VERY high idle

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  • Mike

    #1

    VERY high idle

    Finally got everything back together and the bike is idling at around 5k. Moved the idle screw around, and it made zero difference. Adjustment screws all the way in made zero difference. I'm guessing it's running really rich, but I'm not sure why since it ran and idled fine just a couple days ago.
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35786
    • Torrance, CA

    #2
    Did you replace the intake boot O-rings?
    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

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    • JEEPRUSTY

      #3
      Check the throttle cable routing.

      Also checck to see that it has not bound up inside the twist grip housing.
      Happened to me once. It was feaky.

      Comment

      • tom203
        Forum Guru
        Past Site Supporter
        • Aug 2010
        • 8925
        • Norway,Maine

        #4
        Originally posted by JEEPRUSTY
        Check the throttle cable routing.

        Also checck to see that it has not bound up inside the twist grip housing.
        Happened to me once. It was feaky.
        Yes, make sure cable is not holding throttle plates open- doesn't take much to have a wild idle!
        1981 gs650L

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

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        • Mike

          #5
          Originally posted by Nessism
          Did you replace the intake boot O-rings?
          not yet, but wouldn't that make it run very lean, not just give it a high idle?

          Comment

          • Mike

            #6
            Originally posted by JEEPRUSTY
            Check the throttle cable routing.

            Also checck to see that it has not bound up inside the twist grip housing.
            Happened to me once. It was feaky.
            Originally posted by tom203
            Yes, make sure cable is not holding throttle plates open- doesn't take much to have a wild idle!
            Checked that, both throttle plates were barely open

            Comment

            • Mike

              #7
              Took both carbs out to check the bench sync. Both were completely closed, so I opened them up a bit just to check, got them even again, and still the same thing. Intake boot o-rings the next step?

              Comment

              • SVSooke

                #8
                Check the last posts in this thread:http://www.thegsresources.com/_forum...d.php?t=165809 #30 to be exact.

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                • Nessism
                  Forum LongTimer
                  GSResource Superstar
                  Past Site Supporter
                  Super Site Supporter
                  • Mar 2006
                  • 35786
                  • Torrance, CA

                  #9
                  Originally posted by Mike
                  not yet, but wouldn't that make it run very lean, not just give it a high idle?
                  Yes, classic GS problem...one of the most common. That's why I mentioned it in this and in your other thread too.
                  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

                  • Guest

                    #10
                    One thing I noticed with my '82 450E is that there are two locating holes in the throttle tube for the throttle cable.

                    When I was putting mine back on the other week, I had to move it to the second hole because the first one was holding the cable too short, sort of like what SVSooke posted the link about.

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                    • Mike

                      #11
                      Originally posted by SVSooke
                      Check the last posts in this thread:http://www.thegsresources.com/_forum...d.php?t=165809 #30 to be exact.
                      I checked the throttle cable and it's not caught up on anything. I checked the butterflies while the carbs were on and they were pretty much completely closed off

                      Comment

                      • Mike

                        #12
                        Originally posted by Nessism
                        Yes, classic GS problem...one of the most common. That's why I mentioned it in this and in your other thread too.
                        Cool, thanks. Ordered some.

                        I guess I can be thankful that it's supposed to rain next week so I'm not missing anything.

                        Comment

                        • Vantreeseba

                          #13
                          I'm having the same issue mike, and was just wondering if the o-rings fixed it, I already ordered some, but they haven't come in yet, and wanted to know if I needed to continue the detective work, or just wait it out :P

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