​Flushing a motorcycle gas tank clears out old fuel, varnish, water, rust flakes, and shop debris so the carburetor or injectors stop clogging and the fuel pump lives longer. The goal is not just to “rinse” the tank, but to dislodge, dissolve, and evacuate contaminants without harming paint or internal coatings, then dry the tank so fresh corrosion doesn’t start.