| 摘要 |
An outboard motor comprising a propulsion unit including a propeller shaft, and an internal combustion engine drivingly connected to the propeller shaft and including a V-shaped cylinder block having first and second cylinder banks including respective first and second cylinders having respective first and second exhaust ports, and the cylinder block defining an exhaust chamber communicating with the exhaust ports, a cowling surrounding the engine and including an upper portion and a lower portion, a muffler located between the cylinder banks and including an inner cover portion which has therein an exhaust inlet communicating with the exhaust chamber and which engages the cylinder block, an outer cover portion, and a main cover portion which is located between the inner and outer cover portions and which defines an exhaust outlet and an expansion chamber communicating between the exhaust inlet and the exhaust outlet, and an exhaust conduit extending through the lower cowling portion and communicating between the exhaust outlet and the atmosphere.
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