Early Z1 disc thickness?

[warren3200gt]

Any of you guys with early Z1's know if the euro bike twin disc option was thin or thick disc's?, or did thin twin discs come along after 75?

[wilsonsjw11]

Optional twin disc was as standard fitted to Z1.
Regards
Steve Wilson

[warren3200gt]

so were they thick or thin?

[CAT3]

Early single discs were 6.9 - 7.1mm thick, service limit is 6.0mm.
They also had six mounting bolts.
Optional twin discs fitted to the Z1's, A's & B's were two of these discs & a different master cylinder & a different splitter for the two hoses to the two calipers.

Later twin disc set-ups fitted to the '76 Z900-A4's, as standard, were 5.0mm. Looking in my service manual it doesn't give a service limit or original thickness for these discs.
USA A4's were fitted as standard with a single, thicker disc. However, I don't know for certain, but I would assume if the optional twin disc was fitted to a Yank bike it would two of the thicker discs.
These had four mounting bolts.

[warren3200gt]

guys, missing what Im asking. Early Z1's had as a factory option twin disc My question is was the twin disc option thick or thin disc's or was it 2 thick disc's? Does such a thing exist as 6 hole thin discs?

[CAT3]

There's no such thing, from Kawasaki anyway, as a thin six hole disc.

This is the reason it is easy to spot a Yank bike made to look like a UK bike.

[warren3200gt]

Ah, ok. thats why I cant find any! thanks

[CAT3]

I've had a look through the later '77 Z1000 manual & that too only gives the disc thickness & service limits for the thicker, earlier/USA discs.

[CAT3]

I've found the service limit for the thinner A4 discs, it's 4.5mm.
This figure is cast into the actual disc carriers.