Poolís js550 750 conversion
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  1. #1
    PWCToday Newbie
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    Jun 2020
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    Columbus, OH
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    Poolís js550 750 conversion

    Hello all.
    i have just embarked on a js550 to 750 conversion. I have purchased a 750ss as my donor ski. So far I have the parts listed below.

    -750 engine from the ss
    -750 pump from the ss
    -Rhaas pump conversion kit
    -Rhaas motor mount adaptor plates
    -west coast 650sx exhaust
    -750 ebox from the ss
    -block off plates for the engine

    my question concerns the driveline. It is my understanding the 550 shaft and bearing will need to be replaced. I know rhaas sells a conversion bearing and an x2 shaft which I believe will make this all work. Is it possible for me to take the bearing from the 750ss and is that with a new x2 shaft ? Also is there any thing I should steal from the 750ss hull be fore I scrap it? Or if anyone needs anything from the hull it has all the remaining parts and is titled.

    thanks!
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  2. #2
    PWCToday Regular smokeysevin's Avatar
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    Mar 2013
    Location
    Houston
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    30
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    Re: Poolís js550 750 conversion

    Nice, I went down that rabbit hole and have yet to finish.

    I think the JS hull requires the Rhaas conversion bearing but I could be wrong. If you had started with a sx550 hull you can just use a regular one.

    As for the donor hull, I like to steal the brass cable thru hull fittings and the rideplate/intake grate threaded bosses.

    Sean

    The older I get, the more I find myself fixing things that I knew I was doing correctly at the time.



    1987 Kawasaki JankyStandup Build
    2004 Kawi-Doo STX-RXT-X Build
    2001 Toyota Tundra Basketcase Build


  3. #3
    PWCToday Newbie
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    Re: Poolís js550 750 conversion

    I’m gonna need a 650 exhaust manifold right? Just noticed this...10A51DC0-CBDE-4C97-A8A9-4758E18AB904.jpeg

  4. #4
    PWCToday Regular smokeysevin's Avatar
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    Houston
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    Re: Poolís js550 750 conversion

    Correct. It needs the 3 bolt 650 style head pipe

    Sean

    The older I get, the more I find myself fixing things that I knew I was doing correctly at the time.



    1987 Kawasaki JankyStandup Build
    2004 Kawi-Doo STX-RXT-X Build
    2001 Toyota Tundra Basketcase Build


  5. #5
    PWCToday Newbie
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    Jun 2020
    Location
    Columbus, OH
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    Re: Poolís js550 750 conversion

    Some progress pictures of cleaning up the hull. I decided to strip it down and coat it with appliance epoxy and then get a full cover graphic. 0D8A18E3-A028-494B-9274-E1C95A309483.jpeg584713C9-92C1-4DFD-B62B-A27396FA753F.jpeg968C75E6-05F9-4398-BA19-759414FBAF3D.jpeg44ABF4B8-AE6E-4780-AC00-34CFA22B3541.jpeg

  6. #6
    PWCToday Newbie
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    Columbus, OH
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    Re: Poolís js550 750 conversion

    Had a small repair I had to make on the rear corner. Also the nose was repaired at some point and needed some better bondo work. 8F64B999-14D2-468A-9AA5-292EB53C7A67.jpeg9D85578E-6432-43BF-A560-12C50D942372.jpeg

  7. #7
    PWCToday Newbie
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    Jun 2020
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    Columbus, OH
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    Re: Poolís js550 750 conversion

    Been working non stop to get this hull ready to take inside before it gets too cold. The hull is white appliance epoxy and the hull braces and handle pole bracket will be black.
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  8. #8
    PWCToday Newbie
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    Jun 2020
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    Re: Poolís js550 750 conversion

    Couldn’t help myself I applied the graphics I ordered to the hood to see how it looks9CC9F43F-546F-4A4A-8F34-F20DD68C13D8.jpeg

  9. #9
    PWCToday Newbie
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    Jun 2020
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    Columbus, OH
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    Re: Poolís js550 750 conversion

    Progress is moving along nicely. Got the handle pole finished and wiring complete. Using the 750ss ebox with the 550 start stop. I also wired in an older js400? Start switch for the bilge pump. I used the last unused port oN the ebox to wire up the bilge and switch. Now I need to figure out what to do about the throttle cable mount. Also I have a weird situation going on on where I need to connect my exhaust to the seadoo water box... any ideas? Also anyone know the correct orientation for the west coast pipe? Is the cooling nipple supposed to be on top ? CA7A824B-32A8-496F-8CD3-1D810160D3F7.jpeg17C77819-BD6F-4A9A-AD28-DC6CE996FF1E.jpeg9B598904-75EF-482E-9E86-371D454AA96C.jpeg19A9B2A2-2B2D-4852-BD4D-2416393A1EF4.jpeg

  10. #10
    PWCToday Newbie
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    Re: Poolís js550 750 conversion

    On the throttle one is for the throttle cable and one is for choke cable. Can you use the choke for your throttle cable (closer towards motor) and chop the other one off? Nice work btw and quick work. Got to get my 650 swap going
    Last edited by SkiMan104; 10-16-2020 at 03:50 PM.

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