Vacuum petcock

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  • letchworth rider
    Forum Mentor
    • May 2010
    • 105

    #16
    Answer to my issue. The rubber check valve (#5) does not hold in my petcock for prime.

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    • rphillips
      Forum Guru
      Past Site Supporter
      Super Site Supporter
      • Jun 2005
      • 7611
      • Norene TN

      #17
      If I'm understanding this right, with Uncategorized Groups not holding vacuum, your petcock will work the same in PRI as in ON.
      1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

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      • Nessism
        Forum LongTimer
        GSResource Superstar
        Past Site Supporter
        Super Site Supporter
        • Mar 2006
        • 35787
        • Torrance, CA

        #18
        Originally posted by letchworth rider
        Answer to my issue. The rubber check valve (#5) does not hold in my petcock for prime.
        I've had the same problem with those petcocks. Even new and/or low mileage ones.
        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

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        • oldGSfan
          Forum Sage
          Past Site Supporter
          • Jul 2018
          • 1319
          • Southern California

          #19
          Originally posted by Nessism

          I've had the same problem with those petcocks. Even new and/or low mileage ones.
          I had the problem with an OEM one I got for my GS1100E. It was over $100 from Partzilla, sat on shelf a while as the bike was rebuilt so it was past return date. I put a T fitting on it and used a MityVac when needed. Really disappointing though. Then I got a cheap Amazon one for my GS1000 and it never gave any trouble.
          Tom

          '82 GS1100E Mr. Turbo
          '79 GS100E
          Other non Suzuki bikes

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          • letchworth rider
            Forum Mentor
            • May 2010
            • 105

            #20
            Would like to get a vacuum with a lever, but everyone I find has the line fittings on the wrong side. looks like it is specific to this vintage. I will keep looking for another month, then back together for riding!

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            • Gorminrider
              Forum Sage
              Past Site Supporter
              • Aug 2012
              • 4803
              • British Columbia, Canada

              #21
              This one, for a GSX400EX, has the pipe facing fwd...but they are chunky ..and many places will offer the wrong one as replacement:
              part 44300-44171 (below) is NOT the same as 44300-4470 even if the screw-hole fit is the same. i don't know where to get a new 44171-with similar difficulties part-wise,I had to rebuild mine

              .GSX400EX petcock.jpg
              Last edited by Gorminrider; 03-15-2023, 09:37 AM.

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              • letchworth rider
                Forum Mentor
                • May 2010
                • 105

                #22
                Has anyone changed the the petcock over on this model and year? It is in a different location on others.
                Last edited by letchworth rider; 03-17-2023, 04:20 PM.

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                • Nessism
                  Forum LongTimer
                  GSResource Superstar
                  Past Site Supporter
                  Super Site Supporter
                  • Mar 2006
                  • 35787
                  • Torrance, CA

                  #23
                  The leverless petcock uses 50mm bolt spacing. I'm unaware of any other petcocks that have this spacing. Also realize, Suzuki went to that petcock because of carb clearance issues. If you change up, make sure you will have clearance.
                  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

                  • letchworth rider
                    Forum Mentor
                    • May 2010
                    • 105

                    #24
                    That is what I am seeing also.

                    Comment

                    • Suzukian
                      Forum Sage
                      • Sep 2022
                      • 1032
                      • Connecticut

                      #25
                      There is a miniature type manual Bulb primer pump, like the ones used on small boats, it might fit in line of the fuel line. $6 bucks.

                      https://www.amazon.com/JRL-Primer-Ru.../dp/B07H2Y944L

                      Bulb small primer.jpg

                      Comment

                      • letchworth rider
                        Forum Mentor
                        • May 2010
                        • 105

                        #26
                        Problem solved. Ordered a new vacuum petcock from Everett Motorsports. Works as designed. Prime is slot vertical. Crank enough to get vacuum and it stays open until turned horizontal for run. Then shuts off when engine is shut down.

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