Dual disc master cylinder

Barrel reservoir master cylinder was 14mm bore with single disc 1973 Z1 through 1977 KZ1000-A1, and enlarged to 5/8" bore for dual discs on the 1976 KZ900-B1 LTD.

1978 KZ1000-A2 introduced trapezoid reservoir with single disc, and was the only year for this smaller bore trapezoid master cylinder (piston assembly part no. 43020-1002).

Trapezoid was continued in later years with larger bore m/c for the dual discs.

Master cylinder bore size is often marked on the underside as 14mm or 5/8"

Good Fortune!

i did look on the underside and did not see anything that i thought was size related, but i will have a closer look.

Thanks Patton.

Here's how the underside of the '77 KZ650-C1 MC (round MC) is marked:

i'll have a look when i get home tomorrow.
now if i see that on the bottom off mine, i'm going to feel like a dummy.
Thanks ED
:laugh:

Nope. no size stamped on the bottom of mine.

Hi Mark, You should have bought this one.
It is the last one I had, It only sold for $49.00.
(No shill Bidding here! I'm honest, Not like "OINK")
cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=110919277166
I paid $45.00 plus shipping for the Kawasaki factory rebuild kit from Jeff Saunders @ Z1 Ent.
I gave my machinist friend $100 to bore 4 of these. $25 each?
The core master cyl., worth $25 all day long on ebay.
Labor and time to take apart and clean and glass bead, $25.
Ebay fees and paypal fees. ??
Man, "IT COST ME $50" to sell this master cylinder to someone else!
Go figure ebay?????
Why do I do it?

If you don't mind me asking, where are you getting the calipers from? I'd very much like to get a set, if I could afford them. I've only ever seen them on customs from the motherland though. All I know of over here are the Grimeca copies that have smaller pistons, and supposedly aren't as good.

Maybe a stupid question but will any dual disc splitter work on a early 75 Z1?

VenturaRider wrote: Maybe a stupid question but will any dual disc splitter work on a early 75 Z1?

yes any will work, but the later models have dual outlets.

Mercury Kid wrote: If you don't mind me asking, where are you getting the calipers from? I'd very much like to get a set, if I could afford them. I've only ever seen them on customs from the motherland though. All I know of over here are the Grimeca copies that have smaller pistons, and supposedly aren't as good.

I believe there's one US distributor for AP Racing motorcycle calipers, GP Tech, LLC: www.gptechllc.com/ . However there are a few friendly KZRs on the otherside of the pond who've volunteered to ship some things over. I think it was something like $100 cheaper to do it that way than buy it through GP Tech.

Web!ke
They've got several caliper/disc combos and all the other pieces too if you got money to burn...

DiamondSkyBlue1000 wrote: Web!ke
They've got several caliper/disc combos and all the other pieces too if you got money to burn...

Haha if you don't have money to burn, you can put together the same things for half of what PMC is asking. Those are PMC kits, Z1E can get them, but as you can see, they are NOT cheap.