a two - cycle engine block machined from a solid block of aluminum alloy has at least one cylinder passing through the block . an exhaust port extends from an outside surface of the block to an inside surface of the cylinder approximately midway between a top and a bottom of the cylinder . first and second fuel transfer ports are positioned on opposite sides of the cylinder and circumferentially displaced from the exhaust port . each of the fuel transfer ports have front side walls angularly oriented so as to direct fuel toward a sidewall of the cylinder opposite the exhaust port . each fuel transfer port has a top surface lying in a plane generally normal to an axis of the cylinder to deter upward flow of fuel into the outward flowing exhaust gases .