Patent ID: 7934965
Filing Date: 2011-05-03
Classification: B63H

Abstract:
1. An exhaust system for a small watercraft, comprising: a water muffler arranged on one side of a pump chamber; an exhaust pipe adapted to extend from an engine and connected through the water muffler to the pump chamber; and an exhaust pipe extending upwardly from the water muffler, said exhaust pipe being bent into a U-shape so as to extend downwardly, and penetrate through an upper wall of the pump chamber wherein an exhaust outlet thereof opens into the pump chamber; and a resonator being provided independent of the exhaust pipe, said resonator being connected to the water muffler; wherein the exhaust outlet of the exhaust pipe is disposed at a position wherein the exhaust outlet sinks into water at the time when a travel speed of the watercraft body is a predetermined speed or less, and the exhaust outlet is raised above the water at the time when the travel speed of the watercraft exceeds the predetermined speed and the exhaust outlet, as viewed from a rear of the watercraft body, is provided so as to be offset toward a side wall surface of the pump chamber from a center of a jet pump in the pump chamber, and an open surface of the exhaust outlet is made oblique toward the side wall surface toward which the exhaust outlet is offset.