Remove the carb, then the float bowl at the bottom of the carb then clean the carb with spray carb cleaner. Spray into each and every drill hole and jet you can find. Use goggles so you don't accidently get cleaner in your eyes. Please, rate my answer, thanks. Reset the air and throttle screws, one and one half turns outward from a lightly seated position. Please, rate my answer. Thanks.