👉 Underboard is a term used in the automotive industry to describe a type of gas engine that operates by using compressed air to generate mechanical power. In other words, it is an internal combustion engine where the fuel (gasoline or diesel) is injected into a cylinder with a piston and ignited by a spark plug. The underboard engine is typically found in smaller vehicles such as motorcycles, scooters, and bicycles, as they are compact and require less space than larger engines. The cylinders of the under
