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  1. #1

    1995 Polaris sl 750 backfiring up through carburetors

    hi i just got a 95 sl polaris 650 i cant fix the the hesitation and backfiring.

    this is what i did i cut the plug wires back 1/4 of a inch, clean carbs, check check valve in vent line of gas tank

    i got about 120 comprission on 3 heads.

    it will start push of the button and idle all day, but when you try to rev it up its popping and backfiring.

    what could it be?

    please help anyone.
    Last edited by K447; 07-03-2013 at 09:28 PM.


  2. #2
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Could be a bad reed, did you look at them when you had the carbs off? Does it do it on all cylinders or just one?

  3. #3
    Hi Yes I check the reeds their good . It seems like all cylinder.

  4. #4
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Sounds like a timing issue.Did you have the flywheel or stator off? Possibly a lean condition.but with all cylinders I'm leaning to a timing issue.

  5. #5
    You mean the key for mag

  6. #6
    No I never had the stator or mag off onless buddy I got it off had it apart. Oh by the way is there water espoused to come out of the cooling rail down trow the back hose that runs back the where the exhausted goes out. Theirs no water coming out of it.

  7. #7
    BlueFishCrisis's Avatar
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    Are you performing this testing in the water or on the trailer?

  8. #8
    I had it on the pond but last few time on the trailer with gardan hose

  9. #9
    BlueFishCrisis's Avatar
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    Make sure you do not turn the garden hose on BEFORE you start the motor. You can flood the motor and cause damage / internal corrosion issues. If you did run the hose before the motor, you may have ingested water which may cause hard starting, running, coughing, etc....

    Possible causes for timing issues:

    The flywheel were removed at some point and the shear key were not reinstalled, or was broken
    The crank is out of index, that is, the rods are not 120 degrees apart from each other on the crank, this may cause a timing issue.
    The stator were replaced and not installed with the timing mark properly aligned with the case halves

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Correct spark plugs installed?

    Correct plug wire ohms?

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