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GS 850 High Idle once warm

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    #1

    GS 850 High Idle once warm

    Howdy!

    I have a GS850 that is idling normal when it is cold. After a few minutes of warming up it idles very high (no choke). I have had the carbs rebuilt and I replaced all of the rubber between the airbox and the head.

    Any ideas then please let me know! If you think its an easy fix and are on the north side of atlanta I will pay in beer for you to look at it!

    Tim
    Tags: None
    #2
    How much higher is the idle? Have you tried to turn the idle down using the idle adjustment screw? It's pretty normal for the idle to change from cold to how by a couple hundred RPMs.
    http://img633.imageshack.us/img633/811/douMvs.jpg
    1980 GS1000GT (Daily rider with a 1983 1100G engine)
    1998 Honda ST1100 (Daily long distance rider)
    1982 GS850GLZ (Daily rider when the weather is crap)

    Darn, with so many daily riders it's hard to decide which one to jump on next.;)

    JTGS850GL aka Julius

    GS Resource Greetings

    Comment

      #3
      I get idle between 2000 and 2500 once it is warmed up. I had tried adjusted the idle adjust screw before the carbs were done. I will try that again this afternoon.

      Comment

        #4
        Carb mount boot "O" rings.

        V
        Gustov
        80 GS 1100 LT, 83 1100 G "Scruffy"
        81 GS 1000 G
        79 GS 850 G
        81 GS 850 L
        83 GS 550 ES, 85 GS 550 ES
        80 GS 550 L
        86 450 Rebel, 70CL 70, Yamaha TTR125
        2002 Honda 919
        2004 Ural Gear up

        Comment

          #5
          What year 850? That will determine what suggestions shoud be for mixture screw(s).

          .
          sigpic
          mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
          hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
          #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
          #2 son: 1980 GS1000G
          Family Portrait
          Siblings and Spouses
          Mom's first ride
          Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
          (Click on my username in the upper-left corner for e-mail info.)

          Comment

            #6
            It is an '82. The carb mount o rings were replaced when my brother and I did all of the other rubber.

            I did adjust the idle screw and it went down to ~15-1600. I have not had a chance to play with it more as it was raining when I rode in this evening.

            It also runs great when putzing around town. It only has any issues that I have noticied at idle.
            Last edited by Guest; 06-09-2015, 07:04 PM.

            Comment

              #7
              What is the setting on the pilot (mixture) screws? These are the screws on the top of the outlet of the carbs.

              When stock, they are covered by plugs to seal them for EPA purposes, but they were FAR too lean for proper running.

              To start tuning, turn them all the way IN until they seat lightly, then back them out three full turns. It will be a little rich, but it will run. When the bike is warmed up a bit, slowly turn each mixture screw in a bit, listening for best idle speed, then continue with the next carb. When you are done, you may find that the screws are about 2.5 or so turns out, but it's easier to tune from a rich-running engine than a lean-running one.

              .
              sigpic
              mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
              hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
              #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
              #2 son: 1980 GS1000G
              Family Portrait
              Siblings and Spouses
              Mom's first ride
              Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
              (Click on my username in the upper-left corner for e-mail info.)

              Comment

                #8
                Check the seals on the head with carb spray while running and see if the idle changes. You may have pinched an o-ring or you have a leaky air box.
                1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                1985 GS1150ES stock with 85 Red E bodywork.

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