Put my halogen work light, believe it might be 500 watt, facing the carburetor and manifold for about an hour or 2 in my pole barn. Went out turned on the fuel, turned the engine over once or twice 1/4 throttle, turned the key on and hit the starter again and she filed right up no choke required.

If my gasoline isn't too old. On my 9n I turn the key on and push the button. If the gas is old. I have to choke it a lot.

Hi wsmm,
If you are still taking suggestions, here is one.
When your 2n is all warmed up and running, grab a tape measure, set throttle to 1/8 to 1/4 ish, then pull the choke out to the farthest spot it will stay running, and measure knob to dash. On my 8n its about 7/8 inch.
Then make a spacer at that lenght, like this rubber hose

Making this "jig" or " go, no go gauge"
Is attemping to find, and repeat where the proper mixture is, as found on the choke rod.

Hopefully this tool will help during the moment after the first cylinder fires. So when cold, with the spacer on, the idea is to give full choke, at your timing and discretion, to get it to fire, then hands off the choke, as it starts.

Wsmm,You can try a trick I use to get a N started in cold weather.

#1 be sure battery is fully charged up.

#2 depress or block clutch petal down transmission in neutral when cranking over.

#3 Be sure you have no gas leaks.

#4 Heat intake manifold with a good propane torch (not carburetor) moving torch over intake manifold back and forth

for 2-3 minutes until it is good and warm.

#5 quickly turn on fuel,throttle 1/4 to 1/2 way pull choke .turn engine over 2 times,push in choke ,turn on ignition switch and start.

#6 Once started be ready to feather the choke if needed to stay running until it is warmed up

This always works fo me unless something else is wrong.

My father used to heat a pot of water to boiling and pour that over the manifold on his Ferguson TO30 and it would start at -20. Gasoline does not ignite with the spark, gasoline vapor does.

Old tractors have a personality. You learn what yours likes. How much gas? How much choke? etc. And of course it's 70 years old and could have a dozen problems. Mine likes no gas and full choke. Then it would pop. Then it would almost starts. Then I would give it a tiny bit of gas and it would go. Loved the starter fluid too. In the summer things were different. Keeping it well tuned is important too. And charged. Bright and tight...