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1980 gs850g carb issues

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    1980 gs850g carb issues

    My carbs are off and in the hands of a mechanic. Apparently I need two carb bodies, one has a broken float stanchion, and another has the steel mixture screw stuck way down in the seat, it's not budging (CV carbs). I did a quick search on e-bay...no luck. Is there another set I could search for from other years or makes, I did see a set of gs750 CV's 1981 vintage. Will a set of old mikuni 28's work from a KZ (I have those on hand) or are 28s to big for the stock 850?
    Thanks,
    Joe

    #2
    Hi,

    The 1980 and up GS850 uses Mikuni BS32SS carbs. Lots of other GS bikes used those carbs too, with different jetting. If you can find another set from another bike, just clean them up, change the jetting, and you'll be good to go.

    The other carbs probably won't work because of the intake port size on the head.


    Thank you for your indulgence,

    BassCliff
    Last edited by Guest; 03-12-2010, 12:39 AM.

    Comment


      #3
      Any of the GS bikes with displacements from 550 to 850, and built from 1980 and up
      (with the exception of the '83 and newer 550s) use the same basic carb, Mikuni BS32.

      .
      sigpic
      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
      #2 son: 1980 GS1000G
      Family Portrait
      Siblings and Spouses
      Mom's first ride
      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
      (Click on my username in the upper-left corner for e-mail info.)

      Comment


        #4
        Just found several set on e-bay...thanks for the info

        Comment


          #5
          Oops. Sorry!

          I meant Mikuni BS32SS carbs, NOT BS34SS.


          The 34's were used on the bigger bikes.

          I edited my post above.


          Thank you for your indulgence,

          BassCliff
          Last edited by Guest; 03-12-2010, 04:47 AM.

          Comment


            #6
            Get those carbs back from the mechanic and either do it yourself or send them to me.
            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.

            Comment


              #7
              Any of the GS bikes with displacements from 550 to 850, and built from 1980 and up
              (with the exception of the '83 and newer 550s) use the same basic carb, Mikuni BS32.
              According to chef1366 the GS650's carb 2 and 3 are different and will not interchange with the others. Isn't that right chef??

              Comment


                #8
                Hi,

                Carb #2 is where the vacuum is drawn for the petcock. #3 has no sync adjustments. The other carbs must be balanced to #3.



                Thank you for your indulgence,

                BassCliff

                Comment


                  #9
                  Originally posted by almarconi View Post
                  According to chef1366 the GS650's carb 2 and 3 are different and will not interchange with the others. Isn't that right chef??
                  Actually ALL of them are unique.

                  #1 has vent, fuel and throttle shaft connections, all on the right.
                  #2 has vent on the left, fuel and throttle on both sides and a vacuum port for the petcock.
                  #3 has vent on the right, fuel and throttle shaft connections on both sides and the pulley for the throttle cable.
                  #4 has vent, fuel and throttle shaft connections, all on the left.

                  You can swap them with one from a similar position in another rack of carbs, but you can not move them around within the same rack.

                  .
                  sigpic
                  mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                  hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                  #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                  #2 son: 1980 GS1000G
                  Family Portrait
                  Siblings and Spouses
                  Mom's first ride
                  Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                  (Click on my username in the upper-left corner for e-mail info.)

                  Comment


                    #10
                    Originally posted by almarconi View Post
                    According to chef1366 the GS650's carb 2 and 3 are different and will not interchange with the others. Isn't that right chef??
                    The #2 & #3 from the 550s and 650s have different spacing than the 750s and 850s.
                    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.

                    Comment

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