master cylinder rebuild

the master cylinder on my 82 750 csr is shot, it doesn't work at all, also the diaphram is shot as well. I can't seem to find a rebuild kit for that master cylinder. Is there other master cylinders that are the same as the one on my bike that I could use a rebuild kit for? Kawasaki doesn't seem to offer the piston/spring replacement parts anymore.

Thanks,
JohnJones
82 750CSR

johnjones750csr wrote: the master cylinder on my 82 750 csr is shot, it doesn't work at all, also the diaphram is shot as well. I can't seem to find a rebuild kit for that master cylinder. Is there other master cylinders that are the same as the one on my bike that I could use a rebuild kit for? Kawasaki doesn't seem to offer the piston/spring replacement parts anymore....

1982 KZ750-M1 CSR Twin

Kawasaki.com says M/C diaphragm part no. 43028-1008 is active, which means supposedly availble through Kawasaki dealerships.

M/C is common to 9 models:
KZ550-C1 (LTD) (1980)
KZ550-C2 (LTD) (1981)
KZ550-C3 (LTD) (1982)
KZ550-C4 (LTD) (1983)
KZ650-H1 (CSR) (1981)
KZ650-H2 (CSR) (1982)
KZ650-H3 (CSR) (1983)
KZ750-G1 (LTD II) (1980)
KZ750-M1 (CSR Twin) (1982)

Could contact Z1 Enterprises which lists many M/C parts for various models.

Often, disassembly plus careful and thorough cleaning will restore a horrible looking M/C to full serviceability, and sometimes without any new parts being needed.

Good Fortune!

Thank you, I'll take it apart tomorrow and see if I can clean it, the diaphragm is definatly shot though. But finding a rebuild kit will be easier now that I know what other bikes use the same one thank you very much

the fricken thing wont come apart lol...I did just like the book says and the piston will not come out.

This is the directions out of the factory manual

1. Remove screws
2 take off the master cylinder cap and diaphragm, and empty out the brake fluid.
3. Remove the locknut and pivot bold, and remove the brake lever
4. Using a thin-bladed screwdriver or some other suitable tool, press in the liner tabs which catch in the holes in the master cylinder, and then remover the liner
5. pull the piston and spring
6 remove the spring, dust seal, and piston stop from the piston


All the way up to step 5, everything goes smooth. Step 5 wont happen like the book says. the piston just wont come out, it's like there is some kinda retainer clip or something holding it in, but I don't see anything anywhere. It most certainly isn't coming apart like the book says though. I want to see if I can clean it and make it work again maybe, and if not, I want to make sure the piston bore is in good shape before I get a rebuild kit.

Thanks.

If needed, may use the link in my signature for help with navigating kawasaki.com to access the diagram listed as Front Master Cylinder in the component listing.




The piston might be corroded inside the bore, and difficult to remove.

Good Fortune!

You could get a mc from another bike or get a new aftermarket unit - usa-motorcycles-inc (sp?) on ebbaayy lists several. I'd guess you could go w either a 12.5mm or 14mm piston bore mc... assuming your bike has a single disk Fr Br.

Yes, I have that diagram in a factory service manual, I guess there is some corrosion in there, I guess I'll just have to pull harder lol. it's definatly stuck and doesn't want to come out.

yea, I can get one of those new from kawasaki, but the piston assy is definatly out of production, I'll find a rebuild kit somewhere if that ends up being what I need. I gotta get this one apart first and check the piston bore. If it's messed up, then I'll be looking for new new/used master cylinder. I'm not opposed to rebuilding something if that's all it needs though.