Water jet propulsion watercraft

摘要

A water jet propulsion watercraft includes a hull having a sealed engine room, an engine installed in the engine room, a jet propulsion unit arranged to be driven by the engine so as to suck in water from around the hull and jet the water, a saddle type seat disposed above the engine room, a first exhaust pipe, an exhaust pipe cooling unit, and a catalyst unit. The first exhaust pipe is attached to a side of the engine inside the engine room, extends rearward from the side of the engine, and is arranged to guide exhaust gas discharged from the engine. The exhaust pipe cooling unit is arranged to cool the first exhaust pipe. The catalyst unit is connected to the first exhaust pipe, is disposed inside the engine room so as to oppose a rear surface of the engine, and is arranged to promote reaction of components contained in the exhaust gas.

主权项

1. A water jet propulsion assembly comprising:
an engine including a cylinder head including an exhaust port, and a rear surface facing a rear direction of the water jet propulsion assembly; a jet propulsion unit configured to be driven by the engine so as to suck in water from outside of the water jet propulsion assembly and jet the water; a first exhaust pipe attached to a side of the engine, connected to the exhaust port, extending rearward from the exhaust port to a rear end of the engine when the engine is viewed from a side direction, and configured to guide exhaust gas discharged from the engine; an exhaust pipe cooling unit configured to cool the first exhaust pipe; and a catalyst unit connected to the first exhaust pipe, extending in a width direction of the water jet propulsion assembly in a region that is rearward of the rear surface of the engine, and configured to promote reaction of components contained in the exhaust gas.