The choke is there to be used all the times! instead when the engine is warm...
Also, I believe you have cracked fuel pipe: the one from the fuel tank to the carb.
Either it's cracked and letting air getting in OR the hose clamps aren't tight enough and are letting air inside.
This WILL make just that starting problem!
I had it and some of you out there also have or had it before!
Vando
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