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GS750 front master cylinder piston and cup replacement

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    GS750 front master cylinder piston and cup replacement

    Just received a replacement piston and cup set (Tourmax MSB-317) for my 1977 GS750B. I should've stripped the master cylinder first (schoolboy error!) and checked the bore size, as the Tourmax is 14mm diam and mine is 15.7 mm diam ish (piston seal diam). I think previous owner has fitted cast wheels and twin disc set up so the master cylinder is not the standard one but off a later model GS with twin disc setup?
    Seem to be struggling finding a piston and cup set for my master cylinder, can someone confirm that the Suzuki 59600-45811 is the 16mm bore version? Also everywhere I seem to look this is discontinued or out of stock! any advice would be welcomed. Thanks

    #2
    Unless your bike is a full on "restoration" and you are going for originality, I'd ditch the master and get a new one. 5/8" or 16mm, both will work.
    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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      #3
      Bantit 1200 masters work well, and have span adjustment
      My bikes 79 GS1000 1085 checked and approved by stator the GSR mascot and 77 GS750 with 850 top end, GS850g, and my eldest sons 78 GS550, youngest sons GS125. Project bike 79 GS1000N

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