im sure its been ridden hard.  but i planned on taking it down to the frame, sending the suspension off to have it re-done as im sure it's sprung for a 115lb japanese male.  complete rebuild.  
i've given it some thought, and im giving serious consideration into doing a CR500AF.  i figure if im going to be building something from the frame up, i might as well do something worth doing.  i can still get US postal service here which means i can get a 500 motor from the US.  you cant get those in japan.  but what i can get dirt cheap here is a blown up crf250.  i have a friend who tigs.  it makes perfect sense.