Technically speaking, the 85+ models are not carry-over bikes due to differences in the motor (centre vs side exhaust port, and power valve vs not), and the frame (centre vs side exhaust port).
I recall someone (Doc?), saying that the JDM 84 models had the AEC & centre exhaust port - and would therefore make the 85+ bikes legit.
That said, it's one of those things that wouldn't likely be a problem...