Ok, now we need to go into the carb, unscrew the big nut on top of the carb and pull out the throttle assembly, disconnect the fuel line from the carb and remove the carb from the motor. Put it on a bench and remove the fuel bowl from the carb its held on with 2 screws,inside you will find the float and a brass coloured prong,this prong is held in with a pin, very gently remove the prong and there is a small black needle hanging from the prong. Do not lose any pieces as they are all small. When you get this far let me know.Meantime go out and buy a small spray can of carb cleaner.