XS1100 won't run Issues (New Owner, Help appreciated!)

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  • Ccitis
    Truly XSive
    • Jun 2023
    • 136

    #16
    Originally posted by bikerphil
    What about the pilot jets, the ones down in the towers. Are those the correct type? Many rebuild kits have the wrong type and will make it run very rich. I'll post a pic of the correct and incorrect types.

    Incorrect type on left, correct type on the right...

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    Definitely the right ones in there.

    Comment

    • bikerphil
      Master of XSology
      • Jan 2008
      • 8628
      • South Flori-DUH

      #17
      Ok, just checking.
      2H7 (79) owned since '89
      3H3 owned since '06

      "If it ain't broke, modify it"

      Comment

      • DiverRay
        Moderator
        • Nov 2004
        • 7588
        • Star, IDAHO

        #18
        Your first picture of the float height shows me you are NOT measuring it correctly. The measurement needs to be from the lip, not the lower flat between the two lips. This will give you a high float and rich mixture. My guess is you are about 1.5mm off.
        Ray Matteis
        KE6NHG
        XS1100 E '78 (winter project)
        XS1100 SF Bob Jones worked on it!

        Comment

        • Radioguylogs
          XS-XJ Guru
          • Nov 2012
          • 1933
          • Presque Isle, MI

          #19
          Some versions of these carbs have a rubber plug that goes in the pilot jet tower. I notice your carbs don't have the rubber plugs.

          Do you know if there is a passage between the main jet tower and the pilot jet? If there is no passage , then you are OK. If there is a passage, you need the rubber plugs.

          I think the pilot jet is the same size in both cases, so it doesn't seem like this issue would be related to your poor idle.
          Last edited by Radioguylogs; 07-14-2023, 09:39 PM.
          -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

          • DEEBS11
            XS-XJ Guru
            • Feb 2023
            • 1374
            • Connecticut

            #20
            In my 1980 standard carb rack the was one pilot screw that was broken in the #3 carb. I put in a used #3 carb body but found it was from a Special and had the hole that needs the rubber plug. So three of my carbs have no plug and one does. Bike runs like fuel injection. Here is what the plugs look like.





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            • Schming
              XS-XJ Guru
              • Jul 2009
              • 2070
              • Pittsburgh,PA

              #21
              Originally posted by DiverRay
              Your first picture of the float height shows me you are NOT measuring it correctly. The measurement needs to be from the lip, not the lower flat between the two lips. This will give you a high float and rich mixture. My guess is you are about 1.5mm off.
              This thread shows exactly how to set the height - https://xs11.club/forum/idle-talk-fo...s1100-sg/page2
              1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
              1979 XS1100SF (stock-euro mods planned)
              1984 XV700L Virago (to be hot-modded)
              1983 XJ750MK Midnight Maxim (semi-restored DD)
              1977 XS650D ( patiently awaiting resto)

              Sometimes it takes a whole tank of gas before you can think straight.

              Comment

              • DEEBS11
                XS-XJ Guru
                • Feb 2023
                • 1374
                • Connecticut

                #22
                Here is a valuable tool for this:

                This is for 1 Carb Float Level Tool. Specially designed and cnc machined brass fitting with O-ring and Clear fuel line attached. For setting fuel service level (float level). Fits Carbs with 8mm X1 brass drain screws shown in picture.



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                • speedlimit85
                  XStremely XSive
                  • Jan 2017
                  • 420
                  • Gainesville, Fl.

                  #23
                  I have those rubber passage plugs. If one wears out and falls in the bowl, the bike won't run right.
                  80 G

                  Comment

                  • bikerphil
                    Master of XSology
                    • Jan 2008
                    • 8628
                    • South Flori-DUH

                    #24
                    The bowl should have a post on it to prevent the passage plug from falling out.

                    Now if it rots away from ethanol, that's another story.
                    Last edited by bikerphil; 07-15-2023, 08:52 PM.
                    2H7 (79) owned since '89
                    3H3 owned since '06

                    "If it ain't broke, modify it"

                    Comment

                    • Ccitis
                      Truly XSive
                      • Jun 2023
                      • 136

                      #25
                      Originally posted by DiverRay
                      Your first picture of the float height shows me you are NOT measuring it correctly. The measurement needs to be from the lip, not the lower flat between the two lips. This will give you a high float and rich mixture. My guess is you are about 1.5mm off.
                      I am confused... What lip? I see a very very small rise on the rim there... almost imperceptible with the micrometer. Every post I have seen using calipers or a guage shows measuring of the metal gasket surface. Here are some photos... as for the plug, I don't see a passage between the jet passages? Not entirely sure where that would be.


                      Comment

                      • bikerphil
                        Master of XSology
                        • Jan 2008
                        • 8628
                        • South Flori-DUH

                        #26
                        Passageway

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                        2H7 (79) owned since '89
                        3H3 owned since '06

                        "If it ain't broke, modify it"

                        Comment

                        • Ccitis
                          Truly XSive
                          • Jun 2023
                          • 136

                          #27
                          Originally posted by bikerphil
                          Passageway

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                          Ok, no passageway on these carbs.

                          Comment

                          • Ccitis
                            Truly XSive
                            • Jun 2023
                            • 136

                            #28
                            Alright, so I adjusted the float height again based on a few comments.. using the small ridge in the center of the gasket face. The float now sits higher. Also made sure they were bench sycned, and then put them back on the bike to see if there is any difference. I would say the bike starts faster... but still struggles to run at all off enrichener. Dies with the slightest throttle. Also, before I had the carbs off, number 4 pipe would stay cold until the enrichener was removed then it would come online. Now, number 1 does this and 4 comes on fine....

                            Comment

                            • DiverRay
                              Moderator
                              • Nov 2004
                              • 7588
                              • Star, IDAHO

                              #29
                              Double check the pickup coil wires! Use a VOM at the connector for the ICU and pull each wire a little bit. Just a thought.
                              Ray Matteis
                              KE6NHG
                              XS1100 E '78 (winter project)
                              XS1100 SF Bob Jones worked on it!

                              Comment

                              • bikerphil
                                Master of XSology
                                • Jan 2008
                                • 8628
                                • South Flori-DUH

                                #30
                                Originally posted by Ccitis
                                still struggles to run at all off enrichener. Dies with the slightest throttle
                                Sounds like there is still some crud in the pilot circuit.
                                2H7 (79) owned since '89
                                3H3 owned since '06

                                "If it ain't broke, modify it"

                                Comment

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