Will a Sea doo 657 block (not the 657X) work in a 1995GTX?
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  1. #1
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    Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Hello. I appreciate any help. I bought a SPX for a parts ski. It had a fresh rebuild on the motor it came with. Everything to the ski was torn apart and in boxes. I have a nice 95 GTX that the motor looks poor and was going to swap out the blocks and put the rebuilt motor (657 or 657X (not sure)) in the GTX. I was looking at things with the old motor in the GTX AND IT LOOKS LIKE IT MAY WORK? Has anyone ever used a 657 in place of an X? Anything I need to do or look for? This probably sounds stupid to the pro’s but I’m newer to this and have mainly worked on Yamaha’s. Thanks in advance for any help.

  2. #2
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    It will all fit with no problem.

  3. #3
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Thanks!!!Awesome! Great news!! What is difference between regular 657 and X? Also, will electrics swap easy?

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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Also found 2 of these in the box of parts...any ideas?BC395F69-CEDC-479B-B2A6-55A5172270CD.jpeg

  5. #5
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Electrics will interchange maybe same slight diff but should run as both are single coil stators.

    That part looks like a ninja throw disc ????

    LOL

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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Lol yes I know. Filled with tetnes!

  7. #7
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    LOL! That was a good one Grumpy.

  8. #8
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    The only difference will be the rotary valve cover, the ports are different on those two engines so you will need the rotary valve cover that goes with the motor you are going to use, the intake that bolts to the rotary valve cover will fit either cover.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries


  9. #9
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    Re: Will a Sea doo 657 block (not the 657X) work in a 1995GTX?

    Man you know your stuff! Thanks!!

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