Single and dual Rotors

Does anyone know offhand if the single rotors from the single disk set up in 1977-1978 Kz1000 or the KZ1000 LTD dual disk, both use the same four four bolt rotors?
Wordy but , same rotors?

Not positive but I think the duels are a little thinner and you have to go with a 5/8 master cylinder.
I'll check later

The bolt pattern is the same on the mag and wire rims

Yes, I have them on mine. I used a KZ 900 wheel to have them then got later stock drilled disks.
Steve

They worked with the single master but I got a GPZ one later. I can lock the front tire at 45 and had to one day behind a dumb B**ch.
Steve

The bolt pattern may be the same, but the dual disk rotors are thinner than those on the single disk models, and as mentioned the dual disk models use the larger 5/8" bore master cylinder rather than the 14mm one. Ed

Had no problems.
Steve

650ed wrote: The bolt pattern may be the same, but the dual disk rotors are thinner than those on the single disk models, and as mentioned the dual disk models use the larger 5/8" bore master cylinder rather than the 14mm one. Ed

So the issue is, I have replaced the front brake pads with factory ones and that damn squeal is back.
Previously, I pulled it apart and used a flat block with 240 grit crocus cloth and spun the wheel holding the block on both sides of the rotor.... that seemed to have broken a glaze on the rotor and the squeal stopped.... for about 400-500 miles but now it's back and the rotor looks rather glazed again...
So I have the complete dual brake system off a 1977 LTD with calipers, lines, rotors, brake line block, switch and master cylinder assembly... etc....
What I was wondering is if one of those rotors will replace the single one I have on the bike now....?
Or maybe just take my original single rotor to a machine shop for proper resurfacing?

I had a terrible squeal with my single and went to the drilled double disks like what Steve has and don't have any more trouble unless I ride on dusty roads.
Then I just hold the front brake and give her some gas from a stop and that usually cleans them up.
I guess you could probably go with a single LTD disk if you aren't road racing and have to worry about warping the disk, I don't remember if the Calipers are different from stock to LTD

If you have room to take the original down then go for it but you only have so much material you can take off, I use a disc sander to clean mine.

I once installed new EBC pads on my KZ650-C1 and they squealed so badly that dogs would howl. I tried disk brake anti squeal and just about everything else I could think of without success. Finally, I cut a chamfer on the leading and trailing edges of the pads and the squeal went away. It may have just been a coincidence, but at least the squeal never returned. Ed

I'll try that.
I had a similar thing happen on different bike and I found that cutting a plus sign with a hacksaw, right through the brake material but not to the metal backing.... really helped a lot ... and the squeal frequency was way way higher pitched and not so annoying.
I tried this with one cross cut on the old pucks and it did nothing.
I don't want to do that to these real, Kawasaki branded, new old stock pucks.

650ed wrote: I once installed new EBC pads on my KZ650-C1 and they squealed so badly that dogs would howl. I tried disk brake anti squeal and just about everything else I could think of without success. Finally, I cut a chamfer on the leading and trailing edges of the pads and the squeal went away. It may have just been a coincidence, but at least the squeal never returned. Ed

+1

I had some square cut pads for a car and they squealed like crazy even with anti-squeal shims. Finally broke down an bought the more expensive "faceted" pads... basically chamfered edges, and the squeal completely went away. The chamfers were pretty significant on leading and trailing edges.

Something like these. I see they have the grooves cut in as well.

Could be something as simple as the master cylinder not releasing all the way. I had one and hard braked a few times and it went away.
Steve