An outboard motor includes: an engine cover having an upper cover and a lower cover which form an engine room and which can be separated from each other vertically; a ventilation fan for ventilating the engine room; and a fan cover which covers the ventilation fan, the engine cover is configured so that the upper cover is able to be attached to and detached from the lower cover and the lower cover is fixed to an outboard motor main body including an engine, the lower cover has an external air inlet through which to take air into the engine room and a discharge outlet through which to discharge air from the engine room, the fan cover has an air outlet through which to cause air that is sent from the ventilation fan to flow out, and the discharge outlet is connected to the air outlet.

The present invention is a system for air supply to the engine of a motor float comprising a bottom part and an upper part of the body defining the inner space of the float, in which a combustion engine is arranged, wherein the upper part of the body is in its front part provided with an air supply, characterized in that the combustion engine is arranged in the engine compartment and separated from the rest of the inner space of the float by means of a partition provided with a suction opening in its front part, wherein to provide the circulation of air in the inner space of the float a sealing rib extends from the front part of the partition towards the tip of the float, separating the air supply and suction opening from one another, wherein at least one rear pump for sucking the leaking water is arranged in the rear part of the inner space of the float. The main object of the invention is thus to use the interspace of the float to provide separation of water and air, when eventual separated water may be sucked away by a pump operating on any principle (electric, vacuum, etc.).

A jet propelled watercraft includes a watercraft body, an engine in the watercraft body, a jet pump configured to generate a jet thrust by a driving force of the engine, an intake pipe configured to supply air to the engine, an air intake box, and a filter. The air intake box includes a connecting port connected to the intake pipe and an inlet configured to take in ambient air. The filter is disposed in a space in an internal space of the air intake box. The filter divides the space into a lower region and an upper region. The lower region is connected to the inlet and the upper region is located higher than the lower region and connected to the connecting port. The filter is configured to clean air taken into the internal space from the inlet and directed to the connecting port.