This was originally from a 1977 KZ650-C1.

The following service has been performed on it:

1. Completely disassembled, 

2. Exterior vapor blasted, 

3. Ultrasonically cleaned, 

4. Bore inspected for pits and polished

5. New cup and ring seals installed and 

6. New banjo bolts, copper seals, and mounting bolts  installed. 

I guarantee this item to function like new.