If that really is an '80 model it's years behind the YZ250G... it still has the steel swing arm and just looks pre-historic.
most jap enduro bikes lagged way behind their MX cousins, serious enduro riders all rode Husky, KTM, Maico back then for good reason. many others rode modified MX'ers but the gearbox ration were too close, power too snappy, suspension too hard. i even remember a few rego'd CR500's getting around too