SX 650 with big pin 750 fuel system
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  1. #1
    PWCToday Newbie
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    SX 650 with big pin 750 fuel system

    Hi All,
    First off, I'm a newbie so bear with me
    So I bought a 650 with a 750 engine in pieces and am putting it together. My question is regarding the plumbing for the fuel system. I have looked at both the 650 and 750 service manuals, but am still confused. My confusion comes with the pulse line. It seems like I have an extra line. The dual keihin carbs have a line running to the block. I assume this is correct? But what I believe is the 650's fuel pump also has a pulse line. Do I just bypass the pump and hook up the lines from the fuel tank and choke to the carbs? I'll post pictures. Thanks for the help! 20180225_001755.jpg20180225_001800.jpg20180225_001709.jpg20180225_001701.jpg
    Last edited by Xbnew; 02-25-2018 at 02:42 AM.

  2. #2
    I dream skis
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    Re: SX 650 with big pin 750 fuel system

    You don't need the 650 fuel pump anymore. The 650 engine (87-90 650SX) uses an external fuel pump; your carbs on your 750 have a built in fuel pump. Completely remove the 650 pump. The rear carburetor on your 750 is the carburetor with the fuel pump. This carb gets the fuel output line from the selector switch hooked to it,
    and also the vacuum line from the case. The forward carburetor is fed fuel from the rear carburetor. The fuel return line (back to the tank) is hooked to the forward carburetor.
    I haven't worked on a 750 Kawasaki in years, but this is how they are set up
    if I remember correctly, I'm sure someone will chime in if this is
    wrong.
    2001 Superjet; R&D, Blowsion, UMI, Riva, Wetwolf, Ocean Pro.

    1987 650sx: Mariner, UMI, Neo Designes, R&D, Jetsports, Renthal, Hydro-Turf, Skat-Trak, Reworked stock pipe, 40mm carb, Wetwolf F/S cone.

    1986 JS300; lots of mods, fast for a 300...I think

    1987 X2: Rips pretty good and has some 80's flare.

  3. #3
    PWCToday Newbie
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    Re: SX 650 with big pin 750 fuel system

    I see. Thanks for the help!

  4. #4
    PWCToday Regular
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    Re: SX 650 with big pin 750 fuel system

    I'd like to make a suggestion here. That 650 fuel selector switch is very restrictive. If you were running that 750, I would completely bypass the selector. In my opinion you should run the line directly from the reserve in the fuel tank straight to the inlet on the carburetors. I have seen several 750's, and even high, reving 650's lock up due to lack of fuel in a 650sx or x2 hull.

  5. #5
    PWCToday Newbie
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    Re: SX 650 with big pin 750 fuel system

    Didn't think about that! One less thing to worry about/ break.
    Thanks!

  6. #6
    PWCToday.com Is My Home Away From Home theVetteman3's Avatar
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    Re: SX 650 with big pin 750 fuel system

    Another rider from the city! I had a 650sx/750 and still regret selling that ski. I created a build thread, you can find it if you search by my name in the individual builds section.

    I kept the fuel selector but Keihin42 brings up a good point. I would ditch the stock fuel filters and go with a clunk arrangement. Those stock filters and plastic tubes can break easily.
    1985 JS550/800 "Pretty Red": Newmiller 800, Rhaas 750 pump conv. [56.3mph gps]
    2009 1100 SJ:
    Kawi 1100 build in progress
    2009 SJ MINT:
    KP steering adaptor, Worx 228 intake [45.8mph gps]
    1987 WJ650:
    6M6, JD Intake Grate, 17/20, cheater pipe [47.8mph gps]
    1994 XiR: 830cc Superstock, PJS side draft, 13/18 swirl [53.7mph gps]
    1998 SXI PRO:
    3DR hull mods [TBD]



  7. #7
    PWCToday Newbie
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    Re: SX 650 with big pin 750 fuel system

    I already ordered a clear 10 micron fuel filter! I was thinking about trying to keep the reserve with a larger, less restricting 3 way valve kept in the engine compartment.

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