Full choke- - - -crank until the engine fires without stepping on the gas pedal, then push the choke knob partway in as soon as the engine starts running. Most people don't use enough choke with a cold engine, or they leave it closed too long and flood. After a few starts you'll get a feel for how much to release the choke to get a smooth warmup. Within a minute or two (with a good heat riser) the engine should idle smoothly with little or no choke. An engine that starts cold with no choke is running WAY too rich!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!