Doesn't drop back to idle right away...???

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  • Hammerhead1st
    XStremely XSive(Deceased)
    • Jul 2007
    • 330
    • Lawrencvile, GA

    #1

    Doesn't drop back to idle right away...???

    Ok...synch'd the carbs in prep for the Syracuse meet n greet, and suddenly, the bike wont drop back to idle right away. Instead, it seems to hang at high r's for a few secs, then drops back to idle.

    All the mix screws are set at 1 1/2 out, all carbs are synch'd damn near perfectly. Thought it might be a sticky throttle issue, but no, it isnt. Any ideas?
    "Rat Rod"
    79 XS1100 Standard
    87 VMAX cans
    Cheap Japanese Tires
    Cobalt Blue Rattle Can Paint
    Custom Lighting on a Budget

    Perry Center Fire Department
    Perry Emergency Ambulance

    "If we don't do it, who will?"


    Some people have one of those days, I have one of those lives...
  • prometheus578
    XS-XJ Super Guru (RESIGNED)
    • Aug 2004
    • 4012
    • Olympia , Wa.

    #2
    Check for a vacuum leak. Probably with your 25 year old vacuum port caps from when you synch'ed her.
    "Damn it Jim, I'm a doctor, not a mechanic!' ('Bones' McCoy)

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    • Hammerhead1st
      XStremely XSive(Deceased)
      • Jul 2007
      • 330
      • Lawrencvile, GA

      #3
      I replaced the caps last month with brandy-new ones, but will check for leaks anyhow...Thanks man.
      "Rat Rod"
      79 XS1100 Standard
      87 VMAX cans
      Cheap Japanese Tires
      Cobalt Blue Rattle Can Paint
      Custom Lighting on a Budget

      Perry Center Fire Department
      Perry Emergency Ambulance

      "If we don't do it, who will?"


      Some people have one of those days, I have one of those lives...

      Comment

      • blue giant
        XSive Maximus
        • Aug 2007
        • 880
        • Ontario, Canada

        #4
        I had a similiar problem last weekend when I synced mine, turned out I wasn't synced at all, one of the butterflies (Carb #4) was closing sooner than the rest causing the idle to hang up. Sometimes a blip of the throttle would bring down, sometimes not. I didn't find the problem until I removed he carbs and could visually see what was happening.

        Hope this helps,

        Paul
        Paul
        1983 XJ1100 Maxim
        1979 XS1100 Standard
        1980 XS1100 Special

        I'm not a motorcycle mechanic but I play one on the internet.

        Comment

        • Hammerhead1st
          XStremely XSive(Deceased)
          • Jul 2007
          • 330
          • Lawrencvile, GA

          #5
          Paul,

          How'd you fix it? Pre-synch?
          "Rat Rod"
          79 XS1100 Standard
          87 VMAX cans
          Cheap Japanese Tires
          Cobalt Blue Rattle Can Paint
          Custom Lighting on a Budget

          Perry Center Fire Department
          Perry Emergency Ambulance

          "If we don't do it, who will?"


          Some people have one of those days, I have one of those lives...

          Comment

          • blue giant
            XSive Maximus
            • Aug 2007
            • 880
            • Ontario, Canada

            #6
            Originally posted by Hammerhead1st
            Paul,

            How'd you fix it? Pre-synch?
            Yes, the wire twist tie method.!

            Worked very well too.

            Paul
            Paul
            1983 XJ1100 Maxim
            1979 XS1100 Standard
            1980 XS1100 Special

            I'm not a motorcycle mechanic but I play one on the internet.

            Comment

            • Crazcnuk
              XS-XJ Guru
              • Aug 2006
              • 2980
              • Hinton, AB, Canada

              #7
              I had the same problem, and it was the throttle cable. It had started breaking up at the throttle grip.

              It broke a couple days later.
              Nice day, if it doesn't rain...

              '05 ST1300
              '83 502/502 Monte Carlo for sale/trade

              Comment

              • xsilerating
                XStremely XSive
                • Dec 2006
                • 430
                • Eastern Ontario, Canada

                #8
                You may want to try turning down your fast idle screw - just a tad - your adjustments may have resulted in a very slight increase on the 'rich' side.

                I've had this happen a couple of times, the last after a mechanic adjusted the carbs for me.

                Ron
                1980 XS11 LG (Diablo)
                1980 XS11 G (Bagger)
                1978 XS11 G (White Knight)
                1978 XS11 G (Skeleton)
                2016 SS (S.S. Flyer)

                Comment

                • AlanB
                  XSive Maximus
                  • Oct 2006
                  • 705
                  • Scotland

                  #9
                  Hi Hammerhead,

                  Still sounds like a synch problem....... What did you use to synch 'em?
                  I have had problems with almost every set of "Gauge-type" balancers I have tried........... If you use "gauges", try swapping 'em onto different cylinders after you have finished; The results can be quite illuminating!

                  AlanB
                  If it ain't broke, modify it!

                  Comment

                  • 79XS11F
                    XS-XJ Super Guru
                    • Jul 2006
                    • 3563
                    • Ottawa, Ont. Canada

                    #10
                    If the throttle cable is not sticking and adjusted properly then check for smooth operation of the butterfly valves and if their good then you most likely have a air leak to find and plug.
                    Rob
                    KEEP THE RUBBER SIDE DOWN

                    1978 XS1100E Modified
                    1978 XS500E
                    1979 XS1100F Restored
                    1980 XS1100 SG
                    1981 Suzuki GS1100
                    1983 Suzuki GS750S Katana
                    1983 Honda CB900 Custom

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