If your using an external gas tank, I would highly suggest getting a FRAM inline fuel filter from wal mart. They run about $2.50, and they do catch a good bit of dirt. Tearing a carb down and cleaning/rebuilding is easy if you have an air compressor. Take a picture before each step of the tear down and save in case you need the reference. On my motor, I tear them down and clean them out every 3 - 4 months. Think on the plus side, a carb clean is almost free and much easier than a injector going bad