Announcement

Collapse
No announcement yet.

How to avoid breaking fuel screw tips when setting fuel screws to 1 turn out?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    How to avoid breaking fuel screw tips when setting fuel screws to 1 turn out?

    Whilst the answer I guess is obvious....be extraordinarily careful. Seriously is there a trick to employ to avoid breaking these needle tips off in the carb bodies. Seems like it's nearly impossible to bottom down the screws so you can then unwind the required 1 rotation without breaking them. How do you guys set the screws?

    #2
    Just... be gentle?

    And make sure they're not bent, and make sure the threads are clean, clean, clean.

    I run them in before assembling the rack, and without the spring and o-ring, to make sure the tip lines up perfectly with the tiny hole and that the threads are clean. I suppose this will also help educate your fingers (two fingers, never more) as to the correct feel, and the acceptable amount of force.

    The threads and o-ring get a drop of motor oil upon assembly.
    1983 GS850G, Cosmos Blue.
    2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
    2015 Yamaha FJ-09, Magma Red Power Corrupts...
    Eat more venison.

    Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

    Celeriter equita, converteque saepe.

    SUPPORT THIS SITE! DONATE TODAY!

    Co-host of "The Riding Obsession" sport-touring motorcycling podcast at tro.bike!

    Comment


      #3
      I take an old one, remove the tip and screw it in to clean the threads... after a couple broken tips and junk carbs, it's obvious why I do this
      Current:
      1993 ZX11 - 2nd build in progress
      1977 GS750 (710 is getting closer)
      1998 Kawasaki Voyager - selling
      1998 Chevy C2500
      1999 Rav4

      Comment


        #4
        Originally posted by unfocused View Post
        I take an old one, remove the tip and screw it in to clean the threads... after a couple broken tips and junk carbs, it's obvious why I do this
        This is a good idea. I have a tap, but I don't like using it because it removes too much material. An old screw is a better idea.
        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

          This is a good idea. I have a tap, but I don't like using it because it removes too much material. An old screw is a better idea.
          A thread chaser is used for cleaning threads, a tap is used for 'making threads'

          I learned this the hard way.
          Current:
          1993 ZX11 - 2nd build in progress
          1977 GS750 (710 is getting closer)
          1998 Kawasaki Voyager - selling
          1998 Chevy C2500
          1999 Rav4

          Comment


            #6
            Originally posted by unfocused View Post

            A thread chaser is used for cleaning threads, a tap is used for 'making threads'

            I learned this the hard way.
            Yes, of course. If you find a chaser in the proper thread size for these screws, please provide a link...
            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


              #7
              Originally posted by Nessism View Post

              Yes, of course. If you find a chaser in the proper thread size for these screws, please provide a link...
              I know, right.

              I didn't have enough characters so here is more and a
              Current:
              1993 ZX11 - 2nd build in progress
              1977 GS750 (710 is getting closer)
              1998 Kawasaki Voyager - selling
              1998 Chevy C2500
              1999 Rav4

              Comment


                #8
                Originally posted by Samxboy View Post
                Seems like it's nearly impossible to bottom down the screws so you can then unwind the required 1 rotation without breaking them.
                All the above advice is helpful. I'm not sure what you mean by "the required 1 rotation". Depending on intake mods, once fine-tuned, the pilot fuel screws are commonly at 1/2 to 2 turns out from lightly seated and the best position often varies from cylinder to cylinder because of small differences between cylinders.

                And on the seventh day,after resting from all that he had done,God went for a ride on his GS!
                Upon seeing that it was good, he went out again on his ZX14! But just a little bit faster!

                Comment


                  #9
                  Use a tiny screw driver and turn it with 2 fingers only, no wrist motion. When it stops turning, stop.

                  Pretent you're a posh Brit drinking from a baby doll tea cup that's too small for your fingers, so you pinch it between pointer and thumb with the remaining fingers pointed out. That's the best description I can come up with.
                  - 1983 GS850L ~ 30,000 miles and going up - Finally ready for a proper road trip!
                  - 1977 GS750B - Sold but not forgotten

                  Comment


                    #10
                    Originally posted by 93Bandit View Post
                    Use a tiny screw driver and turn it with 2 fingers only, no wrist motion. When it stops turning, stop.

                    Pretent you're a posh Brit drinking from a baby doll tea cup that's too small for your fingers, so you pinch it between pointer and thumb with the remaining fingers pointed out. That's the best description I can come up with.
                    *THIS*

                    You have to be as delicate as that tip is.

                    If it helps, this is what it looks like inside.

                    Centurion 1.jpg
                    Last edited by Cha5; 01-06-2024, 12:25 PM.

                    Comment


                      #11
                      I just finished rebuilding a set of VM26's for a customer. All the threads were tight in this rack of carbs, so I took a previously broken tip fuel screw, and ran it down in and out a couple of times, though each carb. In the end, when installing the proper fuel screws, with the sharp tip, they screwed in quite nicely. Special thanks to unfocused for this suggestion!
                      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

                      Working...
                      X