Jim,
There is nothing special about the Bedford engine. If it has the military type Solex carb the choke (called a Zero Starter) has two positions, half out or full out. If really cold, set it at full out and when it fires move control to half out until it runs evenly, then push it off.. When hot you should not need the choke, one other thing, do not touch the throttle pedal while starting.
Richard