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  • #1

    Need new carbs??

    i bought my bike last year and have done a lot of work to it but I can't get the carbs set right. When I got the bike all 4 pilot screws were broke off and being new to this, I listened to a guy and just drill them out. Now the holes are too big. I think they got drilled out to 1/16". I've messed with them a lot since then trying to get them set but no matter what I do all you smell is gas when its running. I'm pretty sure I ruined them. Now i'm just looking for a good set of used carbs I can rebuild the right way without spending $500. I cant seem to find any anywhere. Do you guys think I can reuse these or if not where I can get a used set? Whatever help would be appreciated. Thanks.
    79 SF
    Tags: None
  • #2
    Do the screws still bottom out, seal off? Of course, go very lightly when seating them so as not to get them stuck again. But they will probably be more finicky than the stock hole size to get set correctly, much less movement to get the same result.
    Life is what happens while your planning everything else!

    When your work speaks for itself, don't interrupt.

    81 XS1100 Special - Humpty Dumpty
    80 XS1100 Special - Project Resurrection


    Previously owned
    93 GSX600F
    80 XS1100 Special - Ruby
    81 XS1100 Special
    81 CB750 C
    80 CB750 C
    78 XS750

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    • #3
      I wish people would tell folks HOW to drill out the pilot screws PROPERLY..

      I used a 1/16 bit with masking tape wrapped around the edge. Leaving the tip exposed about 1/8 inch.

      What you are actually doing is NOT drilling out the tiny hole..

      You are simply removing small amounts of the broken needle tip from the inside, THEN trying to force it out with a pushpin from the air side.

      Repeat in SMALL steps until you remove just enough material in the inside to pop out the broken needle.

      I also drilled my #4 carb completely through as that's what I thought people meant. When my #2 snapped, I did the new way. I still have a factory air-hole in #2. My pooched #4 requires a "special" mixture screw with a very short spring and a large rounded tip.

      Sorry about your carbs. Depending on how big the holes are, maybe you can ask others for THEIR broken mixture screws and use short springs like I did. It does make tuning a bit funky, BUT it does work.

      At least till I win the lottery and can afford new carbys.
      1) Fire up Internet Explorer
      2) http://www.yahoo.com
      3) type "www.mapquest.com" into the Yahoo search page.
      4) go about day as VP managing multi-million dollar financial contracts.

      Comment

      • #4
        Originally posted by Diskman01 View Post
        requires a "special" mixture screw with a very short spring and a large rounded tip.
        +1, I just shortened my springs and let the tips protrude further down into the carb throat, you may need to grind the tip some as needed. It helps if you have a colortune plug to see what is actually going on with the combustion color. Clark, are you sure you have the correct pilot jets with 6 air bleed holes in the sides? There are others that fit but will produce an overly rich mixture as you are describing, JAT.
        2H7 (79) owned since '89
        3H3 owned since '06

        "If it ain't broke, modify it"

        ☮

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        • #5
          Originally posted by DGXSER View Post
          Do the screws still bottom out, seal off? Of course, go very lightly when seating them so as not to get them stuck again. But they will probably be more finicky than the stock hole size to get set correctly, much less movement to get the same result.
          I dont think i can seat them. I think the sping compresses before they seat properly
          79 SF

          Comment

          • #6
            Originally posted by Diskman01 View Post
            I wish people would tell folks HOW to drill out the pilot screws PROPERLY..

            I used a 1/16 bit with masking tape wrapped around the edge. Leaving the tip exposed about 1/8 inch.

            What you are actually doing is NOT drilling out the tiny hole..

            You are simply removing small amounts of the broken needle tip from the inside, THEN trying to force it out with a pushpin from the air side.

            Repeat in SMALL steps until you remove just enough material in the inside to pop out the broken needle.

            I also drilled my #4 carb completely through as that's what I thought people meant. When my #2 snapped, I did the new way. I still have a factory air-hole in #2. My pooched #4 requires a "special" mixture screw with a very short spring and a large rounded tip.

            Sorry about your carbs. Depending on how big the holes are, maybe you can ask others for THEIR broken mixture screws and use short springs like I did. It does make tuning a bit funky, BUT it does work.

            At least till I win the lottery and can afford new carbys.

            Too bad i didn't know how to properly remove them then. The guy told me to drill all the way through so thats what i did. Could i just cut some off the orignal spring or i do i need to get another spring?
            79 SF

            Comment

            • #7
              Originally posted by bikerphil View Post
              +1, I just shortened my springs and let the tips protrude further down into the carb throat, you may need to grind the tip some as needed. It helps if you have a colortune plug to see what is actually going on with the combustion color. Clark, are you sure you have the correct pilot jets with 6 air bleed holes in the sides? There are others that fit but will produce an overly rich mixture as you are describing, JAT.
              I'm not sure what they are. I bought the bike and the previous owner said it was all orginal. He was going to restore it but lost intrest. I can get it to idle but it idles high. When i ride with my buddys they say they can smell gas bad behind me. It has the 4 into 1 exhaust and i took the baffle out and put a k & N filter in it. It doesn't run any better with the baffle in. I had it synced the best i could with the gauges and at WOT (about 6000RPM's it sputters perty bad). It also doesn't have the octopus on it anymore. The fuel lines run straight to the carbs. I want to get a set of 2 into 1's for it because the 4 into 1 hangs too low i think but i need to figure out this carb situation first.
              79 SF

              Comment

              • #8
                Tuning the carbs and then changing exhaust is doubling up on your work. You will need to retune and possibly...maybe..rejet for the 4-2 instead of 4-1 change. Especially if the 4-2 has decent baffling and your 4-1 does not as you indicated.

                I would recommend adding in line fuel filters. A lot of folks run without the OCTY valve.

                Generally speaking, these engines like/need some back pressure in the exhaust. So the alck of any baffling will make it a b!tch to tune.
                Life is what happens while your planning everything else!

                When your work speaks for itself, don't interrupt.

                81 XS1100 Special - Humpty Dumpty
                80 XS1100 Special - Project Resurrection


                Previously owned
                93 GSX600F
                80 XS1100 Special - Ruby
                81 XS1100 Special
                81 CB750 C
                80 CB750 C
                78 XS750

                Comment

                • #9
                  For a permanent fix, you could drill them out slightly larger with a drill press to ensure the holes are straight. Then find a small jet with the same size head as the hole, cut the threads off the jet, and press it in. It's only a piece of metal.
                  "The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.

                  Pics: http://s1236.photobucket.com/user/ya...?sort=6&page=1

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                  • #10
                    I have an '80 set of good carbs, but not sure if you can rejet them for the '79, maybe someone has experience in this...Later 'Dog

                    Comment

                    • #11
                      Originally posted by scalded dog View Post
                      I have an '80 set of good carbs, but not sure if you can rejet them for the '79, maybe someone has experience in this...Later 'Dog
                      Carbs are jetted according to the year of the carbs, not the year of the bike.
                      Nathan
                      KD9ARL

                      μολὼν λαβέ

                      1978 XS1100E
                      K&N Filter
                      #45 pilot Jet, #137.5 Main Jet
                      OEM Exhaust
                      ATK Fork Brace
                      LED Dash lights
                      Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                      Green Monster Coils
                      SS Brake Lines
                      Vision 550 Auto Tensioner

                      In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                      Theodore Roosevelt

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                      • #12
                        Originally posted by scalded dog View Post
                        I have an '80 set of good carbs, but not sure if you can rejet them for the '79, maybe someone has experience in this...Later 'Dog
                        If i cant get mine to work i will be needing some if you'd be willing to sell. What would you have to have out of them and what would it cost to ship them to zip code 50220?
                        79 SF

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                        • #13
                          They are off a running bike, cleaned real well when I was trying to get this '80 special running right, but motor is toast, so am parting out, will take $125., plus shipping, will check shipping prices if you want to buy, the carbs...Later 'Dog

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                          • #14
                            Originally posted by cclark1788 View Post
                            I dont think i can seat them. I think the sping compresses before they seat properly
                            Hi Cody,
                            I drilled out one of 3 carbs on an XS750 with a 1/16" drill bit because my drill chuck wouldn't grip the correct (1mm) size and it ran kinda OK after.
                            Try grinding the springs shorter. It's easy to do, it might even work and it's a zero-cost option.
                            Or make a deal with scalded dog, the '80 carb rack will drop straight on.
                            Fred Hill, S'toon
                            XS11SG with Spirit of America sidecar
                            "The Flying Pumpkin"

                            Comment

                            • #15
                              I wasn't talking about re-jetting. I just meant that you could re-drill, and press a jet into the pilot hole to recreate the small hole that was drilled out. Then you pilot needle would have a better seat. FYI
                              "The Hooligan" XJ1100, Virago Gauge Pods, Screaming Eagle Mufflers, K&N Filter, hand made rear fender, side covers, and solo seat, round bar conversion, small headlight, tail light, and cat eye turn signals, chip fuses, rewired the right way.

                              Pics: http://s1236.photobucket.com/user/ya...?sort=6&page=1

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