Abstract: A drive shaft supporting structure for a small boat is provided which permits simplification of a hull and for which manufacturing productivity is increased. The drive shaft supporting structure includes a shaft-supporting member for rotatably supporting a drive shaft inside of a hull, and an elongate cylindrical sleeve. The cylindrical sleeve is arranged between the shaft-supporting member and a hull opening which permits penetration of the drive shaft through the hull. The drive shaft supporting structure is configured in such a manner that a front end portion of the cylindrical sleeve is connected to the shaft-supporting member and a rear end portion of the cylindrical sleeve is connected to the hull opening.

Abstract: A drive shaft supporting structure for a small boat is provided which permits simplification of a hull and for which manufacturing productivity is increased. The drive shaft supporting structure includes a shaft-supporting member for rotatably supporting a drive shaft inside of a hull, and an elongate cylindrical sleeve. The cylindrical sleeve is arranged between the shaft-supporting member and a hull opening which permits penetration of the drive shaft through the hull. The drive shaft supporting structure is configured in such a manner that a front end portion of the cylindrical sleeve is connected to the shaft-supporting member and a rear end portion of the cylindrical sleeve is connected to the hull opening.

Abstract: A steering device for a personal watercraft includes a handle holder fitted to a watercraft body. A steering shaft passes through the handle holder, and a handle is fitted to the upper end of the steering shaft. The steering shaft is provided with a groove, and a holding member is provided in the handle holder and is fitted into the groove. Accordingly, movement of the steering shaft in the axial direction is restricted. A flange or the groove has a shape such that its width can be reduced. When the holding member is fitted by setting the width to a small size, and taking dimensional variations into account, the chattering between the flange or the groove and the holding member can be reduced. In view of this, the steering shaft is provided with the flange or the groove, and the holding member provided in the handle holder is fitted to the flange or the groove, so that movement of the steering shaft in the axial direction can be restrained.

Abstract: To provide a jet propulsion watercraft that allows a step, a vent hole, and the like to be easily provided on a bottom surface thereof. A ride plate of a jet propulsion watercraft is a member, which is formed into a substantially rectangular shape in compliance to an opening in a bottom surface of a hull bottom. The ride plate is provided with a lock tab at a front edge thereof, and bolt holes are made in a right and left end portion thereof. The ride plate is further provided with a step portion that forms part of a general bottom surface, since it is flush with the general bottom surface, a higher level surface that forms a flat surface higher than the step portion by a predetermined distance, and a pair of vent holes that pass vertically through the higher level surface at a position therein closer to the step portion.

Abstract: A steering device for a personal watercraft includes a handle holder fitted to a watercraft body. A steering shaft passes through the handle holder, and a handle is fitted to the upper end of the steering shaft. The steering shaft is provided with a groove, and a holding member is provided in the handle holder and is fitted into the groove. Accordingly, movement of the steering shaft in the axial direction is restricted. A flange or the groove has a shape such that its width can be reduced. When the holding member is fitted by setting the width to a small size, and taking dimensional variations into account, the chattering between the flange or the groove and the holding member can be reduced. In view of this, the steering shaft is provided with the flange or the groove, and the holding member provided in the handle holder is fitted to the flange or the groove, so that movement of the steering shaft in the axial direction can be restrained.

Abstract: To provide a jet propulsion watercraft that allows a step, a vent hole, and the like to be easily provided on a bottom surface thereof. A ride plate of a jet propulsion watercraft is a member, which is formed into a substantially rectangular shape in compliance to an opening in a bottom surface of a hull bottom. The ride plate is provided with a lock tab at a front edge thereof, and bolt holes are made in a right and left end portion thereof. The ride plate is further provided with a step portion that forms part of a general bottom surface, since it is flush with the general bottom surface, a higher level surface that forms a flat surface higher than the step portion by a predetermined distance, and a pair of vent holes that pass vertically through the higher level surface at a position therein closer to the step portion.