Patent ID: 7950355

Claim:
An air-cooled engine comprising: a rotary drive shaft; a flywheel mounted on the rotary drive shaft; a cooling fan assembly provided on the flywheel and drivingly coupled with the rotary drive shaft for inducing a stream of cooling air; a screen member fitted to the flywheel so as to cover an axial end face of the cooling fan assembly on a suction side and rotable with the cooling fan assembly; a fan casing covering the cooling fan assembly and defining a path of flow of the stream of cooling air, the fan casing having an air intake opening defined therein for introducing the stream of cooling air to the cooling fan assembly and the screen member; and a cutter formed in the screen member at one of an outer peripheral portion of the screen member and a location operatively adjacent the outer peripheral portion of the screen member so as to protrude axially close to an inner surface of the fan casing at a position downstream of the cooling air from the air intake opening to enable a cutting operation by the cutter.