Announcement

Collapse
No announcement yet.

1981 GS550L High Idle and Hanging Idle

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    1981 GS550L High Idle and Hanging Idle

    What I've done to the bike:

    - Cleaned the carburetors
    - New intake boots
    - New airbox boots
    - New O-ring for intake
    - Weather stripped airbox
    - New and oiled air filter

    I set my pilot air screws at 2.5 turns and can start the bike and set idle to 1150~ but when I twist the throttle it will hang. So I have tested turning the pilot air screws out .5 up until 4 turns out, and the bike will idle too high, still have hang, and the idle adjustment knob is completely turned out, closing the butterfly valve.

    I'm completely lost. Any advice would be great.
    Tags: None
    #2
    Do you have smooth throttle cable operation/lubrication? Does the throttle tube snap back when you let go? Does the routing of the choke cable foul the throttle linkage on the carbs, causing the throttle to hang or return slowly?
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200
    BikeCliff's / Charging System Sorted / Posting Pics
    Destroy-Rebuild 750T/ Destroy-Rebuild part deux

    Comment

      #3
      Yes, they've been lubricated and the throttle snaps back quickly when I let go. The cable returns correctly and has the correct slack as well...

      Comment

        #4
        Double check for any air leaks. Then triple check.
        1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

        2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

        Comment

          #5
          Don't see vacuum sync...
          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

            #6
            Wouldn't I need to adjust the pilot air screws until highest idle and then decrease to 1200~ rpm for vacuum synch? I'm getting 4000 rpm when I have highest idle with pilot air screws adjusted and the idle knob is completely unscrewed with the butterflies completely shut.

            Comment

              #7
              Would worn emulsion tubes and needles cause hanging idle?
              1982 GS1100G- road bike
              1990 GSX750F-(1127cc '92 GSXR engine)
              1987 Honda CBR600F Hurricane

              Comment

                #8
                Originally posted by kylekochan View Post
                Wouldn't I need to adjust the pilot air screws until highest idle and then decrease to 1200~ rpm for vacuum synch? I'm getting 4000 rpm when I have highest idle with pilot air screws adjusted and the idle knob is completely unscrewed with the butterflies completely shut.
                Sounds like a vacuum leak somewhere, and a pretty good one at that. With such a large leak it may show up if you spray some WD-40 on the carb intakes and around the throttle shafts. Worth a try anyway.
                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

                  #9
                  Are you absolutely sure that “choke” is fully off...plungers completely retracted?
                  1981 gs650L

                  "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                  Comment

                    #10
                    I am having what sounds like an identical issue on a 78 GS 1000. I have done all you have as well, very strange as it seems to run well otherwise.

                    Comment

                    Previous template Next
                    Working...
                    X