#4 dumping gas

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  • thewiz
    XS-XJ Guru
    • Oct 2006
    • 1115
    • Wilksboro, NC

    #16
    I believe your carbs are

    BS 34 III .... earlier models E, F, and SF were BS 34 II. Different animal.
    80G Mini-bagger
    VM33 Smooth bores, Pods, 4/1 Supertrapp, SS brake lines, fork brace

    Past XS11s

    79F Stone stocker and former daily driver, sold May '10 now converting for N.O. to cafe style
    79SF eventually dismantled for parts
    79F Bought almost new in 80, sold for a house
    79F The Ernie bike sold to a Navy dude summer 08
    79SF Squared-off Special, Vetter/Bates tour pkg., Mikes XS coils, G rear fender and tail light. Sold June 09

    Comment

    • 81xsproject
      XS-XJ Super Guru
      • Nov 2004
      • 3185
      • Fortuna, CA

      #17
      I thought the FJ carbs were the type III's...?
      '81 XS1100 SH

      Melted to the ground during The Valley Fire

      Sep. 12th 2015

      RIP

      Comment

      • XSPastor
        XSive Maximus
        • Oct 2007
        • 602
        • Gaithersburg, MD

        #18
        The Clymer manual says that the 1980 SG and LG have Mikuni BS34-III 3J6-00 carbs. The 1980 G has BS34-III 3H5-00 carbs.

        Tim
        Tim Ripley - Gaithersburg, MD
        1981 XS1100 Special "Spoiled Rotten" Just sold - currently bikeless!!
        23mm float height
        120 main jets
        42.5 pilot jets
        drilled stock airbox with K&N
        Jardine 4 to 1 Exhaust
        spade fusebox
        1st and 2nd gear fix

        Comment

        • DiverRay
          Moderator
          • Nov 2004
          • 7605
          • Star, IDAHO

          #19
          Tim,
          Yamaha phased in the carbs.... Some of the early builds had the older carbs, and then they all had the "new" carbs by the end of the model year. It is possible to have the early BS 34 II on the SG.
          Ray Matteis
          KE6NHG
          XS1100 E '78 (winter project)
          XS1100 SF Bob Jones worked on it!

          Comment

          • XSPastor
            XSive Maximus
            • Oct 2007
            • 602
            • Gaithersburg, MD

            #20
            Ahhhh. Thanks, Ray!

            Tim
            Tim Ripley - Gaithersburg, MD
            1981 XS1100 Special "Spoiled Rotten" Just sold - currently bikeless!!
            23mm float height
            120 main jets
            42.5 pilot jets
            drilled stock airbox with K&N
            Jardine 4 to 1 Exhaust
            spade fusebox
            1st and 2nd gear fix

            Comment

            • SanDiegoMike
              Truly XSive
              • Oct 2005
              • 192
              • Near the beach!

              #21
              Is the model # stamped on the carb body somewhere, or is there a difference in the design that let's you know which carb you're dealing with?
              Hi...my name is Mike, and I'm a lane-splitter.
              '80 XS1100SG (mine)
              '87 CMX450C Rebel (daughter's first bike)

              Comment

              • John
                XS-XJ Super Guru
                • Oct 2003
                • 5117

                #22
                The quickest way to tell them apart is the 80-81 carbs have four orifices around the carb inlet, the 80-81's had thre, and the 78-79's had two sets of T fittings between the carbs. The upper set is for the bowl vents, the lower set is the fuel inlet.

                Comment

                • thewiz
                  XS-XJ Guru
                  • Oct 2006
                  • 1115
                  • Wilksboro, NC

                  #23
                  Pretty certain ...

                  You have the III's... no vent hose that looks like the fuel line between 1&2 carb and 3&4, right? ....

                  I'm on my way to wally world, out near you give me a call if you're home and I'll take a peek before the sun goes down.
                  80G Mini-bagger
                  VM33 Smooth bores, Pods, 4/1 Supertrapp, SS brake lines, fork brace

                  Past XS11s

                  79F Stone stocker and former daily driver, sold May '10 now converting for N.O. to cafe style
                  79SF eventually dismantled for parts
                  79F Bought almost new in 80, sold for a house
                  79F The Ernie bike sold to a Navy dude summer 08
                  79SF Squared-off Special, Vetter/Bates tour pkg., Mikes XS coils, G rear fender and tail light. Sold June 09

                  Comment

                  • SanDiegoMike
                    Truly XSive
                    • Oct 2005
                    • 192
                    • Near the beach!

                    #24
                    Back together!

                    And running pretty good from what I can tell so far. Idle is still just a bit rough, but it's steady...no more stalling at intersections, and most importantly, no more of that surging that I was getting before. I still need to get the sync done (Soccer4M, I'll be calling you soon!), and I'm really curious to see how my mileage will be affected. It seems that I have to apply a lot LESS throttle now than before to get up to and maintain speed. Of course, that could also be because I've been riding my daughter's bike for the last week, and it has a much more difficult time hauling my largeness around!
                    Hi...my name is Mike, and I'm a lane-splitter.
                    '80 XS1100SG (mine)
                    '87 CMX450C Rebel (daughter's first bike)

                    Comment

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