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Hello my name is ***** ***** I will assist you. The problem you have is that the carbs need a clean up and rebuilt as you have blocked jets that are not allowing the engine to idle. What you need to do is to remove the carbs and open their bowls. Then remove the needles, floats and all gaskets and soak the metal parts in carb cleaner for a couple of hours. Blow using compressed air making sure all the jets are open and clean. Reasselble everything back and it should run ok.
If you require further assistance let me know.
when you press on the choke button you are applying more fuel to the engine thus it looks like there is still fuel starvation and that means that there is still a jet that is clocked. Also you would need to set the idle air screws to 1 1/2 turns out from fully in position on each carb.
Ok at this stage start from the fuel tank, make sure that the pickup and vent are free, keep on checking the fuel line and bulb and any inline filters up till the engine. IF everything is free then the carbs need to go out againas there is still a blocked jet. You would need to get them cleaned via ultrasonic .