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  1. #1

    sl9oo - polaris engine - backfire problem

    SL900 96 polaris engine - getting fuel, spark, compression good - but wont start - turns over then a shotgun blast! It almost sounds like a ficht computer gone bad. Can a Bad Control module still produce spark and give me a no start situation and big backfire? I've replaced them before but lost spark altogether. Anyone experienced this before on these engines?? I know a twisted crank might but thats probably rare. Thanks!! Jim By the way in turns over for about 8-10 sec before backfiring
    Last edited by jimfleming88; 09-07-2014 at 06:44 PM.


  2. #2
    David Drkvampire2001's Avatar
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    Your Woodruff key could be sheared off, which would have allowed the timing to move.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Drkvampire2001 View Post
    Your Woodruff key could be sheared off, which would have allowed the timing to move.
    +1

    Check flywheel index with front piston at TDC. My guess is the flywheel has rotated on the shaft.

  4. #4
    BlueFishCrisis's Avatar
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