Vacuum petcock problems gs550 1978

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  • Wijnand
    Forum Newbie
    • Feb 2017
    • 7
    • Nijmegen, The Netherlands
    #1

    Vacuum petcock problems gs550 1978

    The vacuum petcock of my GS550D 1978 leaked gas. I solved the problem by stretching the spring. But I am a little bit afraid the leaking will start again. It seems that this type of petcock (4430047011) was not used in other types of GS bikes. So I couldn't find a petcock repairkit on the internet. An OEM petcock is rather expensive (more then ?100,-) Is replacing the vacuum petcock by a normal petcock a solution? And has anybody a suggestion for what type? Or does anybody know where I can get a proper repairkit?

    Greetings,

    Wijnand
    The Netherlands
    Tags: None
    • GSXR7ED
      Forum LongTimer
      Past Site Supporter
      • Dec 2012
      • 10145
      • DE via L.A.
      #2
      How much are you willing to spend on a new OEM petcock?

      Reason I ask, rebuild kits aren't worth it.


      Ed
      GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
      GS750TZ Parts Bike [Seq#6036]
      GSX-R750Y (Sold)

      my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

        Comment

        • tom203
          Forum Guru
          Past Site Supporter
          • Aug 2010
          • 8925
          • Norway,Maine
          #3
          Does your petcock look like this.. note orientation of fittings

          http://www.partsoutlaw.com/oemparts/...dcc5/fuel-cock
          1981 gs650L

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

            Comment

            • GSXR7ED
              Forum LongTimer
              Past Site Supporter
              • Dec 2012
              • 10145
              • DE via L.A.
              #4
              This is the one I researched...it's $100+. These parts don't come cheap. But if you want a stellar bike...

              http://www.partsoutlaw.com/oemparts/...c631/fuel-cock


              Ed
              Last edited by GSXR7ED; 08-17-2017, 05:06 PM.
              GS750TZ V&H/4-1, Progressive Shocks, Rebuilt MC/braided line, Tarozzi Stabilizer[Seq#2312]
              GS750TZ Parts Bike [Seq#6036]
              GSX-R750Y (Sold)

              my opinion shouldn't be taken as gospel or in any way that would lead you to believe otherwise (30Sep2021)

                Comment

                • aclaytonb
                  #5
                  I also stretched the spring and mine now works. Already tried a K&L kit. Tolerances were terrible on the second go-round, after I received a mislabeled part on the first go-round. I'm buying a new vacuum unit once this one gives up the ghost. Saw K&L type replacement units but if they're petcocks are as bad as their replacement parts... .

                    Comment

                    • tom203
                      Forum Guru
                      Past Site Supporter
                      • Aug 2010
                      • 8925
                      • Norway,Maine
                      #6
                      "Saw K&L type replacement units but if they're petcocks are as bad as their replacement parts... ."

                      their replacement kits are for their newer petcocks, not the 35 year made ones - manufacturing processes change, so new parts don't fit the old. I've been using what is likely a k& l unit from georgefix.com with no issues for 5+ years. Still available for about $50 or less
                      1981 gs650L

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

                        Comment

                        • Wijnand
                          Forum Newbie
                          • Feb 2017
                          • 7
                          • Nijmegen, The Netherlands
                          #7
                          Thanks for the answers! I think that spending money on a new OEM petcock will be the best solution.

                          Wijnand

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