Front master cylinder help plz

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  • chuck hahn
    Forum LongTimer
    Past Site Supporter
    • May 2009
    • 25925
    • Norman, Oklahoma
    #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????

    Pardon Our Interruption...
    https://www.ebay.com/itm/361349281087?epid=171259797&hash=item542218753f:g:Mv8AAOSw7UZbP7Lo
    Last edited by chuck hahn; 07-10-2021, 10:10 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
    • rphillips
      Forum Guru
      Past Site Supporter
      Super Site Supporter
      • Jun 2005
      • 7622
      • Norene TN
      #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

        • chuck hahn
          Forum LongTimer
          Past Site Supporter
          • May 2009
          • 25925
          • Norman, Oklahoma
          #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, 10:10 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

            • Nessism
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Mar 2006
              • 35792
              • Torrance, CA
              #4
              Originally posted by chuck hahn
              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

                • chuck hahn
                  Forum LongTimer
                  Past Site Supporter
                  • May 2009
                  • 25925
                  • Norman, Oklahoma
                  #5
                  Thank you Ed. I shall place the order. If it doesnt work ill try again.
                  Last edited by chuck hahn; 07-11-2021, 07:30 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

                    • Nessism
                      Forum LongTimer
                      GSResource Superstar
                      Past Site Supporter
                      Super Site Supporter
                      • Mar 2006
                      • 35792
                      • Torrance, CA
                      #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

                        • chuck hahn
                          Forum LongTimer
                          Past Site Supporter
                          • May 2009
                          • 25925
                          • Norman, Oklahoma
                          #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

                            • Nessism
                              Forum LongTimer
                              GSResource Superstar
                              Past Site Supporter
                              Super Site Supporter
                              • Mar 2006
                              • 35792
                              • Torrance, CA
                              #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

                                • chuck hahn
                                  Forum LongTimer
                                  Past Site Supporter
                                  • May 2009
                                  • 25925
                                  • Norman, Oklahoma
                                  #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

                                    • rphillips
                                      Forum Guru
                                      Past Site Supporter
                                      Super Site Supporter
                                      • Jun 2005
                                      • 7622
                                      • Norene TN
                                      #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

                                        • hannibal
                                          Forum Sage
                                          • Jun 2015
                                          • 1033
                                          • Washington DC
                                          #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

                                            • salty_monk
                                              Forum LongTimer
                                              GSResource Superstar
                                              Past Site Supporter
                                              Super Site Supporter
                                              • Oct 2006
                                              • 14002
                                              • London, UK to Redondo Beach, California
                                              #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

                                              https://www.mikesxs.net/yamaha-xs650...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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