A personal watercraft having a compact engine arrangement for driving a propulsion device such as a jet pump positioned to the rear of and on the underside of the watercraft. The engine is disposed so that its cylinder block is at an angle to a vertical plane, with the exhaust manifold being positioned...http://www.google.es/patents/US5647779?utm_source=gb-gplus-sharePatente US5647779 - Manifold and water trap system for marine engine
