No power in neutral light or ignition switch
 

Fairly sure the ignition switch also turns the lights on and off, so I think you are getting power to and from the ignition switch. Try to get hold of the wiring diagram, and trace the neutral light circuit back to the ignition switch. There is a lock-out that prevents the starter working unless the neutral light is on, which makes this circuit very complex. You would be better posting in the Yamaha section by the way.