Abstract: A steering shaft is rotatably supported on a body by a housing, and a slide portion having a handlebar attachment portion at the top is attached to the steering shaft. The rotational movement of a handlebar around the central axis of the steering shaft is regulated by a rotation regulating mechanism, while the axial translation of the handlebar is allowed. The steering shaft is provided with a plurality of grooves. A lock mechanism provided in the slide portion inserts a locking bar into any one of the grooves to regulate the axial translation of the slide portion. Owing to the shape of a link portion and a cam groove constituting the lock mechanism, the locking bar is not pulled, out of the groove by operations other than a release operation using a release lever.

Abstract: A steering shaft is rotatably supported on a body by a housing, and a slide portion having a handlebar attachment portion at the top is attached to the steering shaft. The rotational movement of a handlebar around the central axis of the steering shaft is regulated by a rotation regulating mechanism, while the axial translation of the handlebar is allowed. The steering shaft is provided with a plurality of grooves. A lock mechanism provided in the slide portion inserts a locking bar into any one of the grooves to regulate the axial translation of the slide portion. Owing to the shape of a link portion and a cam groove constituting the lock mechanism, the locking bar is not pulled, out of the groove by operations other than a release operation using a release lever.

Abstract: A storage space can be defined above an engine hatch of a hull. A rear end portion of the hatch cover can have an opening into which a seat can be retracted into the storage space. A rear end portion of the seat can define part of the hatch cover when the seat is retracted within the storage space. A rail section can be disposed within the storage space. The seat can be movable between the inside and outside of the storage space by moving along the rail section in a fore to aft direction. Also, a support unit can engage with a bottom end of a guide groove to support the seat when the seat extends from the hatch cover.

Abstract: A small jet propulsion watercraft 10 is provided with side wall portions 14a and 14b formed on both the left and right sides of a stepping platform 13, within which water lock devices 36 and 37 are disposed, respectively. The water lock devices 36 and 37 are connected with connecting pipes 38a and 38b located below the stepping platform 13. An exhaust pipe 40 is connected to the front end of the water lock device 37, with the exhaust pipe 40 initially extending forward, extending upward and then rearward, and passing above the water lock device 37 within the side wall portion 14b, and with its end further extending downward to a position below the stepping platform 13. The water lock devices 36 and 37 are connected with small-diameter pipes 39a and 39b at a portion lower than where the connecting pipes 38a and 38b are joined to the water lock devices 36 and 37.

Abstract: A storage space can be defined above an engine hatch of a hull. A rear end portion of the hatch cover can have an opening into which a seat can be retracted into the storage space. A rear end portion of the seat can define part of the hatch cover when the seat is retracted within the storage space. A rail section can be disposed within the storage space. The seat can be movable between the inside and outside of the storage space by moving along the rail section in a fore to aft direction. Also, a support unit can engage with a bottom end of a guide groove to support the seat when the seat extends from the hatch cover.

Abstract: A small jet propulsion watercraft 10 is provided with side wall portions 14a and 14b formed on both the left and right sides of a stepping platform 13, within which water lock devices 36 and 37 are disposed, respectively. The water lock devices 36 and 37 are connected with connecting pipes 38a and 38b located below the stepping platform 13. An exhaust pipe 40 is connected to the front end of the water lock device 37, with the exhaust pipe 40 initially extending forward, extending upward and then rearward, and passing above the water lock device 37 within the side wall portion 14b, and with its end further extending downward to a position below the stepping platform 13. The water lock devices 36 and 37 are connected with small-diameter pipes 39a and 39b at a portion lower than where the connecting pipes 38a and 38b are joined to the water lock devices 36 and 37.

Abstract: A watercraft propelled with tread force includes a buoyant hull. A seat unit is mounted on the hull. A propulsion device is arranged to propel the hull. A manually operated apparatus is arranged to power the propulsion device. The manually operated apparatus is disposed in front of the seat unit and comprises a slide mechanism that includes a pair of pedals slideable with tread force alternately given to each one of the pedals by a rider in the seat unit.

Abstract: An improved mounting arrangement for a twin jet propulsion unit eases the assembly of the system, as well as enhances the performance of the system. A unified mounting plate supports the propulsion units and offer a degree of adjustability which permits the propulsion units to be precisely aligned with desired longitudinal axes defined by the watercraft hull, as well as with each other. In addition, the rigidity provided by the mounting plates tends to hold the propulsion units, which cantilever rearward from the mounting plates, in the desired positions. As a result, additional support structure and fasteners can be removed from between the jet propulsion units and they can be spaced closer together so as to generally match a desired spacing between the inlet openings of the associated intake ducts.

Abstract: A number of embodiments of jet propelled watercrafts having reverse thrust mechanisms and wherein an indicator is provided for indicating to following watercraft when the watercraft is being rapidly braked or rapidly turned. The watercraft has adjacent throttle and shift lever controls and various control lever positions are disclosed for facilitating ease of operation and compact construction.

Abstract: A number of embodiments of jet propelled watercrafts having reverse thrust mechanisms and wherein an indicator is provided for indicating to following watercraft when the watercraft is being rapidly braked or rapidly turned. The watercraft has adjacent throttle and shift lever controls and various control lever positions are disclosed for facilitating ease of operation and compact construction.

Abstract: A number of embodiments of jet propelled watercraft wherein the jet propulsion unit is positioned in a recess on the under side of the hull. A part of the water inlet opening of the jet propulsion unit is removable from above so as to permit clean-out of the jet propulsion unit water inlet and impeller when still mounted in the hull. Various locations and access openings are disclosed. In addition, embodiments of safety arrangements for disabling the prime mover when the removable part is removed for servicing are described.

Abstract: Several embodiments of jet propelled watercraft wherein the jet propulsion unit has a water inlet opening forming portion that is movable between a driving position in which water may be drawn through the opening and a service position wherein the opening may be accessed for servicing. A screen is fixed relative to the water inlet opening of the jet propulsion unit and cooperates with a corresponding opening in the hull to force all water entering the water inlet opening to pass through the screen when the jet propulsion unit is in its driving position. However, the screen is spaced from the water inlet opening forming portion of the jet propulsion unit in its service position so as to permit servicing of the jet propulsion unit water inlet opening without removal of the screen. A variety of interlock arrangements are disclosed so as to preclude driving of the jet propulsion unit when it is not in its driving position.

Abstract: A jet propulsion for watercraft having a screen that extends across the water inlet opening of the jet propulsion unit for precluding foreign articles from entering the jet propulsion unit. The jet propulsion unit water inlet opening is supported for movement between a lowered driving position and an elevated service position. The screen is held in its closed position when the jet propulsion unit is in its driving position and may be pivoted to an open position when the jet propulsion unit is elevated.

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 jet propelled watercraft that is pivotal about a transversely extending horizontally disposed axis for raising the jet propulsion unit from the body of water in which it is operating and also for trim adjustment of the jet propulsion unit. A trim plate is affixed to the under side of the jet propulsion unit and spans a pair of side walls defining the tunnel opening in which the jet propulsion unit is received for providing trim adjustment of the watercraft upon trim movement of the jet propulsion unit. Sealing arrangements are disclosed for providing sealing around the jet propulsion unit water inlet opening during the trim adjustment.

Abstract: A water jet propelled watercraft having a hull defining a downwardly facing water inlet opening and a jet propulsion unit contained within the hull and having a water inlet opening portion through which water is drawn, an impeller portion containing an impeller for drawing the water and a discharge nozzle portion through which the water pumped by the impeller is discharged for powering the watercraft. The jet propulsion unit is supported for pivotal movement within the hull about a transversely extending horizontal axis. The water inlet opening of the jet propulsion unit water inlet portion and a corresponding portion of the hull water inlet opening are defined by mating flanges that lie in a plane that contains the horizontal pivotal axis to minimize sealing pressure variations on the seal therebetween.

Abstract: A watercraft propelled by a jet propulsion unit that is positioned within a tunnel in the underside of the watercraft. The jet propulsion unit is supported for pivotal movement about a horizontally extending transverse pivot access and the housing of the jet propulsion unit is divided into separate components so that the water inlet portion may be rotated to an upwardly facing service position without rotation of the discharge nozzle, steering nozzle, or reverse thrust buckets associated therewith. As a result, an extremely rigid support is accomplished which nevertheless permits ease of servicing.