Backfire in mag piston
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  1. #1
    Resident Guru DamageInc's Avatar
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    Backfire in mag piston

    Just did a carb rebuild on my buddy's 97 Polaris slt 700. He said he was having trouble at 1/4-3/4 throttle. Put all new lines in, just before the carb work. Found some black particles behind the screen just underneath the needle and seat. Cleaned everything out good, rebuilt the carb pump as well.
    Fired right up, as it typically did before, but seemed better after 1/4 throttle. Then started having trouble staying running. Eventually died. Gave it a choke, fired up again. But I noticed flame, or ignition of some sort down the throat of the mag carb, beneath the butterfly.

    Any thoughts on cause and cure would be helpful.
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    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Backfire in mag piston

    It shouldnt spit back into the intake. Check the reeds.
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  3. #3
    Resident Guru DamageInc's Avatar
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    Re: Backfire in mag piston

    Yeah, just read a few threads on it. Shoulda Google it first.
    I'll pull them tomorrow.
    Thanks
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  4. #4
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    Re: Backfire in mag piston

    Opened it up, melted piston, problem due to a lean cond.
    Top end build.

    Thanks for the help.
    need to find domes for this. Any ideas where? I've been looking on line for two days.
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  5. #5
    Resident Guru 785 lugs's Avatar
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    Re: Backfire in mag piston

    I have domes what part # do you have
    are your last 3 #s 025
    Last edited by 785 lugs; 01-31-2018 at 08:16 AM.

  6. #6
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    Re: Backfire in mag piston

    I'll check after work.
    Where am I looking for those #'s...?on the inside of the domes?
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  7. #7
    Resident Guru 785 lugs's Avatar
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    Re: Backfire in mag piston

    on the top of the domes

  8. #8
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    Re: Backfire in mag piston

    3022025
    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  9. #9
    Resident Guru DamageInc's Avatar
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    Re: Backfire in mag piston

    96 xp stocker w/ the works
    96 xp stocker
    96 xp project
    92 X2 650/750 conv build

    90 JS440/650sx conversion
    04 YfZ450
    05 GSXR 1000

  10. #10
    Resident Guru 785 lugs's Avatar
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    Re: Backfire in mag piston

    ok i'll look today I should have them

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