Air-cooled engines are Employed in bikes and scooters. In air-cooled engines, the cylinder barrels are frequently separate and are equipped with steel fins which give a significant radiating surface area to enhance the amount of cooling. The brush cutter will not be a self-propelling device, nor does it have wheels. https://www.yantracart.com/gardening-tools/grass-cutting-machine-and-brush-cutters/