[gunsmoker]

With a VIN off the frame,
and an engine ID Number off the engine block itself, you should be able to look up all the details and specifications for that particular machine.

(I think--- assuming older Kawasaki's have reference books and materials out there the way older Honda bikes do.)

 

[gunsmoker]

 

[gunsmoker]

the black bike w/red trim says its a model
305 CSR.

Here's a vintage article published in 1981 about this model Kawasaki bike.

Kawasaki Kz305 Csr | Cycle World | MAY 1981

magazine.cycleworld.com