VIN: KZ750B-25701 <-> 033033
Engine: KZ750BE025701 <-> 033074
Colors: Luminous Dark Green, Luminous Dark Red
Characteristics that distinguish the ’78 model years from the ’77: Color, pinstripe layout/design (4 pinstripes; 3 green and one gold, merging at the top rear of tank, hidden behind seat front), front brake caliper re-located from the front of the fork leg to behind, new angular front master cylinder, modern stator/generator type (3-phase dynamo changed to single-phase in ’78), needle bearings in swingarm (instead of bushings), combination regulator/rectifier (changed from previously separate units), slight design tweaks in the output shaft assembly, recommended fork oil level, and there is some uncertainty about the recommended spark plug (B6ES/B8ES) between model years as dictated in the Kawasaki Service Manual.
Other model characteristics can be found in the Kawasaki Service Manual.
Here are some pictures to illustrate some of the important noteworthy model identifiers…
I believe this pic below was originally in a magazine review (not sure which):
This pic below credited to Garret of KawasakiMotorcycle Dot Org:
I believe this pic below comes from Kawasaki, perhaps from a manual or bulletin: