Small engine catalyst to small utility engines used in lawn and garden equipment and other commercial or industrial equipment, the Tier 2 emission regulations are very stringent for HC emissions, at this stage, the handheld engines are almost two-stroke engines, because they are small, they do not have enough muffler volume to be equipped with larger catalysts, LICAT small-engine catalysts are designed to significantly reduce harmful hydrocarbon and carbon monoxide emissions from small, two- and four-stroke gasoline engines.