The fact that you haven't mentioned a compliance plate, means that its probably a 1983 model (KDX200A).
The B1 came out in 1984, and was fitted with a compliance plate. Same basic bike as the A, but with all of the ADR crap fitted, and a few mechanical revisions (different barrell/piston to stop the seizure problems, being the most significant).
The 85 model B2 is virtually identical to the B1, but has a blue seat cover (and IIRC, a blue shock spring).
Good bikes. I'm hanging to get my B1 finished.... I guess that starting on it would be a big step in the right direction...
Oh, and FWIW, I'm pretty sure that I read that Kawasaki Australia was selling KDX175s in 1983 - the 200 was a much better bike, but its lack of compliance plate meant that the 175 was kept on sale.