Eagleone

My ATV will not start. The ATV sat for a couple of years so the carb and gas tanked were pretty gumed up. I rebuilt the carb, replaced the battery and choke cable and cleaned out the tank. The ATV still acts like is not getting any gas. If you put a couple drops of gas on the spark plug and reinsert it then it will start for a second. As soon as it burns that gas it sputters out. This ATV has been hard to start ever since I bought it new. Does anybody have any ideas?