Choke the carb and turn it over for a little while,stop and pull the plugs, they should smell like gas or be wet. If not, I would shut the petcock off, drain the float bowls and inspect whats coming out. Turn the petcock on leaving the float bowls drain open and check the flow. I would either spike the gas tank with Sea Foam or drop the bowls and add Sea Foam to the bowls, reinstall and leave for a day or two to see if it will loosen up anything.
