1976 900A4 dual disc

DoctoRot wrote:
Also note that depending on the model the bore of the caliper piston will differ. Cant remember which are which off the top of my head but you can end up with a 38mm caliper piston or a 41. this will have a direct effect on the Master-cylinder to caliper ratio and should be taken into account. as two 38mm calipers will need a different sized MC than two 41mm calipers.

Höhe = high or length of the caliper piston

thats good info. its 43 instead of 41. gotta store these numbers somewhere more reliable than my brain.
dual 43mm single piston calipers would be a 14.9/1 ratio which would be softer.

asphalt900. I do plan on using the early KZ hard pipe to the caliper. I just purchased a '76 stock LH caliper, per the advice from Warren it can be used on the RH side. I can get the brake pipe. and hose bracket. I'd like your help with a model and year for the caliper to fork mounting bracket.

Scirocco and DoctoRot, thank you for the info. I amazed with the mechanical knowledge you and others on the form posses

Thanks Mikaw. I used the setup from the KZ650C3 except for the MC. I used the stock MC from the KZ900A. I sent the rotors to these guys for resurface and drilling.
r.search.aol.com/_ylt=Awr9Jm8yd9xdXycA2q...h47H3Rmg6Is376Yiotw-
Squealing is usually caused by the pad vibrating. A trick I've used for decades is to apply some high tem silicone to the back of the pads. This prevents the pads from vibrating.

Baldy110 your welcome. Thank you for the lead on the rotor refinisher, How luck is it that they are only 20 south of me... Bonus!!!

baldy110 wrote: A trick I've used for decades is to apply some high tem silicone to the back of the pads. This prevents the pads from vibrating.

Do you let it dry before assembly? How thick?

Asphalt900

Started searching thru fleaBay. Notice some of the caliper brackets have dimples in them. My stock LH bracket is that style, There look thinner than the smooth ones... Help Please

I was aware of the 78 Z1R and 78 Kz650-SR using the 38mm piston, but I'm not sure about the KZ1000A2. The Z1R and SR are both dual caliper, but the KZ1000A2 was still single, wasn't it? It seems like all of the single caliper bikes used the larger piston. Maybe the '78 KZ1000B2 and the '78 KZ1000-C1 (police) had the smaller piston, as those would have been dual disk?

I had the impression that the 38mm piston was only used on 1978 model years. That came from looking for parts when Kawasaki provided access to their full parts database, which had accurate part number info, would show obsolete and superseded parts, and allow one to cross reference a part with all models where it appeared.

The current on-line catalogs (partzilla) show the 38mm on 77 and 79 models, but I don't really trust the new databases.

It still drives me crazy that Kawasaki took down their real dealer quality pars catalog. All of the third party parts catalogs available now are no longer accurate (partzilla, etc.), and Kawasaki no longer has any way to cross reference parts. It sucks.

That's Clean! Baldy. Nice and clean and smooth! Like a fresh waxed *****
Got some similar ideas on parts. I sold a project on ebay last year. Only went up to $88 bucks.
Then I machined 2 - 7mm rotors after drilling the together! Like an idiot rookie! I never flipped 1 -180 degrees for other side! So the pattern is same. if used together one side is running backwards. So they are selling as 1 rotor for a KZ900 single.
h well, live and learn! []

Mikaw got you covered on the RH Caliper Holder. It's the smooth plate as "I think" most RH holders were all smooth Not dimpled. I HOPE the KZ900 caliper you purchased has a nice packing seal land and piston/casting land isn't all pitted-up. The correct period piston is 43048-006 for the KZ900 for reference and it's a 43mm, photo provided. Let me know what else you need after you get the caliper. As mentioned you can use a smear of silicone grease on back of pad to piston. I personally like Dow Corning High Vacuum Grease? Just make sure it's NOT petroleum based, petroleum based will leech into the pad material.

Mikaw wrote: Baldy110, are those NOS rotors or did you have them resurfaced? I looked locally here to find someone that could resurface the rear rotor on my '78 1000 B2 without any success. It squealed and I want to resurface it. Not have any luck I just put in new pads, but its already making noise. any recommendations?

The squealing usually comes from between the back of the pad and caliper. They sell an adhesive specifically for this, or you can trim a set of pad shims from a car to fit.