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  1. #1

    Join Date
    Oct 2012
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    Lake of the Ozarks
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    02 seadoo xp 951 backfiring

    ive got a carb 951 xp that is backfiring. ive got spark on both cylinders but the rear cylinder is not hitting. carbs are cleaned and have new kits in them, and the pop pressure is where it should be. rave valves are good. i was wondering if the computer would cause an eratic spark, and if they had to be configured. i put a different computer in it and the xp will turn over but no spark. . . any ideas?


  2. #2
    JayZ's Avatar
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    Feb 2006
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    mississauga, ontario
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    Are your reeds in good condition? Not broken or chipped?

  3. #3

    Join Date
    Oct 2012
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    Lake of the Ozarks
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    the reeds are in go shape no chips and they open fine

  4. #4
    At first you say you "have spark" then at the end you say "no spark". Does this mean you had spark with the original computer?
    Can you start the ski with only one plug connected?
    Is your timing off?

  5. #5

    Join Date
    Oct 2012
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    Lake of the Ozarks
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    i have spark with the original computer that was in the bike. i switched to a different computer and the bike will turn over but i have no spark on the new computer. i don't think i have a timing issue. the key way and key are both good the flywheel hasn't been changed that i know of. im just wondering if the orginal ecm is making the pto cylinder spark weird.

  6. #6
    put an inline spark checker on and watch the spark when it backfires, if it has to do with the spark you'll see it drop at the same time as the backfire.

  7. #7

    Join Date
    Mar 2006
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    what is the part number on the 2 mpems you are playing with?

  8. #8

    Join Date
    Oct 2012
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    278 001 526

  9. #9
    Myself's Avatar
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    May 2007
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    North Central Arkansas
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    Both MPEMs have the same part number?

  10. #10

    Join Date
    Oct 2012
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    Lake of the Ozarks
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    Yea both mpems have the same numbers

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