1981 gs1100E carb vacuum lines

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  • R1reaper
    • Feb 2026

    #1

    1981 gs1100E carb vacuum lines

    Ok I had to completely rebuild my engine. But when I got to me carbs I changed to air pods. Now the question is what do I do with the two large vacuum line that ran to the air box. Do I block them off, run them to somewhere else. Please help
  • Guest

    #2
    I don't think those are vacuum lines but vent lines. You can leave them open to air.

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    • R1reaper

      #3
      ok I wasn't sure what they were I could find anything on them in the manual. Thanks.

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      • rapidray
        Forum Guru
        GSResource Superstar
        • Oct 2006
        • 8195
        • So Cal

        #4
        They ARE vent lines. Point them down or to the rear.
        Ray.

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        • Nessism
          Forum LongTimer
          GSResource Superstar
          Past Site Supporter
          Super Site Supporter
          • Mar 2006
          • 35790
          • Torrance, CA

          #5
          Just in case you didn't know, you will need to rejet the carbs with the installation of those air filters. Dynojet kits have a good reputation with the folks that use them here. Also, there is a big difference in quality between some real K&N pods and the cheap Emgo filters. Big price difference too. Pods from the likes of APE are decent quality but much cheaper than K&N's and a lot of forum members provide positive reviews of them as well.
          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

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          • R1reaper

            #6
            I have the jet kit and I bought the K&N pods. I have the factory air box but the rubbers are bad, and the pods were cheaper than the air box. That is why I went with pods. It already had a four to one exhaust on it. So I figured go the rest of the way. I am making it into a caf? bike. The pods give it a little cleaner look that I like. Thanks guys.

            Comment

            • Guest

              #7
              With the kit do not use the vent hoses.
              The T's open to air is what you want.

              Comment

              • Who Dat?
                Forum Mentor
                • Jun 2012
                • 461
                • On the edge.

                #8
                Originally posted by R1reaper
                Now the question is what do I do with the two large vacuum line that ran to the air box.
                Any GS I have ever seen only has ONE line connected to the air box, and it is a crankcase ventilation line. It collects the vapors that are created by blow-by in the cylinders and allows the carbs to pull it through to be burned.

                OK, some bikes have had a drain line connected to the bottom-left corner of the airbox, but that one should be rather obvious, as it is not connected to the engine.
                If you're not living on the edge, you're taking up too much space.

                Comment

                • Guest

                  #9
                  The vent hoses from BS carbs typically run back over the airbox. They don't vent into it, but are occasionally attached to it {or an adjacent frame tube) with some sort of clip, just or the sake of tidiness.

                  Basscliff's site explains it well: http://members.dslextreme.com/users/...locations.html

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