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Just rebiult the carbs

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    #1

    Just rebiult the carbs

    1985 GS550L 2 Mikuni carbs
    Just rebuilt the carbs
    Only way the bike will stay running is with the choke on all the way??/?/
    Help greatly appreciated
    Thanks in advance
    Tags: None
    #2
    How did you rebuild them? Were they dipped in Berryman's for at least 24 hours each? Did you use new orings?
    Cowboy Up or Quit. - Run Free Lou and Rest in Peace

    1981 GS550T - My First
    1981 GS550L - My Eldest Daughter's - Now Sold
    2007 GSF1250SA Bandit - My touring bike

    Sit tall in the saddle Hold your head up high
    Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
    and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

    Comment

      #3
      Yes and Yes

      Comment

        #4
        Those siamese carbs are VERY sensitive to the amount of intake air they require to run correctly.

        Tons-o-fun getting them back on the bike with the airbox!

        Best to use a brand new OEM air filer in the stock airbox.

        The bike will not run without the "sealed" airbox on.

        Also, how many turns did you set the mixture screws to?
        '85 GS550L - SOLD
        '85 GS550E - SOLD
        '82 GS650GL - SOLD
        '81 GS750L - SOLD
        '82 GS850GL - trusty steed
        '80 GS1100L - son's project bike
        '82 GS1100G - SOLD
        '81 GS1100E - Big Red (daily rider)

        Comment

          #5
          2-1/2 turns out

          Comment

            #6
            Originally posted by GARYEIN1 View Post
            2-1/2 turns out
            Try 3-1/2 turns out - seems I remember those carbs like that better to start with.

            Almost all the issues I ever had with those carbs were related to air intake. They simply will not run right unless using a well sealed airbox with OEM airfilter. Something about the air restriction that is set up that way.

            New intake boot o-rings too?
            '85 GS550L - SOLD
            '85 GS550E - SOLD
            '82 GS650GL - SOLD
            '81 GS750L - SOLD
            '82 GS850GL - trusty steed
            '80 GS1100L - son's project bike
            '82 GS1100G - SOLD
            '81 GS1100E - Big Red (daily rider)

            Comment

              #7
              No, They were tight and not leaking I checked not long ago

              Comment

                #8
                Unless they've been changed out in the past, those 30 yr old o-rings are hard as a rock & not sealing... best to replace them.

                Assuming you did a proper carb dis-assemble, dip & reassemble and a valve adjustment.

                The fact you need choke to keep it running means there's extra air coming from somewhere.

                Any mods like Pods & a pipe? Electrical in good shape? Stock coils & wires?

                I can say that of all the GS models I have tinkered on, my '85 GS550L was by far the hardest to get running right. Bumping up the mains one size & raising the needles a bit (.010" - .020" IIRC) helped.

                Good luck.

                Any pics of her?
                '85 GS550L - SOLD
                '85 GS550E - SOLD
                '82 GS650GL - SOLD
                '81 GS750L - SOLD
                '82 GS850GL - trusty steed
                '80 GS1100L - son's project bike
                '82 GS1100G - SOLD
                '81 GS1100E - Big Red (daily rider)

                Comment

                  #9
                  Listen to Mike. He's da MAN. No substitute for personal experience.
                  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

                    #10
                    The bike only has 14,500 original miles
                    It is all stock
                    We put new pilot jets in it old one got messed up when we took them out, got what should be factory stock replacement, mains are the ones that came in the carbs

                    Comment

                      #11
                      Originally posted by Nessism View Post
                      Listen to Mike. He's da MAN. No substitute for personal experience.
                      Ha, thanks Ed - quite a compliment coming from you !

                      Yeah, my son's '85 550L was my first venture into the GS world... I learned a crap load about that bike, thanks to guys like you & the rest of the experts on here.

                      That particular bike was set-up & jetted super lean from the factory, and its sensitivity to air leaks makes it a bear to get running well.
                      Last edited by hikermikem; 05-04-2014, 02:48 PM.
                      '85 GS550L - SOLD
                      '85 GS550E - SOLD
                      '82 GS650GL - SOLD
                      '81 GS750L - SOLD
                      '82 GS850GL - trusty steed
                      '80 GS1100L - son's project bike
                      '82 GS1100G - SOLD
                      '81 GS1100E - Big Red (daily rider)

                      Comment

                        #12
                        OK Thanks
                        I will let you know what happens and what I find out

                        Comment

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