im new here and im trying to get my 81 kz650 running does anyone know were i can get a rebuild kit for the master brake cylinder and a replacement headlight sealed unit bulb

 

You are going to have to either buy a used or aftermarket headlight it seems. Your best bet is to go to a kawasaki dealer and ask them if they have any idea

 

Go find an H3 reflector and bulb. I thought they already had the H3 set up, but possibly not. I'm sure you can easily find a used headlight reflector from another year Kaw.

As for a rebuild, tear it down and go buy the individual parts needed from Kaw. 99% chance they are still available.

 

Does anyone know what universal master cylinder will work for a 1981 kz650 car h1?