Very nice. It is a Miyata for the Japanese market, no Koga. Some of the graphics are typical Japanese (with sometimes interesting English). Not rarely the early 90s Miyata Jp mountainbikes came in very flamboyant loud paintschemes too, but this example looks relatively distinctive. Downhill champ Greg Herbold was sponsored by Miyata. He mainly raced Miyatas for the US market. Some of his frames share the graffiti like on your frame. Nice score.
For the European market Koga-Miyata had a model using an almost identical frame: the 1991 TerraRunner Carbolite. The kind of BB-yoke, the OS headtube and a couple more details explain your frame is a 1991 model.
The Koga has same lugs and tail, but carbon tubing in front triangle. The TerraRunner also has the tiny glitter particles in the paint.
Another variation was this US Miyata with aluminium front and rear triangle:http://www.retrobike.co.uk/wiki/Miyata_ ... re_edition
Carbon front, aluminium tail and carbon front, carbon tail frames existed too.
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