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When it's really cold, it might prefer a couple of pumps before cranking, but Goopie has it right. It's not necessary to go all the way to the floor. Anything past 1/8 throttle should set the choke plate into its cold-start position.
If the engine idles roughly after it fires up, you might have to adjust the idle cam and/or the choke position to tweak it to the ideal mixture.
If it's warm out, you might want to crack the throttle open a bit while you crank to avoid flooding the engine.
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