1) Automatic choke is not closing. However, #2 below should override it.
2) Weak accelerator pump in the carb. Every time you advance the throttle, it should shoot gas into the primary venturis
3) Ignition problem. If the voltage drops to about 8 volts when cranking, an electronic module won't work. Same with points wired incorrectly. When cranking, the coil should see full voltage, and when running should see reduced voltage thru ballast resistor or resistor wire.
4) A combination of the above
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