Bessemer built the Gaso-Kero engine between 1913 and 1925. Kerosene was the preferred fuel of the period, producing more power and being less expensive than gasoline. The engine will run, however, on a multitude of fuels ranging from kerosene to gasoline and even alcohol.

The Gaso-Kero engines were built in 2, 4, 6, 8, and 10 horsepower sizes. As with the other Bessemer engines, two cycle design was followed in this series. The Gaso-Kero engines were furnished complete with cooling tank and fuel tank. Although these engines were well built, their weight was far less than comparable four-cycle designs of the same period. The 10 horsepower model only weighed 900 pounds -- 90 pounds per horsepower in a time when 250 pounds per horsepower was common practice.