Abstract: A watercraft having a bow rider-type configuration wherein the forwardmost riders' seats are canted slightly inwardly toward the longitudinal centerline of the watercraft so as to permit adequate leg room without overly extending the length of the hull. A pass-through connects the bow riders' portion to a main seating portion in which a bench-type seat that is adapted to accommodate three riders is provided. The pass-through between the seating portions is not significantly wider than one of the seats. Various arrangements for a storage compartment and engine and jet pump clean-out and flushing access are also provided.

Abstract: A watercraft having a bow rider-type configuration wherein the forwardmost riders' seats are canted slightly inwardly toward the longitudinal centerline of the watercraft so as to permit adequate leg room without overly extending the length of the hull. A pass-through connects the bow riders' portion to a main seating portion in which a bench-type seat that is adapted to accommodate three riders is provided. The pass-through between the seating portions is not significantly wider than one of the seats. Various arrangements for a storage compartment and engine and jet pump clean-out and flushing access are also provided.

Abstract: A small jet propelled watercraft having a hull undersurface provided with a plurality of stripes and a step at the rear end thereof to reduce porpoising without increasing drag. The watercraft is propelled by a jet propulsion unit having a discharge nozzle which is capable of trim adjustment and which is controlled by a twist grip control mounted on its steering handlebar.

Abstract: A jet propelled watercraft having a discharge nozzle that can be adjusted for trim and an electrically operated trim condition indicator is provided for giving the rider the indication of the actual trim condition of the watercraft. In addition, an automatic trim control mechanism is provided that permits the operator to set the desired trim at varying watercraft speeds and the trim will be automatically set when those speeds are reached.

Abstract: A watercraft having a jet propulsion unit that is supported at least in part within a tunnel on the under side of the hull and which is movable between a driving position and a service position. The control for operating the jet propulsion unit to move it between its positions is disposed within the tunnel and accessible through a service opening so that it cannot be accidentally actuated.

Abstract: Several embodiments of water jet propulsion units that are manually moveable between a downwardly facing in-the-water position and a raised, out-of-the water position. The movement includes pivotal movement about a transversely extending horizontal pivot axis and rotation about a longitudinally extending rotational axis. Latching apparatus are disclosed for holding the jet propulsion unit in at least one of its positions and in one embodiment the latching apparatus is effective to hold the jet propulsion unit in each position.

Abstract: A jet propulsion unit for powering a watercraft that is contained within a tunnel on the underside of the hull of the watercraft. The jet propulsion unit is rotatable about a longitudinally extending axis to rotate its water inlet opening from a downwardly facing position to a raised, out of the water storage and service position The drive for rotating the jet propulsion unit is positioned forwardly of the tunnel and out of the body of water in which the watercraft is operating.

Abstract: Several embodiments of jet propelled watercraft that incorporate an arrangement for hydraulically pivoting the jet propulsion unit between a normal position and a raised position and for rotating the water inlet portion of the jet propulsion unit from a downwardly facing direction to an upwardly facing service position. Hydraulic motors are employed for achieving both motions and are actuated through a common circuit for achieving sequential movement. In one embodiment, the rotary hydraulic motor is formed integrally within portions of the housing of the jet propulsion unit to provide a compact assembly.

Abstract: A jet propelled boat having a tunnel at its rear end in which a jet propulsion unit is movably supported. The support for the jet propulsion unit is readily detachable so that the jet propulsion unit may be easily removed from the tunnel. The tunnel is closed at its rear end by a transom of the boat in which a small opening is formed through which the jet propulsion unit may be removed.

Abstract: A V bottom hull watercraft powered by a pair of jet propulsion units that are supported for pivotal movement about horizontally disposed pivot axes and rotary movement about a longitudinal pivot axis to rotate the water inlet openings and elevate them from a downwardly facing normal operating position and an upwardly facing service position. The water inlet openings are disposed so that they extend parallel to the sides of the V bottom. Steering nozzles are supported for pivotal movement at the discharge ends of the jet propulsion units and pivot about vertically extending axes that are not perpendicular to the water inlet openings so that no vertical thrust will be exerted on the watercraft hull when the steering nozzles are pivoted to effect steering.

Abstract: A throttle valve synchronizing arrangement for the induction system of a V type engine wherein the throttle valves associated with each cylinder bank rotate in common vertical planes but wherein these planes are not parallel or collinear with each other and wherein the throttle valve shafts are staggered. The throttle valve of each bank are synchronized with each other by a linkage system and the banks are synchronized with respect to each other by connection to an intermediate shaft that is disposed at a greater angle to the shafts of the throttle valves of the banks than the angle between the throttle valves of the banks.

Abstract: An improved shift assist mechanism for a marine propulsion transmission including a shift assist element that is pivotally supported and which defines a slot that receives a member of the linkage that connects the shift operator with the shift control element. Movement of the shift mechanism from either a forward drive position or a reverse drive condition effects pivotal movement of this element and this pivotal movement is employed to actuate a shift assist mechanism that reduces engine speed to assist in shifting.

Abstract: A synchronizing mechanism for synchronizing a plurality of throttle valves that employs a single coupling member that couples slave butterfly valves to a directly operated butterfly valve for synchronizing all of the butterfly valves simultaneously.

Abstract: Several embodiments of arrangements for transmitting driving thrusts from the bearing carrier of a lower unit to the lower unit housing at the rear end of the bearing carrier so as to permit a compact and streamlined relationship while affording high thrust transfer areas.

Abstract: A tilt and trim operating mechanism for a marine outboard drive including a simplified electrical arrangement for operating a reversible electric motor from a DC power source. The circuitry includes four relay switches operated in such a manner as to simplify the cost of the components since four double contact relays can be employed rather than two, three contact relays.

Abstract: A throttle valve synchronizing mechanism for a plurality of throttle valves interconnected by a linkage system. The synchronizing system includes a pair of pivotally supported levers one of which is fixed for rotation with one of the throttle valve shafts and the other of which is connected to the linkage system. A locking screw arrangement holds the levers in adjusted positions and the locking screw rotates about an axis that is non-parallel to the axes of the levers.

Abstract: Two embodments of induction devices for V-type engines wherein a compact configuration is achieved by having the inlet for the induction device disposed between the area defined by the associated induction devices of the engine.