Small engines are compact machines that convert fuel into mechanical energy. They are commonly found in various equipment, such as lawn mowers, chainsaws, and generators. These engines typically have a displacement of less than 25 horsepower and can run on gasoline, diesel, or alternative fuels. These engines operate using a simple four-stroke or two-stroke cycle, which involves intake, compression, power, and exhaust phases. Small engines are essential for many outdoor and industrial tasks, providing power for tools and machinery in both residential and commercial settings. Their efficiency and portability make them popular choices for many users.