Mikuni carb help for identification

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  • boris.h
    • Jan 2026
    #1

    Mikuni carb help for identification

    Hi everyone

    I bought a set of mikuni carbs for my project.
    I can not identify them (do not know about where they come). Could someone help me to identify them? Then it would be easier for me to find boots, jets... thanks

    - holes pattern = 77 - 93 - 77
    - inside diameter = 34mm
    - outside diameter (boots side) = 42mm
    - outside diameter (airbox side) = 50mm
    - brand = mikuni

    - picture:


    thanks in advance!
    Tags: None
    • tom203
      Forum Guru
      Past Site Supporter
      • Aug 2010
      • 8925
      • Norway,Maine
      #2
      The 34 ID says it might be off a gs1000 or gs1100. Take off a fuel bowl and remove a main jet for clues (see if you can read numbers). Someone on here can confirm spacing.
      1981 gs650L

      "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

        Comment

        • Steve
          GS Whisperer
          • Jun 2005
          • 35924
          • southwest oHIo
          #3
          The "choke" linkage is from '80 or '81.

          .
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          #2 son: 1980 GS1000G
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            Comment

            • Vmass
              Forum Guru
              Past Site Supporter
              • Apr 2011
              • 6100
              • Massachusetts
              #4
              Looks like the # 3 diaphragm cover is incorrect.

                Comment

                • huntb
                  #5
                  Originally posted by Vmass
                  Looks like the # 3 diaphragm cover is incorrect.
                  That's just the metal bracket for holding the throttle cable.

                  These carbs look identical to the BS32's on my 650E... obviously the 34mm measurement indicates that they are not off of a 650E though

                    Comment

                    • JTGS850GL
                      Forum Guru
                      Past Site Supporter
                      • Aug 2013
                      • 9735
                      • GA
                      #6
                      Those are either a 1980-81 GS1000 or GS1100 carb set. Take a picture of the other side and it may give a definitive answer. The primary difference is with the main air jets. The main air jet is pressed in and not easily replaceable. If the whole in the main air jet is 1.7mm then they are 1000 carbs. If the hole is 1.2mm then they are 1100 carbs.
                      http://img633.imageshack.us/img633/811/douMvs.jpg
                      1980 GS1000GT (Daily rider with a 1983 1100G engine)
                      1998 Honda ST1100 (Daily long distance rider)
                      1982 GS850GLZ (Daily rider when the weather is crap)

                      Darn, with so many daily riders it's hard to decide which one to jump on next.;)

                      JTGS850GL aka Julius

                      GS Resource Greetings

                        Comment

                        • rudeman
                          #7
                          SUDCO still carries all the jets and replacement parts for these carbs. regardless of whether they're from a GS1000 or GS1100, the style of jets is the same.

                          Originally posted by boris.h
                          Hi everyone

                          I bought a set of mikuni carbs for my project.
                          I can not identify them (do not know about where they come). Could someone help me to identify them? Then it would be easier for me to find boots, jets... thanks

                          - holes pattern = 77 - 93 - 77
                          - inside diameter = 34mm
                          - outside diameter (boots side) = 42mm
                          - outside diameter (airbox side) = 50mm
                          - brand = mikuni

                          - picture:


                          thanks in advance!

                            Comment

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