you were saying there's no number on the main jet .. It's supposed to have the number stamped on the face (or is it ass??) of the jet ... It's on the same plane suface that the screw driver slot is cut into.. You can read it by turning the carb upside down. Maybe someone dicked with it and the bike can't run with the stock airbox, or its a wrong jet..
my memory of the details of this saga is fading .. if this jet thing has already been determined forget it.