alternative front master cylinder for my 82 gs1100?

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  • wes cooley
    • Jan 2026

    #1

    alternative front master cylinder for my 82 gs1100?

    anyone used anything a little more modern? bolt on and go? want to clean up the bars a bit.
  • Baatfam
    Forum LongTimer
    Past Site Supporter
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    • Jul 2006
    • 18745
    • Knoxville, TN

    #2
    Something like this?



    Thread here:
    Bob T. ~~ Play the GSR weekly photo game: Pic of Week Game
    '83 GS1100E ~ '24 Triumph Speed 400 ~ '01 TRIUMPH TT600 ~ '67 HONDA CUB

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    • Guest

      #3
      Or this nifty little number from Ebay (suitable when running a single rotor)

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      • rapidray
        Forum Guru
        GSResource Superstar
        • Oct 2006
        • 8195
        • So Cal

        #4
        I actually like all of the newer GSXR masters with the remote reservoirs. Then you can mount the reservoir however you need to just by making a bracket. Ray.

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        • Nessism
          Forum LongTimer
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          • Mar 2006
          • 35783
          • Torrance, CA

          #5
          If anyone know of a new 5/8" bore master cylinder that will take a stock Suzuki mirror please share.
          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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          • wes cooley

            #6
            close, very close.how about a nice radial one?

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            • Billy Ricks

              #7
              I use a GSXR master with the remote reservoir.

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              • wes cooley

                #8
                Originally posted by Billy Ricks
                I use a GSXR master with the remote reservoir.
                off what year? bore size? bolt on and go? thanks

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                • Baatfam
                  Forum LongTimer
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                  • Jul 2006
                  • 18745
                  • Knoxville, TN

                  #9
                  What bore size do we need with a dual discs???
                  Bob T. ~~ Play the GSR weekly photo game: Pic of Week Game
                  '83 GS1100E ~ '24 Triumph Speed 400 ~ '01 TRIUMPH TT600 ~ '67 HONDA CUB

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                  • Nessism
                    Forum LongTimer
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                    • Mar 2006
                    • 35783
                    • Torrance, CA

                    #10
                    Originally posted by Baatfam
                    What bore size do we need with a dual discs???
                    Suzuki used 5/8" for dual disc, 14mm for single.
                    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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                    • jwhelan65

                      #11
                      Originally posted by Nessism
                      Suzuki used 5/8" for dual disc, 14mm for single.

                      Maybe a naked Bandit set up??

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                      • tejasmud

                        #12
                        Not an 82' 1100, but here is an 06'-07' GSXR 1000 Master. It has a 3/4 marking in the master cylinder casting. Be it 3/4" (19mm) piston, not sure, but it is for dual calipers. No mirror mount though. Reason I went this route was with the clip-ons, a slim starter kill switch, and push-pull throttle there was no room to mount a OEM master.

                        It bolts on to 7/8" handle bars, just need to make sure to use the correct banjo bolt.






                        Also for the masters with the mirror mount boss the main thing is the thread direction, L vs. R, that becomes an issue. I've seen adaptors and stand alone mirror mounts, but depends on what you are after.

                        E

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                        • wes cooley

                          #13
                          right on, thanks. just what i'm looking for!

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                          • salty_monk
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                            • Oct 2006
                            • 14001
                            • London, UK to Redondo Beach, California

                            #14
                            Kawasaki Ninja (5/8" bore same as stock GS Twin Rotor)



                            GSXR Radial with 6 pot calipers



                            On the GSXR you can use the stock brake backplate (rider side of the bars) which has the mirror mount on it. The holes line up perfectly. You just have to be aware that the rider side is a little wider but you can even cut it down if necessary (I did in order to make it fit on the limited bar space I had).
                            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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                            • salty_monk
                              Forum LongTimer
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                              • Oct 2006
                              • 14001
                              • London, UK to Redondo Beach, California

                              #15
                              3/4" bore (19mm) will probably work & will just require less movement at the lever with correspondingly more force required in order to activate brakes.

                              Stock is 5/8" (16mm).

                              Stock single is 14mm as Ed has said. Requires more lever movement to work the brakes. Works on a stock dual setup but I wouldn't use it on anything that has a bigger piston as stock (i.e. don't go using a 14mm as a replacement for a stock 3/4" piston master).

                              Personally I have tried the 14mm piston on stock brakes & didn't like it. Too much lever movement & felt "spongey".

                              Dan
                              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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