| 摘要 |
<p>An exhaust system for a motorcycle in which a catalyzer casing of cylindrical shape retaining a catalyzer is accommodated in an exhaust muffler arranged in the rear of and under an engine main body is aimed at making it easy to ensure a bank angle and ensuring a capacity of a catalyzer and the flow length of exhaust gas to thereby improve a purification performance. The exhaust muffler is provided at opposite sides thereof in the vehicle width direction with a pair of lateral walls which are inclined so as to come closer to each other as going downward, and is formed in the shape of an inverted trapezoid in an elevational view as seen from the rear side in a forward and rearward direction of a vehicle. A bent section is formed in an intermediate portion, within the exhaust muffler, of an exhaust gas conduit passing through a front end wall of the exhaust muffler and changes the flow direction of exhaust gas from the forward and rearward direction of the vehicle to the vehicle width direction. A catalyzer casing having one end connected to a downstream end portion of the exhaust gas conduit is arranged in an inclined condition to be lowered as approaching one side in the vehicle width direction.</p> |
