Author Topic: Dumb question  (Read 1989 times)

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Offline Mrjoshuajones

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Dumb question
« on: February 14, 2014, 11:44:51 PM »
I'm redoing everything on my bars and I have no clue what size to get for the master cylinder. I have a 1975 XS500B. I'm shopping around online and am baffled by the options. I need info and maybe a link to something affordable. This is the one thing so far that has surprised me on how expensive they are. Any help?
Oh, and I am using some 14 inch high bars so longer rigging is needed.

Offline CrouchyUK

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Re: Dumb question
« Reply #1 on: February 14, 2014, 11:53:49 PM »
US single front disc?

Plenty on mikesxs to choose from.  I think it's actually cheaper and safer to buy new rather than try and refurb an old one sometimes....

https://www.mikesxs.net/products-71.html#products
1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline Mrjoshuajones

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Re: Dumb question
« Reply #2 on: February 15, 2014, 12:01:27 AM »
Yup. US single front disc. So I'm looking for 13mm?

Offline CrouchyUK

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Re: Dumb question
« Reply #3 on: February 15, 2014, 12:11:03 AM »
If you are keeping the cast twin piston caliper, then OEM master cyl would have been 5/8" or 16mm.  13mm would give you fiercer brakes but more lever travel- hydraulic principle.
1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline Mrjoshuajones

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Re: Dumb question
« Reply #4 on: February 15, 2014, 12:14:13 AM »
Thanks. First time I've ever messed with a master cylinder so I'm a bit out of my comfort zone and I have no idea what I'm doing. But that makes it fun.

Offline CrouchyUK

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Re: Dumb question
« Reply #5 on: February 15, 2014, 12:20:48 AM »
Nothing like trying something new!

Twin disk "B"'s that went into Europe had 22mm master cyls, otherwise the brakes would have thrown us over the bars.

Remember to consider how you will operate the brake light- original has the pressure switch on the splitter manifold, later bikes had a switch on the lever....
1975 Honda CB200T (2) - 1975 Yamaha XS500B (2) - 1976 Yamaha XS500C
1977 Yamaha RD400D - 1977 Yamaha XS500D - 1978 Honda CB550K - 1980 Honda CB400N
1980 Honda CB900FA - 2000 Kawasaki ZX6-RG2 - 2002 Suzuki GSX-R1000K2

Offline nigecollier

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Re: Dumb question
« Reply #6 on: February 18, 2014, 09:08:57 PM »
Building lots of race bikes this is something I play with a lot, be carefull you can end up with a rock hard or spongy front brake if the ratio does no match the caliper, heres a usefull guide
http://www.tz350.net/tzperformance.htm