well dear its very common that carb gets choke when wont supply any fuel for a long period,,,,,,,,,,,in your case the float valve is blocked and it cant allow fuel to enter in the bowl,,,,,,,,,you see the pic,,,,,,,,note that 2 inch pipe of gas which i connected with the original fuel pipe of carb,,,,,,,i post that pic a long time before but no one has spoted this thing,,,,,,,,,,,i add petrol with small keep throw that pipe,,,,,,,,transparent pipe allow me to see whether fuel is going inside the carb or not ,,,,,,,,and once the engine starts you can see the fuel level lowering down throw that small pipe,,,,,,,,,,,try this ,,,,,,i am sure your carb is not assepting any fuel,,,,,,,,,,,,