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Front master cylinder help plz

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    #1

    Front master cylinder help plz

    The front master cylinder i bought to replace the pitted original has the round reservoir cup and looks exactly like the old one. On the bottom it says 5/8 and the piston measures 15.81MM. What rebuild kit do i need? Thanks.

    I assume this is the correct one????

    Front Brake Master Cylinder kit Suzuki GS750 GS850 GS1000 GS1100 GS1150 32-1083 | eBay
    https://www.ebay.com/itm/361349281087?epid=171259797&hash=item542218753f:g:Mv8AAOSw7UZbP7Lo
    85-86 GS1150 EF/EF2/EG/ESG GS1150E. 80-81 GS850 GT/GX GS850G. 82-83 GS1100 GZ/GD/GLZ/GLD GS1100GZ GS1100GLZ GS1100GD GS1100GLD. 82-84 GS1100 GKZ/GK2/GKD/GKE GS1100GKZ GS1100GK2 GS1100GKD GS1100GKE GS1100G.
    Last edited by chuck hahn; 07-10-2021, 11:10 PM. Reason: CORRECTED INFORMATION.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.
    Tags: None
    #2
    I'm not understanding exactly what you bought. The ebay add should have told what model bike the MC came off of, or are you saying you've bought an after mkt. MC off ebay?
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

    Comment

      #3
      The bike was a 78C model originally. Bore rotted out. I changed front and back rims to mags and set it up like an E model. I bought a master from a member here long ago and forget what it was supposed to be off. Thus the only info i have is whats cast on the housing and the measurement of the bore....which is way bigger than the C model bore. C model is a 14MM bore and this bigger one is 16MM. What i need to know is what rebuild kit is for the bigger master.
      Last edited by chuck hahn; 07-10-2021, 11:10 PM.
      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

      Comment

        #4
        Originally posted by chuck hahn View Post
        The front master cylinder i bought to replace the pitted original has the round reservoir cup and looks exactly like the old one. On the bottom it says 5/8 and the piston measures 15.81MM. What rebuild kit do i need? Thanks.

        I assume this is the correct one????

        https://www.ebay.com/itm/36134928108...8AAOSw7UZbP7Lo
        That kit is for the later year GS's w/dual disc according to the application info.
        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

        Comment

          #5
          Thank you Ed. I shall place the order. If it doesnt work ill try again.
          Last edited by chuck hahn; 07-11-2021, 08:30 AM.
          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

          Comment

            #6
            chuck, you should look for a proper kit, not one that doesn't match your master.
            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

            Comment

              #7
              Well if i knew what year and model it came off of i would ......
              MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
              1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

              NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


              I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

              Comment

                #8
                I'm under the impression that it's the pre 1980 bikes that used the round cap master.
                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

                Comment

                  #9
                  You are correct. Round reservoir and it has 5/8 on the underside
                  MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                  1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                  NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                  I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                  Comment

                    #10
                    Dang!!! That K&L Supply Co. application chart is really confusing. The only Suzuki GS1000 chain dr. I saw listed there was for the GS1000SZ, part # 32-1083. Nothing listed for any other chain dr. GS1000.
                    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

                    Comment

                      #11
                      From my research, 59600-45811 is the part number for the rebuild kit for the 5/8" master cylinder.
                      Jordan

                      1977 Suzuki GS750 (My first bike)
                      2000 Kawasaki ZRX1100
                      1973 BMW R75/5

                      Comment

                        #12
                        The 78 GS1000E would be my guess.... right bore size and style for the dual brake bikes.

                        these look decent to me for the price but not stock

                        Master Cylinder - Brake - Front - 7/8 inch - RD350 - TX500 - TX750 - XS650 - Black
                        https://www.mikesxs.net/yamaha-xs650-76-type-single-master-cylinder-oem-366-25850-02-00-366-25850-02-00.html?utm_campaign=694122_Mikes%20XS%20Retro%20Master%20Cylinders%20July%202021%20Wk2&utm_medium=email&utm_source=Revival%20Parts&dm_i=4C4Z,EVL6,4B9557,1KE7X,1
                        1980 GS1000G - Sold
                        1978 GS1000E - Finished!
                        1980 GS550E - Fixed & given to a friend
                        1983 GS750ES Special - Sold
                        2009 KLR 650 - Sold - gone to TX!
                        1982 GS1100G - Rebuilt and finished. - Sold
                        2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

                        www.parasiticsanalytics.com

                        TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

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