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  • Carburator top hoses go to...?

    I thought I seen this somewhere in the forum but cannot seem to find it now. Could someone point me in the right direction or outright tell me.. The bottom T on the carb feeds the fuel bowls, what does the top t feed or vent??

    Thanks
    "There is a principle which is a bar against all information, which is proof against all arguments and which can not fail to keep a man in everlasting ignorance-that principle is contempt prior to investigation." --HERBERT SPENCER


    Active: 1932 Ford Model A; XS1100SF (Just got 'er); XS1100SG; 2000 F250 Turbo Diesel; 2003 Ford Mustang
    Broken: 1999 Kawi Vulcan 750; 1998 Triumph Trophy 1200
    Gonners: XS1100SF (my first ride); '82 Honda CB900F (bored to 1123cc); '86 Kawasaki ZG1000

  • #2
    Mac, the carburetor vent hoses connect to the two small fittings on the air box; should be one on either side of the breather vent hose.
    -- Scott
    _____

    2004 ST1300A: No name... yet
    1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
    1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
    1979 XS1100SF: "Bush" W.I.P.
    1979 XS1100F: parts
    2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

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    • #3
      Thank You
      "There is a principle which is a bar against all information, which is proof against all arguments and which can not fail to keep a man in everlasting ignorance-that principle is contempt prior to investigation." --HERBERT SPENCER


      Active: 1932 Ford Model A; XS1100SF (Just got 'er); XS1100SG; 2000 F250 Turbo Diesel; 2003 Ford Mustang
      Broken: 1999 Kawi Vulcan 750; 1998 Triumph Trophy 1200
      Gonners: XS1100SF (my first ride); '82 Honda CB900F (bored to 1123cc); '86 Kawasaki ZG1000

      Comment


      • #4
        You're welcome!
        -- Scott
        _____

        2004 ST1300A: No name... yet
        1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
        1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
        1979 XS1100SF: "Bush" W.I.P.
        1979 XS1100F: parts
        2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk" It's DEAD, it's not just resting. It is an EX cycle.

        Comment


        • #5
          vacuum lines questions

          I just switched out my old stock coils for some other stock coils..replaced my fuse box with a Napa blade style box and took out my stock air cleaner box and installed POD type air cleaners for each carb.I installed a POD type filter for the crankcase breather...now what to do with those 2 small vacuum lines at the carbs..?? 79XS1100 standard...bike seems to idle nice,runs smooth..and has a cool growl.but seems a lil less snappy...what are those vacuums lines suppose to be doing?

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          • #6
            Less snappy throttle with the pods is because you don't have the velocity stacks anymore that the factory air box had, JMHO. As for the vent lines, either leave them open or put a small fuel filter on each one to keep dirt, bugs etc from entering. They must be open to atmosphere to prevent flooding of the carbs.
            2H7 (79) owned since '89
            3H3 owned since '06

            "If it ain't broke, modify it"

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            • #7
              Originally posted by bikerphil View Post
              Less snappy throttle with the pods is because you don\'t have the velocity stacks anymore that the factory air box had, JMHO. As for the vent lines, either leave them open or put a small fuel filter on each one to keep dirt, bugs etc from entering. They must be open to atmosphere to prevent flooding of the carbs.
              My question about those little hoses is that in the factory setup there would be a little bit of vacuum being applied to those lines, and then that would create a different atmospheric pressure inside the float bowls.

              Could that then cause changes with the fuel level/ how fuel flows up the jet and into the air stream going through the carbs?
              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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              • #8
                Could, Should, and Would...

                As a matter of pure physics, yes, there is the COULD part of the equation.

                How much vacuum is created, and how much friction is invovled in pulling any amount of air through the path of those lines, to those T's and through the carbs? The difference is the amount of vacuum the float bowls SHOULD see.

                Now, based upon info from many others here who run POD filters and their journey to tuning their carbs I have watch documented on the site, and in person on one or two occasions, I would say there WOULD be no noticable change. I have seen several play around with float levels and typically always come back to factory works best, PODs or not. I know one or two people will say they get much better results with non factory float levels, but the majority work best at factory.

                So like Phil stated, most just tie them up to the frame under the tank, some put a filter on them.

                As to your throttle snappyness, well, most POD owners will tell you they lose a little on the bottom end, but gain it back and then some on the top end. Also, almost all have to rejet for the POD filters to get the best results.
                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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