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  • #1

    pilot screw broken

    Good Evening.

    I sure had my stupid pills this morning. tearing down carbs for cleaning. #1 carb pilot screw. Tighted it to see how many turns it was out. Went too far and the tip broke off. Any else ever have this issue? What is the best remedy to fix it? I tried to take needle nose pliers and push it back out...no dice. The copper smashed down. So then I took a small file and filed it off flush with the inside surface of the carb, thinking I might be able to push or punch it out. Then I thought someone on here might be able to help.... before I screw things up any worse.

    Was thinking it could be drilled out??? I know that would be pretty dangerous, since I don't know what size that hole is supposed to be, or if I could even get a bit that small to begin with.

    Any ideas.
    Thanks
    Theron
    Yamaniac
    '79 xs11 sf - WidowMaker, 750 final drive
    '80 xs1100 sg- ENEMY#1 parts bike no title(free)
    '79 f- frame and swingarm (and title)
    '82 yz 490- needs a cylinder, head, & new piston, etc. Got one for sale?
    '88 Honda cbr600- Running, finally! Training bike for swmbo, maybe a stunt bike for me eventually.
    Tags: None
  • #2
    Amazing what you can find in the tech tips:
    Push Pin pilot screw tip removal tip

    T.C.
    T. C. Gresham
    81SH "Godzilla" . . .1179cc super-rat.
    79SF "The Teacher" . . .basket case!
    History shows again and again,
    How nature points out the folly of men!

    Comment

    • #3
      Thanks T.C.

      Whats more amazing is that I bet I have read through tech tips a 100 times and don't ever remember seeing that.

      THe pick trick didn't work, so I guess I'll go for the push pin and see what that gets me.

      appreciate it.
      Theron
      Yamaniac
      '79 xs11 sf - WidowMaker, 750 final drive
      '80 xs1100 sg- ENEMY#1 parts bike no title(free)
      '79 f- frame and swingarm (and title)
      '82 yz 490- needs a cylinder, head, & new piston, etc. Got one for sale?
      '88 Honda cbr600- Running, finally! Training bike for swmbo, maybe a stunt bike for me eventually.

      Comment

      • #4
        If all else fails, you can go to any hardware store and buy a Pin Vise, and a #60 drill bit and drill it out by hand. I have had some success following the tech tips here, but the last set of carbs had a broken pilot screw also. You could try to heat the area around the screw tip with a heat gun, hair drier or a propane torch, if all the fuel is drained and the fumes dissapated. The hand drilling will take time, so be patient. It worked for me.

        Comment

        • #5
          success

          after about 10 push pins, i got it out. They kept bending on me until I got the right angle.

          Thanks!
          Theron
          Yamaniac
          '79 xs11 sf - WidowMaker, 750 final drive
          '80 xs1100 sg- ENEMY#1 parts bike no title(free)
          '79 f- frame and swingarm (and title)
          '82 yz 490- needs a cylinder, head, & new piston, etc. Got one for sale?
          '88 Honda cbr600- Running, finally! Training bike for swmbo, maybe a stunt bike for me eventually.

          Comment

          • #6
            where to get a new one?

            It looks like these might be availabe from Yamaha. None of the ones on MikeXS look like the same screw.

            Where have others got a replacement pilot screw?

            Thanks
            Theron
            Yamaniac
            '79 xs11 sf - WidowMaker, 750 final drive
            '80 xs1100 sg- ENEMY#1 parts bike no title(free)
            '79 f- frame and swingarm (and title)
            '82 yz 490- needs a cylinder, head, & new piston, etc. Got one for sale?
            '88 Honda cbr600- Running, finally! Training bike for swmbo, maybe a stunt bike for me eventually.

            Comment

            • #7
              I bought mine at motorcyclecarbs.com. Can't remember what I paid for 'em, though...

              Comment

              • #8
                You can machine a new point for the broken screw in a drill press. Grip the screw by its head, spin it at a fairly fast speed, and machine a new point by carefully rubbing a file and/or sandpaper against it. Have a good screw on hand to help you get the desired taper, and be careful not to take off too much at a time.
                Ken Talbot

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