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O rings in float bowl

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  • O rings in float bowl

    Finally had some time to take the bike out yesterday and it wouldn't start

    Sorted that out and turns out 1 and 3 aren't firing. Had spark, it's time to suck it up and clean the carbs.

    https://photos.app.goo.gl/YuePkYjqNtWD4Xdk9

    It's pretty easy to see what the problem is, there's an o ring in various stages of decomposition in the bottom of EVERY bowl. I got what I could apart, took a few pictures hoping someone could point me in the right direction on where this o-ring came from and where to buy a new one.

    https://photos.app.goo.gl/nav6cnsa5JcGvWKy7

    https://photos.app.goo.gl/234Ju2G52dPtMHz1A


    This one was REALLY dirty
    https://photos.google.com/photo/AF1Q...NEf2L4_ny0z89A


    If I had to guess, it came from here.
    https://photos.app.goo.gl/332HTVV1a81gAimg9


    A few of these bolts felt funny when they came out, I think there might be some tread stripping or corrosion. I marked the top EZ to remind myself not to crank them down.
    https://photos.app.goo.gl/Jd18kUv33GGD2gfw6

    End of the night picture
    https://photos.app.goo.gl/sDw2P8W32fi25MkS6
    78 E

  • #2
    Who was the last person to work on the carbs?
    It looks like they thought you had the later model carbs with "O" rings, and NOT the early WITHOUT. You should be able to just clean the carbs and re-assemble, set the float levels, bench sync, and install. You WILL need to do a proper sync and mixture setting once on.
    Ray Matteis
    KE6NHG
    XS1100 E '78 (winter project)
    XS1100 SF Bob Jones worked on it!

    Comment


    • #3
      Thanks Phil!!

      The PO rebuilt them before I bought the bike. It always started so i never had a reason to open the carbs until now.
      78 E

      Comment


      • #4
        Alright Alan, fess up:

        http://www.xs11.com/forum/showthread.php?t=42899

        Hope you have a sense of humor.
        -Mike
        _________
        '79 XS1100SF 20k miles
        '80 XS1100SG 44k miles
        '81 XS1100H Venturer 35k miles
        '79 XS750SF 17k miles
        '85 Honda V65 Magna ~7k miles
        '84 Honda V65 Magna 48k miles (parts bike)
        '86 Yamaha VMAX 9k miles

        Previous: '68 Motoguzzi 600cc + '79 XS750SF 22k miles +'84 Honda V65

        Comment


        • #5
          That's too funny!!! Selective memory I guess
          78 E

          Comment


          • #6
            You got the carbs down that far be sure to replace the throttle shaft seals .
            Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
            Current rides:
            80 XS1100SG
            82 JX1100
            83 Venture Royale
            86 V-Max

            Comment


            • #7
              Is there a walkthrough or tech tip on the butterflies?
              78 E

              Comment


              • #8
                Originally posted by alaskey2 View Post

                If I had to guess, it came from here.
                https://photos.app.goo.gl/332HTVV1a81gAimg9
                There are no threads around the fuel valve body. It is supposed to have a fiber-washer gasket if it is a 78 carb, not an o-ring. I suspect you have a transitional 78/80 carb bank.
                Skids (Sid Hansen)

                Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.
                03 Honda ST1300 ABS

                Comment


                • #9
                  What I meant to say is “79/80” transitional carbs.
                  Skids (Sid Hansen)

                  Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.
                  03 Honda ST1300 ABS

                  Comment


                  • #10
                    Hey Skids,

                    The Carbs have an E on the bottom, does that help identify anything?

                    And for everyone else, should I have plugs in the sides of the carbs without a fuel T? See picture below. Only one carb has a plug there,

                    https://photos.app.goo.gl/ccaTV7Qxo7JHUCue8
                    78 E

                    Comment


                    • #11
                      Originally posted by alaskey2 View Post
                      Hey Skids,

                      The Carbs have an E on the bottom, does that help identify anything?

                      And for everyone else, should I have plugs in the sides of the carbs without a fuel T? See picture below. Only one carb has a plug there,

                      https://photos.app.goo.gl/ccaTV7Qxo7JHUCue8
                      Is the bottom port drilled all the way through??? If so, it is a fuel feed. The model E carbs had ports above the fuel feeds to accomadate breather tees that ran two hoses back to the air box. Did the pilot jets have screw-on caps?
                      Skids (Sid Hansen)

                      Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.
                      03 Honda ST1300 ABS

                      Comment


                      • #12
                        Those carbs are the early type, 78-79. Those plugs on the sides of the 1 and 4 carbs mean nothing, cosmetic only. Also, that O ring in your first pic doesn't belong to your type carbs, you don't need those.
                        Last edited by bikerphil; 07-16-2019, 08:52 AM.
                        2H7 (79)
                        3H3

                        "If it ain't broke, modify it"

                        Comment


                        • #13
                          I got the carbs back together, did a little bench sync. All four cylinders are firing, but the bike isn't returning to idle as quickly as I remember. Also, when I was trying to get a video of this, the throttle ran away (RPMs increasing on their own). Video below if anyone wants to chime in on that.

                          https://photos.app.goo.gl/H4LitQpevBvhwJcC7



                          I also can't get the tab at the front of the seat pan to stay under the frame bracket, but that's probably just misalignment.
                          78 E

                          Comment


                          • #14
                            The butterfly seals are a C. Not a standard o'ring. Many Mikuni carburetors use the same one. OEM is readily available. Mike's XS has them aftermarket. The BS38 & BS34 on the XS650 use the same seals.
                            Marty (in Mississippi)
                            XS1100SG
                            XS650SK
                            XS650SH
                            XS650G
                            XS6502F
                            XS650E

                            Comment


                            • #15
                              Until carbs are synced with gauges, you can't depend on the idle working.
                              Ray Matteis
                              KE6NHG
                              XS1100 E '78 (winter project)
                              XS1100 SF Bob Jones worked on it!

                              Comment

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