There is an adjustment on the thermal spring (rich-lean). The second it fires, and you get intake manifold vacuum, the "choke pull-off" (round dashpot at top) should pop it open slightly so it doesn't die rich. Those often fail. Remove the rubber tube, push in the stem, block the vacuum port w/ your finger and see if the stem stays in. If not, the rubber diaphragm is torn. Don't ever spray carb cleaner around it.
. And the rubber diaphram is torn... Should this have been replaced with a carb rebuild or is it a seperate part? Anything else I can check now? I have spark plugs/air filter/and pcv valve coming.. Maybe I should start another thread..