Patent ID: 6783413
Filing Date: 2004-08-31
Classification: B63H,F01N,F01P,F02B

Abstract:
An outboard motor comprising an internal combustion engine, an intermediate member supporting the engine, a housing unit supporting the intermediate member, and an exhaust system configured to guide exhaust gases from the engine, the exhaust system including a main exhaust passage and an idle exhaust passage, the main exhaust passage configured to discharge exhaust gases produced at engine speeds above idle to the body of water through the housing unit, the idle exhaust passage configured to discharge exhaust gases produced at idle engine speeds to the atmosphere, the intermediate member defining at least a portion of the main exhaust passage and a portion of the idle exhaust passage, the intermediate member forming a recessed area in the main exhaust passage portion, the idle exhaust passage having a port that opens at the recessed area, the recessed area being larger than the port and being formed such that a step, which is defined between a portion of the main exhaust passage and a portion of the recessed area, includes an edge that extends in an upward direction.