Tach cable weeping oil

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  • LarryJ
    • Feb 2026

    #1

    Tach cable weeping oil

    Got the '82 GK running pretty well. Still working on the paint & aesthetics of the bike. However, I have been seeing oil weeping out of the tach cable about an inch or so from the head.

    Is that a bad tach drive seal, or just some residual oil from when this bike spewed oil from it's pores & a very bad cam cover gasket?!

    I'd expect a bad tach drive seal to leak more & to show right where the cable screws to it.
  • Agemax
    Forum Guru
    • Apr 2008
    • 8371
    • plymouth uk

    #2
    probably the seal gone and running down the cable a bit before it drips.
    disconnect the cable from the head, give it all a good clean up around the tach drive and then start the bike up. you will see where the leak is coming from
    1978 GS1085.

    Just remember, an opinion without 3.14 is just an onion!

    Comment

    • tatu
      Forum Sage
      Past Site Supporter
      • Jun 2010
      • 3175
      • UK

      #3
      Could also be where the seal runs on the tacho drive it's pitted, if so you can whip it out and spin it up on a drill and clean it up with some emry.
      sigpic

      Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

      Comment

      • Tim Tom

        #4
        Or it could be the oil is leaking at the crimp connection where the cable meets the cable end. In which case you'd have to replace the cable.

        Comment

        • 1980GS1000E
          Forum Sage
          Past Site Supporter
          • Aug 2007
          • 1664
          • San Diego, California, USA

          #5
          It's a known issue. The seals are sold as a replacement part. Make sure to examine the gear and make sure it's not pitted where it contacts the seal.

          Current Rides: 1980 Suzuki GS1000ET, 2006 H-D Fatboy, 2021 BMW K1600B

          Comment

          • Guest

            #6
            There's a few oil seals in the tach cable attachment to the engine.
            Very confusing fiche though.
            Items 22 & 23 are seals,
            20 & 21, although they look different like different driven gears they still have the same part number, I guess I would have to have that particular bike to discern what I got and what I need.
            http://www.boulevardsuzuki.com/fiche...1982&fveh=2158

            Comment

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

              #7
              There are two types of gear housings but both use the same seals. Order 22 & 23 and you are good to go.
              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

              • LarryJ

                #8
                Thanks guys! Good guidance (again)

                Comment

                • Guest

                  #9
                  there's a writeup on it on cliffs site....

                  Comment

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