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  1. #1

    1996 SP mpem question

    My 1996 SP had a 587 that froze up, so I bought a 720 motor & elc. box
    A 1995 XP ECU box that has MPEM 278000423. Motor is 717cc

    I can understand that engine was a 720 motor, same as 657
    only more. Is the MPEM in my '96 ski for both 587 and 720?

    The MPEM now in it is 278000821. Any info out there on
    this modle/year? My 95 GTX is broke down with bad MPEM (423).


  2. #2
    GTXX's Avatar
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    looks like a 587 only.

    you can go to sea-doo.com and use the parts look up, there is an Advanced search that will tell you everything a part number was used on.

  3. #3
    cameron da river rat's Avatar
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    heres what ive done with sea doo's.

    if you use a different engine than what came with the ski, you can use whatever electronics you want just make sure you match them. what i mean is, if you use your 587 electronics such as your mpem, make sure you use your stator AND flywheel that came with it as well. that mpem is programmed for whatever spark advance your flywheel and stator are so if you go mis matching parts, it wont be correct.

    and by the way, the 657x electronics are the best, they had the most aggressive spark curves from the factory. i use to have a 720 with a 95xp 750 exhaust system (the FAT one), micro touch water injection and 657x electroncs and 96xp larger carbs jetting down but jetter larger than stock 720 and that ski would hold its own against many others. the 657x and regular 657 are not the same. i think the 93xp 657 and 94xp 657x and 95 spx/gtx 657x had those ignition systems that had more spark and better spark curves, i wanna say they had dual coils as well, hence the better spark

  4. #4
    HmmMMMMMMMMMM. Crank taper is not the same. Mmm. Can't go There!!

  5. #5
    cameron da river rat's Avatar
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    crank taper not the same? on what? all sea doo 587, 657, 657x and 720 flywheels will swap on any crank

  6. #6
    Tool Bag water worx's Avatar
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    Quote Originally Posted by Bills86e View Post
    HmmMMMMMMMMMM. Crank taper is not the same. Mmm. Can't go There!!
    I see "Mr Know it all" found his way over here.

    And yes Mr Bill you are wrong about crank taper not being the same....

    Open mouth insert foot. LOL

  7. #7
    Kidd800XP's Avatar
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    hahaha hahaha

  8. #8
    cameron da river rat's Avatar
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    i just cant get no love anywhere............

    dan knows more than he admits

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