Check fuel pump delivery for adequate flow. If when choke enrichment is applied and it runs, then dies when choke is off, fuel flow is inadequate and needs choke enrichment to compensate. Also, if engine dies or chokes when increasing rpms, this will be a symptom of too little fuel. Check fuel flow at pump, then, if flow is good, check for carb blockage, unscrew the jet and inspect, check the operation of the solenoid at the bottom of the bowl, it has a wire attached to it. Trace that wire to where it plugs in, unplug it and touch it to the positive pole of the battery, it should retract. If not you need a new solenoid that has the job of metering in gas to the inner bowl below the jet assembly.
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