Small o-ring under carb bowl gasket

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  • darrell3001
    Forum Apprentice
    • Dec 2018
    • 60
    • Grew up in (very) rural North East Texas; Now live in sunny Carlsbad, CA (near San Diego)

    #1

    Small o-ring under carb bowl gasket

    Hello all,

    Rebuilding the carbs on 1983 GS1100ED. So in reading the shop manual, there is a picture of a small o-ring that fits between the bowl and the bowl gasket. In fact, the shop manual calls out being very careful to make sure its aligned when reassembling. During my disassembly, i found that none of my 4 carbs had this o-ring installed. The rebuild kit that i got of Amazon contained a small o-ring that fit in that location so i was careful to align it and get is seated when i reconnected the bowl. However, on one of the bowls, i had to remove it after i had everything reattached. Of course, i forgot about this small o-ring and lost it during this removal. So, im now short one o-ring. I thought i would just order one off of Partszilla. However, in looking at the parts diagram, this small o-ring is not shown. So, questions:

    1) What is this o-ring used for? It appears to be giving space for a very, very tiny orifice.
    2) Since the carb did not have it installed previously, is it actually needed? Seems like the gasket covering the opening would do the same thing.
    3) If i do need it, can someone point it out on the parts diagram? Can you just tell me the number on the diagram so i can order a new one?

    Best Regards,

    Darrell
    Darrell
    1983 GS1100ED (red) / 1983 GS1100ED (blue)
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35787
    • Torrance, CA

    #2
    Can you add a photo?

    Edit: that O-ring sounds like the one that seals off the metal plug passing through to the carb throat. The plug is taper shaped and wedges into place in the carb body but on occasion they pop loose, thus the O-ring. Most people don't worry about them but in my opinion they are a good idea to use. You should be able to find a suitable O-ring in a Harbor Freight kit or at a good hardware store.
    Last edited by Nessism; 04-29-2021, 05:23 PM.
    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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    • darrell3001
      Forum Apprentice
      • Dec 2018
      • 60
      • Grew up in (very) rural North East Texas; Now live in sunny Carlsbad, CA (near San Diego)

      #3
      Page from service manual

      IMG_9023.jpg


      Page from service manual
      Darrell
      1983 GS1100ED (red) / 1983 GS1100ED (blue)

      Comment

      • darrell3001
        Forum Apprentice
        • Dec 2018
        • 60
        • Grew up in (very) rural North East Texas; Now live in sunny Carlsbad, CA (near San Diego)

        #4
        IMG_9022.jpg

        Closer pix of service manual pix
        Darrell
        1983 GS1100ED (red) / 1983 GS1100ED (blue)

        Comment

        • darrell3001
          Forum Apprentice
          • Dec 2018
          • 60
          • Grew up in (very) rural North East Texas; Now live in sunny Carlsbad, CA (near San Diego)

          #5
          Pix of actual carb..

          IMG_9021.jpg
          Darrell
          1983 GS1100ED (red) / 1983 GS1100ED (blue)

          Comment

          • salty_monk
            Forum LongTimer
            GSResource Superstar
            Past Site Supporter
            Super Site Supporter
            • Oct 2006
            • 14001
            • London, UK to Redondo Beach, California

            #6
            I've never used an O-ring there although I'm sure Ed is right (he usually is!)
            1980 GS1000G - Sold
            1978 GS1000E - Finished!
            1980 GS550E - Fixed & given to a friend
            1983 GS750ES Special - Sold
            2009 KLR 650 - Sold - gone to TX!
            1982 GS1100G - Rebuilt and finished. - Sold
            2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

            www.parasiticsanalytics.com

            TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

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