Seadoo motor swap question
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  1. #1
    Resident Guru DamageInc's Avatar
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    Seadoo motor swap question

    I have a 95 spx hull, which I believe came with the 657.

    Can I drop a 717 from a 95 xp in it? Buddy's got a donor ski up north, and if poss, if like to swap it in.
    Any info on pros, cons, drive shaft lengthening or shortening, etc., would be greatly appreciated.

    I also have a 96 xp 787 w/ spec 2, Novi's, etc, that I'd like to have my grey box tested as well, so if there's someone on here that provides this service, that'd be awesome.

    Thanks for any advice.

  2. #2
    PWCToday.com Is My Home Away From Home Cliff's Avatar
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    Re: Seadoo motor swap question

    I don’t know the answer(s) to the engine swap. But I believe Minnetonka4me or 99SPXXX might perform the MPEM service. You can message them with any details.

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Seadoo motor swap question

    Yes, the 717 will swap right in, no issues. Same exhaust arrangement, same motor mount locations, same driveshaft length.
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  4. #4
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    Re: Seadoo motor swap question

    Nice.
    Thanks so much.

  5. #5
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    Re: Seadoo motor swap question

    There is some difference on the engine bedplate but if you have the plate for the 717 it drops right in, you will also need to swap out the plastic fitting for the water outlet at the back of the hull as the 657 uses a different size hose.
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  6. #6
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    Re: Seadoo motor swap question

    Noted.
    Thanks Speedracer

  7. #7
    Resident Guru hafweigthr's Avatar
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    Re: Seadoo motor swap question

    A 95SPX should be a 657X motor like the 94 XP and you should be able to use the same MPEM as well for the 717. However, I can't remember exactly but the 657 or 657X has a different stator configuration than the 717 which may prevent that . I have done several 587 and 657/x conversions to 717s. With a 587 to 717 conversion you can't use the MPEM since the rev limiter is a different rpm.
    Will look at electrical diagrams and confirm whether the 657 or 657X is the same electrically as the 717.

    And yes either way (per WFO) you will have to reconfigure hoses and inlet outlet configuration to the pump.
    Last edited by hafweigthr; 12-15-2021 at 09:03 PM.
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  8. #8
    Resident Guru hafweigthr's Avatar
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    Re: Seadoo motor swap question

    Quote Originally Posted by hafweigthr View Post
    A 95SPX should be a 657X motor like the 94 XP and you should be able to use the same MPEM as well for the 717. However, I can't remember exactly but the 657 or 657X has a different stator configuration than the 717 which may prevent that . I have done several 587 and 657/x conversions to 717s. With a 587 to 717 conversion you can't use the MPEM since the rev limiter is a different rpm.
    Will look at electrical diagrams and confirm whether the 657 or 657X is the same electrically as the 717.

    And yes either way (per WFO) you will have to reconfigure hoses and inlet outlet configuration to the pump.
    After reviewing the electrical diagrams the 657X motor is the oddball and has the 5 wire stator as opposed to the 4 wire stator that is used in the 587,657, and 717 motors. The 95SPX should have the 657X motor so those electronics(as far as the magneto hookup) will only work with the 4 wire stator(I believe) so you will need to use the 717 MPEM with the motor. You will need to review the electrical diagrams between the 95SPX and the 717 donor ski to verify what is different electrically vs gauges, etc.
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  9. #9
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    Re: Seadoo motor swap question

    Thanks for the info haf.
    I'll use the electronics from the 95 xp 717. They seem to be in good condition, but need to wire in the ecwi unit for the Spec 2. If like to send the box to have everything tested so I don't run into an issue later, but haven't found anyone that can do that....

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