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  1. #1

    Spark but backfires while trying to start

    Polaris Virage TX 1200 carbs
    having trouble getting the flywheel inspection cover out, to check the timing. Good compression and spark. Could the keeper pin of allowed the flywheel to turn preventing it from starting?
    Help


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    You can check the timing without removing the flywheel cover.

    Takes a bit of setting up to measure, but you can use the Hall Effect Sensor check to confirm the ignition triggers are happening at the correct crank positions.

    Polaris Domestic (red) engine

    How do I test old and new domestic red engine CDI, Magneto and Ignition coils?

    Is there any possibility the ignition wires have gotten swapped around?

  3. #3
    mine backfired because my reeds valves were toast

  4. #4
    bowsniper's Avatar
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    Thats what I was thinking.

  5. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    spitback thru carbs is the

    easy way to determine a reed problem...I'm sure you know what it takes do to a visual inspection.

    Sheared flywheel key is possible..but nearly as painful to correct.

    Any dings to the flywheel nut is a sign somebody has been in there before, and that increases the odds that lawnmower shear key was used.

  6. #6
    Watcon's Avatar
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    Backfire.

    If it backfires just when you release the start button, then hook up the family car (not running) as an alternative battery source. (ask K-447 for details).. If you suspect the the flywheel key has sheared, then remove the inspection cap, place the Magneto cylinder at TDC, and you should see the "0" degrees timing mark pointing strainght up. Hopefully K-447 will elaborate, as my typing finger is tired already.

    Regards,
    Randy

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Arrow How to check flywheel timing without removing the flywheel cover

    Quote Originally Posted by Watcon View Post
    ...If you suspect the the flywheel key has sheared, then remove the inspection cap, place the Magneto cylinder at TDC, and you should see the "0" degrees timing mark pointing straight up...
    I think you covered it nicely

    Remove the inspection cap from the top of the flywheel cover.

    Remove all three spark plugs, and remove the cover from the PTO drive shaft coupler at the rear of the engine.

    Now you can use your hand to slowly rotate the engine by twisting the PTO coupler. There are flats on the coupler for a wrench.

    Put a clean and straight wooden stick straight down the MAG cylinder spark plug hole. Slowly turn the engine using the coupler until the MAG piston pushes stick up as high as possible.

    If you have a dial indicator to monitor piston height, that would provide more precision.

    Work the crank shaft back and forth to determine the absolute highest point.

    Now look down into the inspection hole on the flywheel housing. As Randy said, you should be able to see the 0 degree mark on the flywheel rim.
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  8. #8
    Sorry what I meant was the inspection CAP NOT THE COVER. dOES THE CAP SCREW OUT ?
    THANKS DON

  9. #9
    casey67's Avatar
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    On my 96 700's ,Yes it does unscrew.

  10. #10

    Good spark will not start 2000 virage tx carb

    Have good compression, TDC at 0 degrees when mag piston at top. When I spay gas into the carbs like the old days with a car to get it running if one ran out of gas, it backfires and will not start. Did all the ohm checks, tested undoing the blk/yellow lead and the gray lead after to no avail.everything checks that can be checked any Ideas?

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