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    #1

    Carb/Flange fitting

    Hello everyone, I’m a new user here and also a new GS owner. I recently purchased a 77’ 750. My question is I’m looking to update the carbs and rebuild the top end & gaskets also.

    My carb question is I’m looking at getting Mikuni Tm28’s will I also need the mounting flange for those as well? This might be a beginner question but I haven’t been able to find a definitive answer online.

    Thanks for your time everyone.
    Tags: None
    #2
    Welcome, and what else have you done to the engine?

    Unless you have a big-bore kit with some radical cams, you will not likely be able to use those carbs.

    Why not get the stock bike running and enjoy it as-is for a while?

    .
    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

      #3
      TM28's?? are you sure you have that correct?
      1978 GS1085.

      Just remember, an opinion without 3.14 is just an onion!

      Comment

        #4
        So as far as the engine goes, I haven’t done anything to it. But I know the stock carb size is 26mm, I wasn’t really sure if stepping up a carb size or not would be a huge issue or not.

        The only thing I really wanted out of new carbs was getting away from the vacuum operated system.

        Comment

          #5
          Vacuum operated system?

          What's that?
          1978 GS 1000 (since new)
          1979 GS 1000 (The Fridge, superbike replica project)
          1978 GS 1000 (parts)
          1981 GS 850 (anyone want a project?)
          1981 GPZ 550 (backroad screamer)
          1970 450 Mk IIID (THUMP!)
          2007 DRz 400S
          1999 ATK 490ES
          1994 DR 350SES

          Comment

            #6
            Originally posted by Big T View Post
            Vacuum operated system?

            What's that?

            My first thought was he meant the CV style.

            Comment

              #7
              He has VM slide carb s

              I'm guessing he doesn't understand the vacuum fuel tap
              1978 GS 1000 (since new)
              1979 GS 1000 (The Fridge, superbike replica project)
              1978 GS 1000 (parts)
              1981 GS 850 (anyone want a project?)
              1981 GPZ 550 (backroad screamer)
              1970 450 Mk IIID (THUMP!)
              2007 DRz 400S
              1999 ATK 490ES
              1994 DR 350SES

              Comment

                #8
                Originally posted by Big T View Post
                He has VM slide carb s

                I'm guessing he doesn't understand the vacuum fuel tap

                Ooooh missed the VM detail :P

                Comment

                  #9
                  Originally posted by GrideRide1012 View Post
                  The only thing I really wanted out of new carbs was getting away from the vacuum operated system.
                  Not sure exactly what you think you have there, but the only "vacuum operated system" on your entire bike is the little line that goes from carb #3 to the petcock to turn on the fuel.

                  If that is what you want to get rid of, simply cap it off at the carb fitting, then get ready to turn the fuel ON and OFF every time you ride, but also know that the only way to turn it ON is to turn it to the PRIme setting, which gives you NO reserve tank at all.

                  .
                  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
                    Thanks everyone for the responses. After setting down and familiarizing myself with the system I realize how ridiculous “getting rid of vacuum” sounds. Still learning!

                    So, the next thing I’m curious about and I’ve been researching online and haven’t had much luck. Linking all 4 carbs together? I’ve found pictures of 4 stock carbs linked.

                    Could anyone provide a break down or a diagram of how the system works and is assembled?

                    Comment

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