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1977 gs550 vm28

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    1977 gs550 vm28

    So I just bought my first motorcycle (wanted to start a new hobby)it only would sputter when I first got it but when I went to take off the carbs I realized the carbs are VM28s rather than stock VM22s should the bike still be able to run with these carbs? The PO also put Air Pod filters and removed the air box. Did I bite off more than I can chew??? 😅

    #2
    28's are pretty big for a 550. Suzuki used 26's on the 750/850/1000 so that should give you some idea.
    Ed

    To measure is to know.

    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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      #3
      The 28s should have much wider spacing that 22s.
      How do they fit?
      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

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        #4
        So in between the boot and head is like a metal block reducer that reduces the opening size. I’ll try to upload a picture
        Attached Files
        Last edited by Guest; 07-24-2019, 06:56 PM.

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          #5
          How the boot sat on the reducer
          Attached Files

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            #6
            They aren't by chance 29mm smoothbores?
            Seems like a lot of fab work to to use 28s.
            Stock engine? Is it an old track bike?
            2@ \'78 GS1000

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              #7
              It is stock engine and the previous owner didn’t mention it was an old track bike. I just thought they were 28mm because the boots have vm28-200 stamped on them. Here’s a pic of the carbs
              Attached Files

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