I'd pull the float bowl off and check for dirt in the holes in the centre bolt. You might want to clean the gas tank out. Wash out with hot soapy water and then dry it out by stuffing paper towel in there and move around with a long screwdriver. Once installed get some Methyl Hydrate (Isopropanol) put an ounce in the tank and fill it up with Premium gas (always use premium in your small engine, less or no E-85)