Kz650 B1 dual conversion confirming

Hi everyone. I've been studing the forum un order to convert to dual disk my kz650 B1 and, if i understand, one way that goes nice is first twist the bottles (i can do it without problema, is It?) and buy a pair of gpz750 83-85 calipers. These calipers will fit bolt-on, without other invents?
And, of course, change the MC to a 16 mm.
What about the rotor? Can i install on the other side other rotor of kz650 B1? Or its better change both?
Thanks and sorry if this subjet was very written, i sure you i've been reading a lot!
Thanks

Keep in mind if you turn the bottom fork legs around the tabs for connecting the fender brackets will be facing forward instead of toward the rear. Ed

When I changed to dual discs I found a set of calipers off an LTD and got the 2 discs and splitter in the deal.
A dual disc setup has thinner discs than a single disc setup and there may be a difference in the calipers too.
Make sure you get a 5/8 master cylinder, the stock one for a single disc will not work right for a dual disc setup and can be dangerous.

Ok, thanks! I will post the news about my conversion.

I used two H2 calipers and stock KZ 900 disks on mine. The brakes worked fine on mine but I went with a larger GPZ master cylinder later. The stock disks are thick so thinking of unsprung weight I went with the later style stock drilled disks that are about half the weight. The disks are thinner but the holes caused a pulsing at the lever. I changed the brake pucks from organic to sintered and the pulsing went away. I'm happy with my setup and I have my solid disks as spares.
BTW, I turned the legs around and used two left hand calipers. I had to use a washer to shim one bolt on the left side and the bleeder valve is pointing down. I have to bleed that one at the banjo bolt and I can pick up a bracket for the left side at z1partsinc.net if I need to. They also have a caliper that will work for the left side but at this point there other things I'd rather spend money for the bike on.
Not sure about the 650's though but it seems parts for them are cheaper used than for the bigger fours.
Steve

I've done this a few times kz900 and a 1000 and starting another on the way, and s/s braided brake hoses with nice front hose brackets are a must have. I poor boyed the thousand with aftermarket rubber and seemed squeezy compared to the S/S set up, I like rock hard controls two finger style.

perper wrote: Hi everyone. I've been studing the forum un order to convert to dual disk my kz650 B1

Here are a few things to know about the KZ650 front brakes.

1) For KZ650 models that came with two front disks, the double disks are both thinner than the single disk, and they are also smaller diameter.

2) Forks on the two disk models have the caliper mounting holes located closer to the axle. The caliper brackets are the same for both models. Kawasaki changes the forks, not the calipers.

3) The smaller and thinner disks have the same bolt pattern and offset as the single disk. The 2-disk setup will bolt onto the KZ650B spoke wheel hub and work fine.

I had a 1979 Kz650B3. I bought a set of disks from a 2-disk model (Kz650C or D) and discovered that the disks were smaller diameter, so the calipers were not in the proper location. I then bought a set of forks from a 2-disk bike, and swapped the forks as well. The 2-disk setup worked great.

Some more info.....

The KZ650B and E models had front rotors with a swept area of 250mm and a thickness of 6.9-7.1mm. The KZ650C, D, and F models had front rotors with a swept area of 231mm and a thickness of 4.9-5.1mm. Ed