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I'm not sure a 40 watt bulb would be enough unless you wrapped the carb with something and put the bulb inside. That might work.
Is the choke really for the cold combustion chamber? I thought the choke is necessary because cold fuel is very unwilling to atomize and when a carbureted engine is "warmed up" and runs good, it is because the temp of the carb (and the fuel inside it) is warm enough from easy atomization to occur. But I could be wrong.
Oil pan 4: what do you warm up with the heat gun, the carb? And no choke is necessary once you do this? The answer to that will solve the "what the choke is really for" question above.
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