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What is this screw on the petcock? 1980 GS550e

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    What is this screw on the petcock? 1980 GS550e

    I'll try to get a pic posted when I get home, but there is a flathead screw to the right of the RES/ON lever. Is this a flow adjustment screw? I'm trying to figure oit why it's flooding. Have checked float levels and the diaphram is ok in the petcock.

    #2
    The screw should be horizontal, it is your prime, vertically it is open and allows constant fuel flow. Shut it off if it is not.

    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

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      #3
      If that is what has kept me from riding since I got it last summer, I'm gunna b ****ed! Lol. Thanks gustovh.

      Comment


        #4
        The dreaded 1980 petcock!!! The petcocks on these bike is known to fail and the 1980 version is even more mysterious. As stated above, the screw converts from "on" to "prime" as indicated. The prime function is a little strange though since it doesn't flow gas unless there is an initial vacuum applied to the vacuum line. Once the petcock receives vacuum it will continue to flow gas even after the vacuum is removed. In the on position it will stop flowing once it looses the vacuum signal. I wasn't aware that the 550E came with those. I thought the 550L did but the 550E came with a more conventional hand lever petcock.
        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


          #5
          Test your dreaded petcock for correct operation or just get new one from this guy and rule it out as problem
          note centerline spacing of mounting bolts -skip any rebuilding attempts

          1981 gs650L

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

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            #6
            Here is the pic.
            Attached Files

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              #7
              I have another pic but this site isn't real cellphone friendly. I'll see if I can put it on photo bucket and post a link...

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                #8
                Could someone tell me if either of these links work?



                <a href="http://s32.photobucket.com/user/n8_dawg_77/media/Mobile%20Uploads/20150119_161045_zps68e5txtf.jpg.html" target="_blank"><img src="http://i32.photobucket.com/albums/d1/n8_dawg_77/Mobile%20Uploads/20150119_161045_zps68e5txtf.jpg" border="0" alt=" photo 20150119_161045_zps68e5txtf.jpg"/></a>

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                  #9
                  Nevermind. Theres the pic of the screw.

                  Comment


                    #10
                    I see the pics but that is not a GS petcock, so no idear what's going on with that.

                    EDIT 2: Well, I skimmed through the service manual and the petcock in there looks similar but doesn't have that screw. If your bike is a 1980, it might have come with the "dreaded" 1980 petcock from the factory.
                    Last edited by eil; 01-20-2015, 02:37 PM.
                    Charles
                    --
                    1979 Suzuki GS850G

                    Read BassCliff's GSR Greeting and Mega-Welcome!

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                      #11
                      The 550E didn't use the one with the stupid screw. It was the conventional one like the one he posted a picture of. This all assumes that the tank is stock. If it were me and mine looked that bad I would do as Charles said and just replace the entire petcock assembly and be done with it.
                      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


                        #12
                        So ur sayin someone replaced the dreaded petcock with this one that came from who knows where? Lol

                        Comment


                          #13
                          No, just saying that your particular model didn't use the dreaded screw ONLY petcock. The one you showed is a conventional petcock that was used for your model/year. Just get a replacement petcock for your specific model and you should be good to go.
                          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

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