Stock '77 GS750 master cylinder piston bore size????

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    #1

    Stock '77 GS750 master cylinder piston bore size????

    Hey guys, can anyone tell me what the stock front master cylinder piston bore size is for a 1977 GS750 single disc?
    The bike came with aftermarket levers and i think they're a 14mm master cylinder.
    Ive had semi squishy brakes since i got the bikes. I rebuilt both the front and rear calipers today. The rear grabs great. The front grabs buts its definitely soft. I made sure to bleed them correctly. At first it fought me a little. I had an air bubble at the splitter block. I got that all sqaured away and its definitely soft. The rebuild kits went in great, i dont believe i have any issues there, however what I'm guessing is that the master cylinder bore might be a touch too small. Can anyone confirm stock bore size? Itd help me narrow down this issue.
  • uk gs nut
    Forum Mentor
    • Feb 2011
    • 691
    • Co durham uk

    #2
    I am sure the single disc master is 14mm, twin is 16mm
    My bikes 79 GS1000 1085 checked and approved by stator the GSR mascot :eagerness: 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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    • Agemax
      Forum Guru
      • Apr 2008
      • 8371
      • plymouth uk

      #3
      the size is usually embossed on the master cylinder casting somewhere.
      1978 GS1085.

      Just remember, an opinion without 3.14 is just an onion!

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