Abstract: A marine jet propulsion system for a boat or the like comprises a power plant for rotating a drive shaft. A gear system is connected to the drive shaft and is configured to engage and rotate an impeller shaft. An impeller mounted to the impeller shaft is enclosed within a housing having a water inlet opening and a jet stream exit opening. The gear system includes a pinion gear connected to the drive shaft and engaging a pair of opposed ring gears, the ring gears being thus rotatable by the pinion gear in opposite directions. A clutch system is provided for selectively causing the impeller shaft to alternatively be engaged by one or the other of the ring gears and thereby selectively rotating the impeller in opposite directions.

Abstract: An internal combustion engine comprising an engine block including a combustion chamber, a fuel vapor separator, a fuel supply mechanism for introducing fuel to the combustion chamber, a conduit communicating between the fuel vapor separator and the fuel supply mechanism for introducing fuel, and a cooling jacket for cooling the fuel vapor separator.

Abstract: Disclosed herein is apparatus for positioning a sensor relative to a rotatable timing ring included on an internal combustion engine, which apparatus includes a sensor, a structure for adjustably positioning the sensor on the internal combustion engine and relative to the timing ring, which structure is movable relative to the sensor and to the timing ring, and additional structure for fixing the sensor in adjusted position on the internal combustion engine.