petrol tap/cock

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  • blackhallr
    • Jan 2026
    #1

    petrol tap/cock

    hi all,when rebuilding a petrol tap/cock(gs750/1978) do i use sealant when reassembling,regards john.
    Tags: None
    • tom203
      Forum Guru
      Past Site Supporter
      • Aug 2010
      • 8925
      • Norway,Maine
      #2
      Between petcock and tank underside, there should be a nice oval o-ring to seal.Also special "sealing" washers under mounting bolts. Be aware that rebuilding petcocks is an iffy sport- the new stuff usually doesn't quite fit the 30+ old petcock casting.
      1981 gs650L

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

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        • blackhallr
          #3
          hi tom,when i replace the square vacume rubber do i put gasket sealant around the edge or just bolt up as is,regards j.

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            • Steve
              GS Whisperer
              • Jun 2005
              • 35924
              • southwest oHIo
              #4
              No sealant required.

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                • blackhallr
                  #5
                  hi steve,cheers,regards john.

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                    • Guest
                      #6
                      Originally posted by blackhallr
                      hi all,when rebuilding a petrol tap/cock(gs750/1978) do i use sealant when reassembling,regards john.

                      As it was just atested too, rebuilding a petcock is most time an act of futility. Try yours and see if it works, if not, time to order a new one. Just be prepared.

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