Don't know if any of you are aware of the method Kawasaki uses for designating years, but here is a quick FYI: When Kawasaki introduces a new bike platform it will always begin as an "A" model. For example the 1983 KX500A1. If Kawasaki does not make any major chassis upgrades, the following years bike will be called an "A2". When Kawasaki totally revamped the chassis in 1985, it then is labeled the "B1", and an '86 being the "B2". In 1987 they made a significant rear suspension change so now its a "C1" and so on. My '01 is an "E13", so the chassis is 13 years old (as is the technology, LOL).
If I remember right, Kawasaki's KE100 bike is like an "A16" model, so I guess you don't mess with a good selling bike....