INTERNAL COMBUSTION ENGINE WITH IMPROVED FORCED AIR-COOLING

Disclosed is an internal combustion engine (110) having a forced air-cooling system comprising a fan (25) located outward from a centre line (Cl) of said engine (110) for directing a cooling air flow through an air passage (116) toward engine components to be cooled; a ring gear (24) and ring gear drive (27) co-operable with the ring gear (24) during starting of the engine (110); and a magneto rotor (23) rotated by a crankshaft (22) of the engine (110) wherein said ring gear (24) and said fan (25) are mounted to said magneto rotor (23), the ring gear (24) being mounted inward of and spaced from both the fan (25) and the air passage (116) and towards the centre line (Cl) of the engine (110). Se describe un motor de combustion interna (110) que tiene un sistema de enfriamiento de aire a presion que comprende un ventilador (25) localizado externo de una linea central (C1) del motor (110) para dirigir un flujo de aire de enfriamiento a traves de un paso de aire (116) hacia los componentes del motor que se van enfriar; una corona dentada (24) y un accionador de la corona dentada (27) co-operable con la corona dentada (24) durante el arranque del motor (110); y un rotor de magneto (23) girado por un ciguenal (22) del motor (110) en donde la corona dentada (24) y el ventilador (25) se montan al rotor de magneto (23), la corona dentada (24) esta montada dentro de y espaciada del ventilador (25) y del paso de aire (116) y hacia la linea central (C1) del motor (110).