Outboard motor exhaust system

An exhaust system for an outboard motor having an internal combustion engine, comprising a protective cowling configured to surround the engine, a discharge route configured to discharge exhaust gases to the atmosphere from the engine, the discharge route including an expansion chamber for the exhaust gases defined by at least a bottom surface of the protective cowling and a separable member.

An exhaust system for an internal combustion engine, comprising at least first, second, third and fourth components together defining an exhaust passage through which exhaust gases are discharged to the atmosphere from the engine, the first component arranged to support the engine, the second component arranged to surround the engine, the third component coupling the first component with the second component, the exhaust passage including an expansion chamber, the second and fourth components together defining the expansion chamber.

An outboard motor comprising an internal combustion engine powering a propulsion device, a cowling assembly surrounding the engine, the cowling assembly including a bottom cowling member and a top cowling member detachably coupled with the bottom cowling member, the bottom cowling member having a portion defining, at least in part, means for expanding and routing exhaust gasses to the atmosphere.