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  1. #1

    650sx engine in a js300?? Will it fit!?

    I have a 1987 JS300 and want to swap in a motor from a 1988 650sx. Will this motor bolt directly in? Also, will I need other parts from this ski, such as the electronics and everything??

  2. #2
    Yes it will I had a friend that did it. Exhaust was very tight. Not much room to work with. Not an easy task. Lots of machinal stills needed.

  3. #3
    thesepaperwings's Avatar
    Join Date
    May 2007
    South East Kansas
    You will need everything from the 650 and a conversion plate for the motor mounts.

  4. #4
    waterdoglouie's Avatar
    Join Date
    Dec 2008
    Southwest Idaho
    The JS 300 is the same hull as the 440/550 and lots of people have done a 650 conversion into them.

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