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An air‐cooled internal combustion engine comprising a plurality of cylinders arranged in series, a cooling air jacket enclosing each cylinder and having inlet and outlet openings for permitting cooling air to be forced around its respective cylinder, the inlet opening of each of said jackets being in the form of a slot which decreases in width from the valve end of the cylinder toward the crank end thereof, an air receiver common to the series of cylinders and their jackets, bounded at least partly by those portions of the jackets in which their inlet openings are located, so as to maintain direct communication for cooling air from said receiver to the respective jackets, and a blower for delivering cooling air into said receiver.