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  1. #1
    PWCToday Newbie barlosbhz's Avatar
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    650 sx triple 900 adaptation

    Hello. I am adapting a 900 zxi engine in my 650 sx, I am with some doubts regarding the propeller to be placed, at present I adapted in the original 140 mm turbine of the 650 the original propeller of the 900 zxi, will it be difficult to start The jet with this runnaboult propeller? The leak does not fit into the hull for a little bit, I decided to cut the hull and start the direct leak without the waterbox, have any problems mounting so directly without the waterbox? Can someone help me ?
    20161231_100453.jpg20170121_160040.jpg20170205_144023.jpg20170204_101624.jpg20170204_101433.jpg20161114_172650.jpg20170121_141855.jpg

  2. #2
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: 650 sx triple 900 adaptation

    If you don't run the water box, your machine will be EXTREEMLY loud. Also, the engine / pipe need the water box, for correct back pressure. You will actually loose performance if you do not have proper back pressure.

    You will need to re-route your exhaust to the front, to go to the water box.

    For impeller choices, I would start with a 14/19 Skat, Large hub Swirl, or a Solas Concord 11/16 either cut for a 650 Jet pump.
    RCJS also doing business as WATCON
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  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: 650 sx triple 900 adaptation

    Should add - The stock 650SX water box will be too restrictive for the 900 engine. You will need to modify it to breathe better, or get a different box.
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web sites

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    used parts www.rockcountyjetski.webs.com
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  4. #4
    I dream skis Bob Gruen's Avatar
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    Re: 650 sx triple 900 adaptation

    TDR makes a 2" version (do NOT buy the baffle-less/spraybar version), and the SeaDoo HX has two generations, the latter is 2" in and 2.25" out and has water injection. You have to figure out how to mount the SeaDoo box upside down.

  5. #5
    PWCToday.com Is My Home Away From Home hyosung's Avatar
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    Re: 650 sx triple 900 adaptation

    Quote Originally Posted by john zigler View Post
    Should add - The stock 650SX water box will be too restrictive for the 900 engine. You will need to modify it to breathe better, or get a different box.
    """BACK PRESURE LMFAO"" you're an idiot and that proves that you know fvck all , use google and you will find that 2 strokes dont need back pressure,,,, ! that said , the water box stops back flow as you slow down (and helps to curve the power band) , without a water box you risk swamping your motor when you are stopped with engine not running or creating a vacuum when slowing down, TDR ? i think make a waterbox for the sxr 1100 conversion so that would be an option ,other than that a custom mate WB or you can jerry rig the stock 900 box into the sx hull
    2 x 650 sx custom build (my toys) http://www.pwctoday.com/showthread.php?t=425767

    modded X2 650

    stock looking ZXI 900 ""being cannibalized to sponsor a 650 sx build """

    Jerry Rigging is my specialty .....


    Originally Posted by hyosung
    so when you say i """ hammer and slap things together """ this may be so , BUT they are hammered and slapped together SOLID

  6. #6
    PWCToday Newbie barlosbhz's Avatar
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    Re: 650 sx triple 900 adaptation

    Hyosung, I used to use the direct exhaust without waterbox before the conversion, I've been running for 3 years and never had a problem until today. But I understood what you said about getting in the engine, I'll be careful not to get water into the engine when it is not running. I can not wait to hear the triple symphony in the stainless steel exhaust. Thank you all !

  7. #7
    PWCToday Newbie barlosbhz's Avatar
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    Re: 650 sx triple 900 adaptation

    I replaced the 650 sx hull cooling tube with the original 900. I thought I'd put an extra water outlet on number 3 cylinder, what do you think?

  8. #8
    Top Dog Benflynn's Avatar
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    Re: 650 sx triple 900 adaptation

    Inline silencer might help

  9. #9
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: 650 sx triple 900 adaptation

    Please ignore Hyosung, he is the forum troll / idiot and he is showing his jealousy.

    He does not even understand how a 2-stoke exhaust works, thus his statement above.......

    Trust me, you NEED your waterbox....
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web sites

    new parts / products / services www.watcon.com
    used parts www.rockcountyjetski.webs.com
    thank you

    Please check out and like WATCON on Facebook

  10. #10
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: 650 sx triple 900 adaptation

    Hyosung (colin walker)
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web sites

    new parts / products / services www.watcon.com
    used parts www.rockcountyjetski.webs.com
    thank you

    Please check out and like WATCON on Facebook

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