I'v heard of people boring out their carbs. If your carb opening is thick, then you can do this. All you need is a dremel with a grinding bit and polishing compund to make it as smooth as a baby's butt. You only bore the top half of the carb which is before the rotary or slide valve and make it into a cone shape. Be carful not to hit the needles and what nots inside the carb. Im shure this will give you a noticable boost but don't over do it cause the walls will be to thin. The best part is its absolutly free if you own a dremel or other rotary tool.