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1977-79 GS750 battery breather tube and airbox drain tube routing

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    1977-79 GS750 battery breather tube and airbox drain tube routing

    Hey guys,

    I'm putting the finishing touches on my bike to make it as complete and as close to original as possible. My bike hasn't run a breather tube for the battery or drain tube for the airbox in quite some time. I found a reference to the airbox drain tube in the factory service manual but the poor quality B&W photo doesnt seem to make things any clearer. I noticed there is a small "retainer" in the area of the left footpeg (right behind the rear bolt for the footpeg) and it looks like maybe the airbox drain tube might go through there. Can anyone confirm this? I'm also having trouble with figuring out the factory routing for the battery breather tube. The portion of the tubing that goes through the battery cage is clear to me but after that, I'm lost. I did see this decal that supposedly came with GS750s but it doesn't seem to be of much help either as there isn't anything on the frame or the engine to retain the end of the battery breather tube.

    s-l400.jpg
    1978 Suzuki GS750

    Past bikes owned:
    1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

    #2
    Here's a picture of the retainer for what I suspect is the airbox drain tube. I saw on one of the Suzuki GS facebook groups that somebody else was puzzling the purpose of this retainer. some folks were speculating that it was for the rubber bumper that the end of the sidestand bumps into. seems like these bikes with the stock exhaust had the side stand bumper on the left muffler itself so a retainer seems to be the most plausible purpose of it. Anybody know the factory routing from the airbox to the retainer?

    164847127_349293863128561_6854774626854465810_n.jpg
    1978 Suzuki GS750

    Past bikes owned:
    1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

    Comment


      #3
      Get a sealed AGM battery and then you won’t have to worry about that tube. I’m not sure on the air box drain tube. What you say sounds right. As long as you route it so it can’t bind up, and can drain off- center, below the engine, so any dripping isn’t directly in front of the rear tire, but off to the side. My air box drain tube has a cap on it. If you continue with the regular battery, there’s maybe a squarish chase molded into the rear or the engine case on the right side, run that tube through there so it drain to ground, again, off-center. I once had that end of the battery drain tube end up resting on the exhaust somehow. The heat melted the tube and cauterized it. Oops.
      Rich
      1982 GS 750TZ
      2015 Triumph Tiger 1200

      BikeCliff's / Charging System Sorted / Posting Pics
      Destroy-Rebuild 750T/ Destroy-Rebuild part deux

      Comment


        #4
        Originally posted by Rich82GS750TZ View Post
        Get a sealed AGM battery and then you won’t have to worry about that tube. I’m not sure on the air box drain tube. What you say sounds right. As long as you route it so it can’t bind up, and can drain off- center, below the engine, so any dripping isn’t directly in front of the rear tire, but off to the side. My air box drain tube has a cap on it. If you continue with the regular battery, there’s maybe a squarish chase molded into the rear or the engine case on the right side, run that tube through there so it drain to ground, again, off-center. I once had that end of the battery drain tube end up resting on the exhaust somehow. The heat melted the tube and cauterized it. Oops.
        I’ll have to do some research on AGMs. I’ve never had any problems with the conventional lead acid batteries so I never gave it much thought. Thank you!
        1978 Suzuki GS750

        Past bikes owned:
        1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

        Comment


          #5
          One of the better brands out there is the Motobatt; great battery and really good customer service
          sigpic
          Cowboy Up or Quit. - Run Free Lou and Rest in Peace

          1981 GS550T - My First
          1981 GS550L - My Eldest Daughter's
          2007 GSF1250SA Bandit - My touring bike

          Sit tall in the saddle Hold your head up high
          Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
          and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

          Comment


            #6
            but it doesn't seem to be of much help either as there isn't anything on the frame or the engine to retain the end of the battery breather tube.
            You could just use a pull-tie or a piece of twisted wire and put the tube anywhere you want...?

            Danger! Argumentative Opinion Follows: AGM's are ok I guess but the last new battery I chose to buy was a nice Yuasa wet cell ....

            Comment


              #7
              Originally posted by Gorminrider View Post
              You could just use a pull-tie or a piece of twisted wire and put the tube anywhere you want...?

              Danger! Argumentative Opinion Follows: AGM's are ok I guess but the last new battery I chose to buy was a nice Yuasa wet cell ....
              I actually found the little tab meant for the end of the battery tube. I had to run my finger underneath the frame to find it but it’s there. I’ll probably get a new drain tube next time I’m out.
              1978 Suzuki GS750

              Past bikes owned:
              1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

              Comment

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