Follow the juice. Should have +12 volts on the "S" terminal on the ignition switch with the key in START. If not, likely a bad ignition switch since the push to choke feature triggers the primer solenoid so there is 12 volts up to the switch. If 12 volts at the "S" terminal, check for power at the starter solenoid (the terminal with the wire that comes from the "S" terminal on the ignition switch). No power with key in START says broken wire between switch and solenoid. If there is power to the solenoid, then the solenoid is likely bad. The neutral start switch is typically inside the shift control box. Wiggle the throttle/shifter while turning the key to START.