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Front master cylinder cap screw size

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    Front master cylinder cap screw size

    The cap screws on my 1982 GSX750 Katana front master cylinder are damaged and must be replaced. I can usually deduce the size from the part number, but in this case I can’t. The part number is 59691-49300. Any ideas?

    Cheers!
    K

    #2
    I bought a bunch of them off eBay a while ago:



    They are pretty generic for most MC caps - M4 x 10mm, however you could buy a longer version and trim them down to suit.
    Current:
    Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha :eek:)

    Past:
    VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
    And a bunch of other crap Yamahas....

    Comment


      #3
      Thanks. I shouldn't have been so lazy. :-)

      I matched it up to some extra screws I had laying around. It's actually a M5 x 10 countersink head.

      Cheers!
      K

      Comment


        #4
        Most master cylinder cap screws are M4 X 10 flat head.

        If it's M5, are you sure it's stock?
        1983 GS850G, Cosmos Blue.
        2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
        2015 Yamaha FJ-09, Magma Red Power Corrupts...
        Eat more venison.

        Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

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        Comment


          #5
          It certainly looks stock - it's identical to the the parts fiche. The rear master cylinder cap screws are definitely smaller, and their part number differs from the front cap screws.

          Comment


            #6
            My KZ1300 has M5 screws in the MC caps, but pretty much all the other ones I've seen are M4.
            Current:
            Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha :eek:)

            Past:
            VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
            And a bunch of other crap Yamahas....

            Comment

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