if the carbs need cleaned take the bowl off the bottom and the slide out of the top, take out the jets(should be 2 per carb and brass in color) and soak everything with carb cleaner overnight. You can use an old tooth brush and scrub what you can get to. Blow some air through the jets and make sure they aren't clogged and put it all back together. Don't mess with any adjustment screws on the out side. Hope this helps