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Removing old stuck air mixture screws

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  • Removing old stuck air mixture screws

    I'm doing a resto on an old non road star bike with Mikuni carbs. 40 year old bike and I need to replace the air mixture screws. The old ones are stuck pretty tight. 1 came out and three others not budging. Now they have stripped heads ( they are steel not brass). I have tried everything (PB blaster, heat, etc). Anybody got any udeas? Had to use a #1 Irwin screw out for the pilot jets and am going to try that with these buy wanted to see if anybody had other suggests.
    Go ahead, I dare ya.

  • #2
    Got pics???

    Comment


    • #3
      OK here you go Dave.b
      Go ahead, I dare ya.

      Comment


      • #4
        And there's this. Started with the usual things then moved on to the Irwin bolt outs ( #1 then moved on to #2) which resulted in this fiasco.
        Attached Files
        Go ahead, I dare ya.

        Comment


        • #5
          Put the entire carb in a sonic cleaner. Would that work?

          Comment


          • #6
            Originally posted by Shores View Post
            Put the entire carb in a sonic cleaner. Would that work?
            I don't have one but I could try that. It is a set of 4 from an old Suzuki that I had full disassembled and each one was soaked in Berrymans Chem dip after disassembly. I pulled the factory plugs after everything else was reassembled. At this point the slots are just enough rounded on the edges that it you can't get enough grip. To put them in a sonic cleaner would I have to completely disassemble again (remove all the new gasket rings ect) or just pull the needle jets slides to protect the rubber bladders?
            Go ahead, I dare ya.

            Comment


            • Shores
              Shores commented
              Editing a comment
              I’m not familiar with sonic cleaners other than they dislodge a lot of crud and make things real clean.

          • #7
            To remove these stuck screws you will need to drill a perfectly straight and perfectly centered hole completely through the threads. This is best accomplished on a mill but you can do it by hand if you are careful and patient. A transfer punch would be a simple way to center punch the head. If you don.t have one use a drill bit the same size as the hole and drill a shallow dimple in the head of the screw to indicate the center. Center punch the dimple. Drill the head all the way through using a small (1/64") drill bit as a pilot hole. This is best done on a drill press to ensure a straight hole but can be done by hand with care and patience. Measure the outside diameter of the new threads and choose a drill bit slightly smaller and drill all the way through again. Now your easy out should be able to easily remove the frozen part. If not, it will be necessary to drill through with a bit that is just a few thousandths smaller than the threads and use a pick to remove the threads.

            Comment


            • #8
              You did say that you tried everything did you try light tapping and he and Phoebe blaster. I don't imagine it'll work at three of them are stuck but sometimes a light tapping will loosen stuff in the threads. You have to be over so careful about what those old carburetors

              Comment


              • #9
                Originally posted by Chooch View Post
                To remove these stuck screws you will need to drill a perfectly straight and perfectly centered hole completely through the threads. This is best accomplished on a mill but you can do it by hand if you are careful and patient. A transfer punch would be a simple way to center punch the head. If you don.t have one use a drill bit the same size as the hole and drill a shallow dimple in the head of the screw to indicate the center. Center punch the dimple. Drill the head all the way through using a small (1/64") drill bit as a pilot hole. This is best done on a drill press to ensure a straight hole but can be done by hand with care and patience. Measure the outside diameter of the new threads and choose a drill bit slightly smaller and drill all the way through again. Now your easy out should be able to easily remove the frozen part. If not, it will be necessary to drill through with a bit that is just a few thousandths smaller than the threads and use a pick to remove the threads.
                That is a great suggestion and that is the kind of thing I would not be afraid to do if I had a drill press still and could machine the part accurately. Unfortunately I don't have one anymore to get that kind of precision. I have tried all the stuff that you guys have suggested and so I am gonna have to throw in the towel myself and take it to a local guy here who is really good at this stuff to give it a try. I will keep you posted on the outcome.
                Go ahead, I dare ya.

                Comment

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