With the choke working properly and a clean carb, it should not be necessary to pump the throttle. Hold the pedal slightly open, pull the choke knob out all the way, and crank the engine until it fires. Push the choke knob in partway to avoid flooding and let the fast idle cam attached to the choke linkage increase the idle speed. Within a minute or so the engine should warm up enough to open the choke all the way.
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!