Diaphragm Replacement

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  • arfnlm8634
    Forum Newbie
    • Aug 2021
    • 2
    • Marshfield, ME

    #1

    Diaphragm Replacement

    Would someone please tell me how to replace the diaphragm on the slide throttle? Also, are the slide/diaphragm assemblies interchangeable between a BS32SS and a BS34SS?
  • Nessism
    Forum LongTimer
    GSResource Superstar
    Past Site Supporter
    Super Site Supporter
    • Mar 2006
    • 35787
    • Torrance, CA

    #2
    32 and 34 slides are different. You can look up the PN's for yourself, using one of the various OEM part suppliers available online.

    I have replaced diaphragms before by carefully uncrimping the lip on the slide which secures the diaphragm's plastic retaining ring. The lip will likely crack and break off in places, but if you are careful, you can typically preserve enough of the lip to adequately secure the ring again, after the diaphragm is replaced. It's not without risk, but doable.
    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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    • LAB3
      Forum Sage
      Past Site Supporter
      • Mar 2018
      • 3491
      • No fixed address

      #3
      I've not tried this supplier but have read good reviews on other boards. They have the diaphragms and instructions on their site.

      JBM Industries rubber carburetor holder socket boots, flange intake sockets, vibration isolators, stainless steel exhaust springs, for Rotax 912, 582, 503, 447, 377, Zenoah & HKS engines. Yamaha 650 SX and TX Mikuni BS-38 and 34 CV carbs. Diaphragms & holders.
      2001 Kawasaki Voyager XII (Current bike)
      1982 GS450txz (former bike)

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      • deven5498
        Forum Apprentice
        • Sep 2011
        • 33
        • Baltimore, OH

        #4
        Is there an expected lifespan for the CV diaphragm? Seems we will all run out of NOS as some point.
        KID
        1980 GS1000G Full vetter touring pack (getting closer)

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        • Rich82GS750TZ
          Forum Guru
          Past Site Supporter
          Super Site Supporter
          • Jun 2018
          • 5568
          • Mifflinburg, PA / Land of Tar & Chip

          #5
          42 years and going strong. Just had 1 of the 4 out and still pliable with no signs of wear. I think it may depend on use. My bike does not have multi-year periods of sitting idle. My guess is if the diaphragms are worked regularly they stay pliable. This is only a guess.
          Links

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          • arfnlm8634
            Forum Newbie
            • Aug 2021
            • 2
            • Marshfield, ME

            #6
            Thank you all for your input. I appreciate it.

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