US 5775271 A abstract this invention concerns an engine with electric ignition for model cars a cooling fan is installed in front of the finned cylinder which is supported in a case the fan is driven by a toothed belt application_number US 75974696 A description with reference to the above drawing the engine is characterised by a forced air cooling system consisting of an axial fan 1 with horizontal axis positioned in front of the finned cylinder 2 and supported in a case 3 the case 3 consists in fact of a circular bottom cover 3a having a grid as air intake and connected to a shaped mouthpiece 3b which conveys the airflow generated by the fan 1 against the fins of the cylinder 2 the case 3 is also fixed to the cylinder 2 by means of a set of three screws engaging in the blind holes 2a on the base and sides of the cylinder 2 body the fan 1 hub being provided with a toothed collar 1a with which a geared belt 4 engages and which also engages a geared pulley 5 splined on the drive shaft 6 in particular said geared belt 4 passes into the cover 3a in which the fan 1 is in operating position through the notch 3c on the bottom wall of the cover 3a the above pulley 5 is provided with a flange 5a on the back of which the magnet is supported the same being designed to.