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Front Master Cylinder Rebuild Kit (Piston Cup Set) - GS550E

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    Front Master Cylinder Rebuild Kit (Piston Cup Set) - GS550E

    I am restoring a 1978 GS550E. I want to rebuild the front master cylinder but can't find an available piston cup set from partzilla, ebay, etc.

    Is there a suitable alternative (another mastery cylinder from another year) or a place to buy a piston cup set?

    Any help is deeply appreciated.

    #2
    I did some searching and yes, it’s not available at Parts Outlaw or a few others but it seems Alpha Sports thinks they still have it for about $50

    Buy parts at a low price for your snowmobile here at Alpha Sports, we carry a LARGE variety of parts and accesories.


    You may have to redrill into the page for your bike as the link won’t paste correctly for me today.

    Another alternative and one I did on my 550t is Salty Monk’s upgrade. Search on here for the information but it will mean you’ll need to change out the forks and steering stem. Advantage is that you’ll have newer brakes
    Cowboy Up or Quit. - Run Free Lou and Rest in Peace

    1981 GS550T - My First
    1981 GS550L - My Eldest Daughter's - Now Sold
    2007 GSF1250SA Bandit - My touring bike

    Sit tall in the saddle Hold your head up high
    Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
    and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride"

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      #3
      A brand new generic 14mm bore master cylinder can be bought off ebay for about $20 shipped. Master cylinders are simple devices that are hard to screw up so I'd go that route unless you are doing some faithful restoration and want the bike to be dead stock.
      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


        #4
        Thanks for the help and direction. I went ahead and ordered a piston cup set from alpha. I learned that it’s best to stick with stock during this restoration.

        now let’s see if the piston set ships.

        Comment


          #5
          Originally posted by Nessism View Post
          A brand new generic 14mm bore master cylinder can be bought off ebay for about $20 shipped. Master cylinders are simple devices that are hard to screw up so I'd go that route unless you are doing some faithful restoration and want the bike to be dead stock.
          as an aside, I've bought these before and used just its seals in the original. It was actually cheaper than a seal kit. and you get an extra micro-switch for the brakelight!

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