1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..
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  1. #1
    PWCToday Newbie
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    1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Doing a full build on my seadoo 587 and I will be swapping parts from a skidoo 587. The skidoos had 100hp so I am shooting for 85hp as there is a slight difference in the cylinder which I will show you later, and your seadoo 587 yellow or white motor could really benefit from this..

    the build will include a pipe, custom exhaust manifold to mount the pipe, dual carbs, high compression head, a prop and a pair of skidoo cylinders. (ports on the skidoo cylinders are MUCH larger and appear to be far more effecient than the seadoo counterpart)

    To get the pistons to work with a seadoo I had to trim down the cases as the pistons would hit the bottom


    20190518_173214.jpg

    20190518_173312.jpg


    Here is a comparison of the seadoo vs skidoo cylinders

    SKIDOO
    20190518_173151.jpg

    SEADOO
    20190518_173155.jpg


    Now the interesting part, and what would really gain some good hp for your seadoo is this extra port:

    20190518_173301.jpg
    20190518_173306.jpg

    The thing is the stock seadoo cases dont have this spot for an extra port. Also the stock seadoo cylinders have this same port but it is shaped a little differently. I could bet by cutting the cases this would add a good 5-8hp (i think)

    Here is a pic of the seadoo cases
    20190518_173312.jpg

    Here is the pipe
    20190518_173226.jpg

    I will update this project as I finish the build. I want to bring this down to the beach which will be in 2 weeks so the plan is to finish by then.

    Prop will be a solas 15/20 super camber (J series i believe)

  2. #2
    PWCToday Newbie
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    Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    I also forgot to mention I will be adding a 159 degree rotary valve

  3. #3
    PWCToday Newbie
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    Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Cylinders are installed. I ended up shaving the piston skirts down as I got tired of messing with the cases. the connecting rod does fit the skidoo pistons fine and the cylinders line up with the case

    20190519_194245.jpg

    Next step will be installing the cylinder head and getting the rest of the engine put back together.

    Also, Apparently they actually make performance cdi boxes that fit the ski doo and seadoo 587 89-91 yellow motors. They are supposed to have upgraded ignition timing and higher rev limit. I did not know this engine had CDI controlled ignition and i kinda doubt that. Maybe someone can clarify and I also thought the rev limit on the yellow 587 was controlled by a separate device, not the CDI...then I guess whats the point of the CDI if it doesnt control ignition or at least the rev limiter. I cant find the ebay listing I purchased the cdi from but Ill look through my purchase history and post it later

  4. #4
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: 1989 seadoo 587 full build!! Pipe, Cylinders, prop, etc..

    Cool stuff. I have some rare race stuff from that era that has Skidoo stuff in it.

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