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Thread: Front master cylinder help plz

  1. #1
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    Default 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????

    https://www.ebay.com/itm/36134928108...8AAOSw7UZbP7Lo
    Last edited by chuck hahn; 07-10-2021 at 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.

  2. #2
    rphillips is offline Forum Sage Past Site Supporter
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    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

  3. #3
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    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 at 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.

  4. #4
    Nessism's Avatar
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    Quote 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.

  5. #5
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    Thank you Ed. I shall place the order. If it doesnt work ill try again.
    Last edited by chuck hahn; 07-11-2021 at 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.

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

  7. #7
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    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.

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

  9. #9
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    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.

  10. #10
    rphillips is offline Forum Sage Past Site Supporter
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    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

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