Sadiq,
If catalogs are to be believed, then I think the only difference in the frameset is that '85s had derailleur cables routed on top of the bb and the '86s had them routed below the bb. I have an '86 at home for reference if you have any more specific questions re that year.
Equipment differences were minimal, as well. See:
http://miyatabicyclecatalogs.blogspot.com/
Best,
Kerrigan R. Bennett Pleasant Hill, CA USA Worked in a Berkeley, CA shop that sold Miyatas "back in the day."
Archive-URL: http://search.bikelist.org/
Anyone kknow the difference between the 1985 and 1986 Team Miyata frame?
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Sadiq Gill
Richmond, VA