IT 200 went to 87, it was basically the same bike as the 84 but with a disc front end which first appeared in 86. It appears the fork inners were the same, they only changed the lower legs and hub.
Air cooled KDX went 83-86 but also in 86 the C2 model was born which was the powervalve, disc brake model.
They still had the early model in 86 with compliance as the C2 model was the US spec version.
It got compliance for 87 and continued in 88.
86 C2 was silver frame, 87 & 88 were green frames and came with battery holders and indicator tags etc. The 87/88 were known as 'D' models in Aust but were still 'C' models in the US
89 was the first of the watercooled KDX
I test rode the IT & KDX in 86 out the back of K & J, the KDX felt like the stronger motor so that's what I bought.
Don't remember having any trouble with the back brake back then, I will reconfirm this in 10 years time when I will hopefully get around to getting one of mine running again
Kawasakis were always an acquired taste and they didn't sell that many back then which is why you don't see that many these days (plus I have a few locked away
)
I think most brands & models have an unobtainable part of some sort, if you have money in your pocket you will be able to get most of what you need to keep anything running, it's only the showroom spec guys that have trouble trying to make them match the brochure.
Buy what ever colour matches your riding gear and spend the time to set it up to suit you.