Is the chock on or off?
I've found. out if the chock is all the way on but when your taking it off it dies, due to the idle screw isn't set right.
If you suck on the vacuum fuel line does fuel flow constant? Be sure 100% there is no vacuum leaks, I've worked on a carb scooter and it had a lot of issues if there was any air leaks.
Valves ok too?
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