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    Questions about 650 motor

    Might be considering another project.

    What size are the piston pins?
    Do 650 and 750/850 barrels share the same stud spacing?
    750 head work on 650 motor? (oil passages the same, etc.)

    TIA,

    Daniel

    #2
    Don't think they're going to be compatable with 750/850 stuff at all or someone would have done it by now...
    There are "big" bore kits available, however I think you'll find the stock 650 to be more potent than you might think. Weighs much less than the 850 and puts nearly the same power to the ground...

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      #3
      The cylinder spacing on the 550 and 650 are the same but different to the 750/850.
      1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
      1985 GS1150ES stock with 85 Red E bodywork.

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        #4
        Next question then...

        Will a '79 850G or '81 1000G fit in an '82 GS650G frame?

        Daniel

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          #5
          Don't think it will work.

          The Large Inline's are about 21 inches long-frame to frame
          The Height is about 18Inches Plus-for the motor

          You will be easily hitting the gastank at 18 inches on the 82 650G
          Guess you could raise the tank?

          You might be able to cram the motor in there, but the mounts might differ slightly.

          I'm not sure what your fab skills are?

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