1977 GS Petcock repair kit

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  • Catcalledsprocket
    • Feb 2026
    #1

    1977 GS Petcock repair kit

    Hi people,
    Well today I successfully rebuilt my petcock using a kit,not without some dramas. After doing some research I found Matchless's tiutoral on bike cliff and this youtube vid
    https://www.youtube.com/watch?v=bwpwhXXF9EQ very helpfull so thanks fella's. Now the problem I struck after the rebuild is that it still leaked fuel on res and on, so after studying the heck out of it and putting it together and taking it apart about 10 times I concluded that it had to be the o-ring on the diaphram piston. So I went to my local auto part store and got a slightly fatter one $2. Low and behold it worked. Now the one in the kit was brand new so I don't know why it didn't work, I used the oem part number when I bought it. Needless to say I was absolutly stoked when it worked. So I hope this can help someone before the bail out on there new repair kit.
    G:get S:some
    sorry about the pic being upside down
    Tags: None
    • chuck hahn
      Forum LongTimer
      Past Site Supporter
      • May 2009
      • 25918
      • Norman, Oklahoma
      #2
      The rebuild kits do indeed have an inferior oring with them. maybe tell us what size oring you got to work and we can just swap orings in existing petcocks from now on instead of buying kits!!! Whats the durometer? ID and OD???
      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

        Comment

        • tkent02
          Forum LongTimer
          Past Site Supporter
          • Jan 2006
          • 35571
          • Near South Park
          #3
          Chuck, I took a disassembled petcock in to the local O Ring Emporium and they were easily able to pick one that worked. Viton for gas, hardness is not really all that critical I don't think. Sorry I don't remember the size.

          Works fine, lasts a long time.
          http://img.photobucket.com/albums/v5...tatesMap-1.jpg

          Life is too short to ride an L.

            Comment

            • Catcalledsprocket
              #4
              Hey Chuck,
              Sorry mate I didn't take note of the size or if it was able to handle fuel or not,what a bozo! I just took the old one in and sized it up by eye. However I'm going back to that store today if I get time so I'll ask them what size it was and what it's made of. I did need the kit, although the diaphram was fine it was leaking just slightly from the face plate so I needed that rubber washer with the 5 holes in it and the 0-ring for the tap handle.

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