Keyster SD-1 Carb Diaphragms

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  • yamasutra
    New
    • Jun 2007
    • 3

    #1

    Keyster SD-1 Carb Diaphragms

    Has anybody replaced their carb diaphragms with this product? They're for sale on E-bay, but the supplier says that they are for 80-83 carbs. Any Ideas on how to proceed? I hesitant to use the rubber spray idea, simply because of the exposure to gas vapor. It seems as though my current diaphragms have some sort of fine mesh associated with their composition.
    Thank you.

    ebay link http://cgi.ebay.com/ebaymotors/ws/eB...ayphotohosting
  • skids
    XS-XJ Super Guru
    • Jul 2002
    • 5047
    • Florissant, CO, USA

    #2
    Re: Keyster SD-1 Carb Diaphragms

    Avoid coating big areas of the diaphragm because it can stiffen and then not function properly. Your goal is to plug holes.

    Originally posted by yamasutra
    I hesitant to use the rubber spray idea,
    Skids (Sid Hansen)

    Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

    Comment

    • TopCatGr58
      Administrator
      • Jul 2002
      • 12650
      • Portsmouth, Va.

      #3
      Hey Yamasutra,

      As they state, they are for the later year carbs, the 80-83 series that have the LARGER vacuum piston, so I don't think they will fit properly on the 78-79 slides, but don't know for sure? You might be able to fit them, and then SEAL them around where they mount to the slides with some gas proof flexible sealant!?

      Like Skids said, just try to seal up the little pinholes, much more economical!
      T.C.
      T. C. Gresham
      81SH "Godzilla" . . .1179cc super-rat.
      79SF "The Teacher" . . .basket case!
      History shows again and again,
      How nature points out the folly of men!

      Comment

      • Mathh
        XSive Maximus
        • Nov 2006
        • 663
        • Beek, Netherlands

        #4
        Overhere they sell Keyster Diaphragms (MXS1100) for all XS1100s' regardless of year:



        I have used them on my '79 without any problems..
        XS1100 3X0 '82 restomod, 2H9 '78 chain drive racer, 3H3 '79 customized.
        MV Agusta Brutale 910R '06.
        Triumph 1200 Speed Trophy '91, Triumph 1200 '93.
        Z1 '73 restomod, Z1A '74 yellow/green, KZ900 A4 '76 green.
        Yamaha MT-09 Tracer '15 grey.
        Kawasaki Z1300 DFI '84 modified, red.

        Comment

        • yamasutra
          New
          • Jun 2007
          • 3

          #5
          Thanks so much for all the replies! Any Ideas as to how to actually removed the Diaphragm from the Tube? Do I have to cut the plastic that keeps it in?

          Comment

          • Mathh
            XSive Maximus
            • Nov 2006
            • 663
            • Beek, Netherlands

            #6
            Yup! Made a cut in the side of the upper plastic ring on top of the diaphragm with a Dremel tool . Broke the remaining half mm open with a screwdriver. Afterwards glue and tighten the rings with a tiewrap.
            XS1100 3X0 '82 restomod, 2H9 '78 chain drive racer, 3H3 '79 customized.
            MV Agusta Brutale 910R '06.
            Triumph 1200 Speed Trophy '91, Triumph 1200 '93.
            Z1 '73 restomod, Z1A '74 yellow/green, KZ900 A4 '76 green.
            Yamaha MT-09 Tracer '15 grey.
            Kawasaki Z1300 DFI '84 modified, red.

            Comment

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