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    Air screw screwed

    In chasing down these idling and performance issues with my GS750, I remembered that the air screw for the #3 carb was boogered up by a previous owner. I tired again to remove it but it's stripped beyond useful. I was able to turn it in however and noticed that it was pretty much already turned in all the way . I'm assuming this would cause the carb to load up on fuel? All of the floats and needles move freely. This is the only thing I can think of that is causing all this trouble. Aside from them needing to be synced. Can't do that until I either get this screw out or replace that carb.
    Attached Files
    Current Bikes:

    2019 Indian Chieftain Classic
    1981 Suzuki GS750E

    Past Bikes:

    2018 Indian Chief Dark Horse
    2017 Indian Scout
    2006 Suzuki C50

    #2
    A thin dremel cut off disc can be used to cut down into the tower and create a new slot in the screw. After a slot is created grind an old screwdriver until it's a super tight fit into the slot. Use lots of PB Blaster or similar and heat the carb with a torch. Turn the screw back and forth to allow the penetrating oil to reach all the threads. Eventually you should be able to get the screw to fully back out.
    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


      #3
      Just so you know for sure, those are NOT "air screws". They actually control a fuel/air mixture, and screwing them IN will make the overall mixture LEANER, not richer. So, if you are having rich-running problems, it's not because of that screw being turned in.

      Nessism described the procedure, here is what it looks like.



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      Comment


        #4
        One other option is to simply drill out the old broken screw. It's fiddly work so I don't advise it unless you are experienced in such tasks. I've done it before on some carbs I didn't want to cut into with the dermel and it worked fine. Biggest problem was getting out the thinner section of the screw once the head was drilled out.
        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


          #5
          Originally posted by Nessism View Post
          One other option is to simply drill out the old broken screw. It's fiddly work so I don't advise it unless you are experienced in such tasks. I've done it before on some carbs I didn't want to cut into with the dermel and it worked fine. Biggest problem was getting out the thinner section of the screw once the head was drilled out.
          sounds like you had to use a drill press right in order to keep it straight and not booger up the threads?

          im thinking i may cut into mine first, if that doesn't work i'll drill em out.

          What a nightmare mine are worse than in the picture. As the saying goes: whoever did this should be shot
          Originally posted by tkent02
          That's not a tree, that's a shrubbery. Now get to work on that old dirt bike
          John 3:16

          Comment


            #6
            Just in case you don't know know, when drilling anything out, find & use a left hand drill bit. Hopefully you won't need to drill
            1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

            Comment


              #7
              Originally posted by rphillips View Post
              Just in case you don't know know, when drilling anything out, find & use a left hand drill bit. Hopefully you won't need to drill
              I gotcha actually a good idea so it doesn't go further in right?
              Originally posted by tkent02
              That's not a tree, that's a shrubbery. Now get to work on that old dirt bike
              John 3:16

              Comment


                #8
                Originally posted by GabrielGoes View Post
                I gotcha actually a good idea so it doesn't go further in right?
                No…with any luck and care, the left hand bit will bite into screw head and grab screw and back it out for you. Don’t be tempted to use screw extractor….they’re very brittle and easy to break. Since most home drill presses don’t reverse direction, you’ll probably have to use a hand held drill.
                1981 gs650L

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

                Comment


                  #9
                  "That's not a shrubbery, that's a tree... It just ain't had a chance to grow up yet". Now get back to work on that carb. & yep, what he said, "sometimes" the left hand drill will actually hang & back the thing out for you, the right handed will never do that.
                  1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

                  Comment


                    #10
                    Originally posted by tom203 View Post
                    No…with any luck and care, the left hand bit will bite into screw head and grab screw and back it out for you. Don’t be tempted to use screw extractor….they’re very brittle and easy to break. Since most home drill presses don’t reverse direction, you’ll probably have to use a hand held drill.
                    This is a good way, I would also warm up the body of carb in the screw area
                    sigpic

                    Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

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