Awesome paint on that! I’m biased as my first MTB was a 1989 tri-fluro MBK!
I suggest you ride and enjoy it!
If that ended up in East London it would get a its gears robbed, then a short stem, narrow riser bars and a front rack/basket contraption added...
Visually i’d ditch the Saddle a get something more period correct. It would look and ride awesome with a short stem and some motorcross style risers people are fitting to cruisers and old MTB’s because our backs are packing up.
@Imlach would be able to advise!
Don’t touch the paint. That IS late 80s heaven to me! With Mountain LX groupset that bike is from 1989 as they only produced/sold it for one year before rapidfire landed and Deore LX replaced it.