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1981 GS850G Carb Issue

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    #1

    1981 GS850G Carb Issue

    I have a GS850 which has been sitting for about 6 years. I bought a different carb set from a running bike and it starts with the choke on and runs between 3000 and 4000 rpm for about 2 minutes. The idle then slowly goes down, not right away, but about after another minute it final chokes and dies. If I pump the trottle I can keep it running. It will not start if the choke is not on.

    Does this provide any details to anyone that could pinpoint what the issue could be. I am not a carb expert by any stretch so any advice would be appreciated.

    Thanks.
    Tags: None
    #2
    Starting with choke is normal if the engine isn't already warm.

    A lot of things have to be right for the bike to work well, but once they're right, it will be reliable. Have you adjusted the valves, sealed the intake and rebuilt the carbs? Are there any non-stock intake or exhaust parts? Is anything missing form the intake system? These new carbs came from another 850?
    Dogma[SIZE=1]
    --
    [SIZE=1]O LORD, be gracious to me; heal me, for I have sinned against you! - David

    Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan[/SIZE]
    --
    [/SIZE] '80 GS850 GLT
    '80 GS1000 GT
    '01 ZRX1200R

    [URL="http://www.thegsresources.com/_forum/showthread.php?244817-Forum-software-change-needed-to-REMOVE-VORTEX-from-quot-New-Posts-quot-feed&p=2371113#post2371113"][SIZE=1]How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex[/SIZE][/URL]

    Comment

      #3
      Don't mean to post a dumb question. But since putting on the new carbs have you adjusted the main idle? could be as simple as that.
      Rob
      1983 1100ES, 98' ST1100, 02' DR-Z400E and a few other 'bits and pieces'
      Are you on the GSR Google Earth Map yet? [URL]http://www.thegsresources.com/_forum/showthread.php?t=170533[/URL]

      Comment

        #4
        Both of those answers are correct, but not quite complete.

        The carbs have to be cleaned and have new o-rings installed.

        .
        [SIGPIC][/SIGPIC]
        mine: [URL="http://tinyurl.com/btyzw4z"]2000 Honda GoldWing GL1500SE [/URL]and [URL="http://tinyurl.com/o6vqacs"]1980 GS850G'K'[/URL] "Junior"
        hers: [URL="https://tinyurl.com/yaapydtv"]1982 GS850GL[/URL] - [URL="http://tinyurl.com/cospp3s"]"Angel" [/URL]and [URL="http://tinyurl.com/bqnpjx9"]1969 Suzuki T250 Scrambler [/URL]
        #1 son: [URL="http://tinyurl.com/d7c8duu"]1986 Yamaha Venture Royale 1300 [/URL]and [URL="http://tinyurl.com/ou7k3lp"]1982 GS650GL[/URL] "Rat Bagger"
        #2 son: 1[URL="http://tinyurl.com/buxhls6"]980 GS1000G [/URL]
        [URL="http://tinyurl.com/d4ojmal"]Family Portrait [/URL]
        [URL="http://tinyurl.com/cbo3ojk"]Siblings and Spouses[/URL]
        [URL="http://tinyurl.com/ctr8k54"]Mom's first ride[/URL]
        [B]Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM) [/B]
        [SIZE=1](Click on my username in the upper-left corner for e-mail info.)[/SIZE]

        Comment

          #5
          I have not adjusted the valves. I have made sure the seal for the intake and the boots are good. I have not rebuilt or cleaned the carbs yet. To my knowledge and from what I have been told everything with the carbs and exhaust is stock. Nothing is missing from the intake system. The carbs came off a running 1982 GS850G. It was not on the rode but it was running. THanks very much.

          Comment

            #6
            I have adjusted the main idle and that is actually what got me to the place where it is running now. Thanks.

            Comment

              #7
              Rebuild the carbs properly if you care about making the bike reliable.
              Ed

              To measure is to know.

              Mikuni O-ring Kits For Sale...[url]https://www.thegsresources.com/_forum/forum/consumer-information/gs-parts-and-services/1703182-mikuni-bs-cv-and-vm-o-ring-kits#post1703182[/url]

              Top Newbie Mistakes thread...[URL="http://www.thegsresources.com/_forum/showthread.php?t=171846"]http://www.thegsresources.com/_forum...d.php?t=171846[/URL]

              Carb rebuild tutorial...[URL="https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf"]https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf[/URL]

              KZ750E Rebuild Thread...[URL="http://www.thegsresources.com/_forum/showthread.php?217199-1981-Kawasaki-KZ750-Resurrection"]http://www.thegsresources.com/_forum...0-Resurrection[/URL]

              Comment

                #8
                Originally posted by ray illuminati View Post
                I have not adjusted the valves.
                This is high on the list of first things to do to a "new" motorcycle.

                Originally posted by ray illuminati View Post
                I have made sure the seal for the intake and the boots are good.
                Did you just spray something over them or did you replace the o-rings?

                Originally posted by ray illuminati View Post
                I have not rebuilt or cleaned the carbs yet.
                Also very high on the list of things to do.

                Originally posted by ray illuminati View Post
                To my knowledge and from what I have been told everything with the carbs and exhaust is stock.
                Some quick pictures will help confirm that.

                Originally posted by ray illuminati View Post
                Nothing is missing from the intake system.
                Again, pictures would confirm that.

                Originally posted by ray illuminati View Post
                The carbs came off a running 1982 GS850G.
                They have different "choke" activation systems, but the old one can be put on the "new" carbs.
                Still is no guarantee that the carbs are in good shape.

                Originally posted by ray illuminati View Post
                It was not on the rode but it was running.
                In other words, you have no idea how they really work.

                .
                [SIGPIC][/SIGPIC]
                mine: [URL="http://tinyurl.com/btyzw4z"]2000 Honda GoldWing GL1500SE [/URL]and [URL="http://tinyurl.com/o6vqacs"]1980 GS850G'K'[/URL] "Junior"
                hers: [URL="https://tinyurl.com/yaapydtv"]1982 GS850GL[/URL] - [URL="http://tinyurl.com/cospp3s"]"Angel" [/URL]and [URL="http://tinyurl.com/bqnpjx9"]1969 Suzuki T250 Scrambler [/URL]
                #1 son: [URL="http://tinyurl.com/d7c8duu"]1986 Yamaha Venture Royale 1300 [/URL]and [URL="http://tinyurl.com/ou7k3lp"]1982 GS650GL[/URL] "Rat Bagger"
                #2 son: 1[URL="http://tinyurl.com/buxhls6"]980 GS1000G [/URL]
                [URL="http://tinyurl.com/d4ojmal"]Family Portrait [/URL]
                [URL="http://tinyurl.com/cbo3ojk"]Siblings and Spouses[/URL]
                [URL="http://tinyurl.com/ctr8k54"]Mom's first ride[/URL]
                [B]Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM) [/B]
                [SIZE=1](Click on my username in the upper-left corner for e-mail info.)[/SIZE]

                Comment

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