petcock will not shut off

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  • snackie
    • Jan 2026

    #1

    petcock will not shut off

    Hello all,

    My petcock is passing fuel in all positions. Don't have the tank on the bike. Any thoughts why?

    Thanks!
  • Guest

    #2
    It is junk you need a new one . Check with Z1 they will have one

    Comment

    • snackie

      #3
      It Works

      Originally posted by hjfisk
      It is junk you need a new one . Check with Z1 they will have one
      Took it apart, inspected it, put it back together and it works again. Go figure.

      Comment

      • Guest

        #4
        Originally posted by snackie
        Took it apart, inspected it, put it back together and it works again. Go figure.
        it will be for a limited time only

        Comment

        • BassCliff

          #5
          Hi,

          Yes, the rubber, diaphragm, spring, mating surfaces, etc, are 30 years old. It may last for years. It may last a week. Be prepared to replaced it and then you won't have to think about it for another 20 or 30 years.


          Thank you for your indulgence,

          BassCliff

          Comment

          • jwhelan65

            #6
            Do yourself a favor and buy a new one as mentioned above, you are on borrowed time.

            Comment

            • Crage

              #7
              You will start seeing your oil level rise soon. Keep an eye on it.

              Comment

              • Guest

                #8
                Originally posted by Crage
                You will start seeing your oil level rise soon. Keep an eye on it.
                And when it rises do not run your bike you will destroy the lower end, bearings don't like gas , and a 650 G is an insert bearing motor

                Comment

                • snackie

                  #9
                  Kit or New Petcock?

                  Would you recommend a kit or new petcock? Doesn't appear that Z1 has a petcock for the GS650G.

                  Comment

                  • tom203
                    Forum Guru
                    Past Site Supporter
                    • Aug 2010
                    • 8925
                    • Norway,Maine

                    #10
                    Sure they do

                    Z1 Enterprises specializes in quality Motorcycle parts for Honda, Kawasaki, Suzuki and Yamaha Classic Japanese motorcycles from the 1970's and 1980's.


                    two models- one hits reserve later (cheaper one)
                    You need the two special washers that go under tank mounting bolts also
                    1981 gs650L

                    "We are all born ignorant, but you have to work hard to stay stupid" Ben Franklin

                    Comment

                    • Larry D
                      Forum Sage
                      Past Site Supporter
                      • Jul 2008
                      • 4926
                      • Indianapolis,IN

                      #11
                      Highly recommend getting a new one.
                      Larry D
                      1980 GS450S
                      1981 GS450S
                      2003 Heritage Softtail

                      Comment

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