By cchratx: I mistyped. It's a Kz550. .... It is a shaft drive.
I'm seeing a chain in the 2nd pic, looking thru the wheel. Looks like a KZ550C Ltd. The solid silver muffler stay indicates that it's a 1980 model, but I guess it's possible someone swapped it out or the first year type could have been used on some 1981 models (never seen that done before, though). The muffler stay is what supports the muffler, footpeg & brake pedal.
In case the vin has been re-stamped, you could compare vins on EB to other Kawasaki models of the era, especially 550s of course. just to make sure the number & letter style look right.
CycleChaos dot com has vin & engine number info.