themselves explaining the gradual progression to poor performance.

  5. #5
    casey67's Avatar
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    Is it running hot ? Does the MFD red light flash ?

    Try loosening the gas cap when it slows down,it's possible the fuel tank is building too much pressure and forcing gas into the crabs

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