Carb rebuild won't start now.

Early manual says; "[s]et throttle four or five notches from top and turn on ignition switch. Pull choke out and hold for an instant ONLY [emphasis in the service manual], while the starter cranks the engine. Cold weather will require holding the choke slightly longer." Later manuals say; “turn the ignition switch on, and partially open the throttle. Hold the clutch pedal down, and press the starter button. If the engine does not start promptly, pull the choke button out for several engine revolutions. Use the choke as needed until the engine runs smoothly.” If it doesn’t start the first time, don’t use the choke the second or third time. Maybe choke some the fourth time. Gotta go easy on the choke.