If it don't work normally on its own something is wrong. I am seeing all kinds of crazy suggestions. DO NOT under any circumstances make any holes bigger or modify anything. There is something dirty inside the carb not allowing the proper amount of fuel to pass. Also if you need a new carb its $48.75
OEM CARB IS 89.99 http://www.ebay.com/itm/NEW-Honda-GX...item19e84aece1
Also are you running it without air filter? Hondas require the choke from the air filter as pat of their normal running to get that extra little bit of gas.