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Mikuni BS32ss oring list

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    Mikuni BS32ss oring list

    Is there a definitive list of oring sizes needed for rebuilding a Mikuni BS32ss from a GS650/GS550? I've looked but haven't been able to find it. My hard parts are all pretty good (except for bodies mentioned in other threads), so I'm trying to buy just the needed orings. I like to buy in bulk from grainger, which turns out to be cheaper than individual items, and then you have left overs.

    I normally use jetsrus, but their list of Mikuni orings doesn't mention BS32ss. The service manual also does not have a list in my scan.

    Looking at my parts and the various fiches, a starting list is below. Is there a better source? If not, does anyone have the sizes? Else I'll just measure the ID's and estimate the cross section diameter.

    Note - I'll update this list as more info comes in.

    Item - Qty - Size
    Intake manifolds - 4 - 38(?)x2.4
    Float bowl drain - 4 - 5.1x1.6
    Needle valve seat - 4 - ?x?
    air mixture screw - 4 - ?x?
    fuel transfer tubes - 8 - ?x?
    air vent T's - 4 - ?x?
    Choke plunger - 4 - 10x1.5

    Did I miss any?

    Thanks
    Last edited by sacruickshank; 12-08-2021, 10:26 AM.
    Current rides: GS650L, GS550T, GL500, GL1100, Bonnie, Triumph Adventurer, Guzzi California

    #2
    All you need to know is in this thread.....

    This area is to be used only for general GS topics. For non-GS related topics, join the Off-Topic usergroup. <b>Technical questions are not to be posted here.</b>
    1978 GS1085.

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

    Comment


      #3
      All the various sizes (intake boot O-rings excepted) are listed in the carb rebuild tutorial linked in my signature...

      o-ring size.jpg
      Last edited by Nessism; 12-08-2021, 10:35 AM.
      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

      Comment


        #4
        Originally posted by Nessism View Post
        All the various sizes (intake boot O-rings excepted) are listed in the carb rebuild tutorial linked in my signature...

        [ATTACH=CONFIG]63662[/ATTACH]
        Perfect, thanks. The link provided earlier seems to have been edited, which makes sense since the poster seems to be going thru some health issues.
        Current rides: GS650L, GS550T, GL500, GL1100, Bonnie, Triumph Adventurer, Guzzi California

        Comment


          #5
          Here's the table as I've collected from the various sources. The only remaining gap is the air vent T's which are close to the fuel transfer tubes in size and don't seal any fuel, so precision isn't as important.
          Item Qty Size AS568 size
          Intake manifolds 4 38x2.4-2.6 -128
          Float bowl drain 4 5.1x1.6
          Needle valve seat 4 7.1x1.6
          air mixture screw 4 2.7x1.13
          fuel transfer tubes 8 6x1.8 -010
          air vent T's 4 same as fuel transfer?
          Choke plunger 4 10x1.5
          CV Inlet (?) ? 7.65x1.63 -903
          Current rides: GS650L, GS550T, GL500, GL1100, Bonnie, Triumph Adventurer, Guzzi California

          Comment


            #6
            Yes, the vent Tee O-rings are the same size as the fuel Tee and transfer tube O-rings.
            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

            Comment


              #7
              Originally posted by Nessism View Post
              Yes, the vent Tee O-rings are the same size as the fuel Tee and transfer tube O-rings.
              Thanks. My fuel T is rubberized, so no orings. Still feels rubbery, not hardened, so I plan to re-use.
              Current rides: GS650L, GS550T, GL500, GL1100, Bonnie, Triumph Adventurer, Guzzi California

              Comment

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