Try the following simple test: Pump the throttle to the floor 2x and then crank; as soon as it fires, try pumping the accelerator about 1/4 to the floor every 1 second or so; that will pump added gas into the carb via the accelerator pump (which is what you saw squirting gas in to the carb throat), and simulate the choke action in that way. If the lack of choke is the problem, then this will probably, keep it running 'til it warms up; if you get your technique right.