Is it fully closing when you have it mounted and the cable/linkage connected?
There is an internal choke circuit inside the carb. You should be able to find a fuel circuit map online. It will show where the fuel flows under every condition, including choke starting. Could be a clogged passage, incorrect gasket between the bowl and body, warped body where it seals to the bowl.
When it fails a choke assisted start, does it drip a few drops of gas out the air in of the carb?
It should. If it is not dripping, that is a sign the choke circuit is not working.
If it is dripping, that is a sign of another problem, like lack of, or weak spark, worn plugs, etc. Does it ever fire the instant you let off the starter? Another sign of weak spark, weak battery, small cables, dragging starter.
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