Exhaust device for motorcycle engine

摘要

Object To cause a muffler to efficiently reduce noise. Solving Means Front side exhaust pipes 12 and rear side exhaust pipes 13 are extended from front cylinders 10 and rear cylinders 11, respectively, of a V-type water-cooled 4-cylinder engine 3 and collected to a catalyst chamber 15 disposed below a crankcase 14. The catalyst chamber 15 is connected to an exhaust chamber 16 located rearward thereof in which exhaust gas is expanded. An outlet pipe 40 laterally projects from a lateral surface of a rear end portion of the exhaust chamber 16 and is connected to a front pipe 63 projecting from the lateral surface of the front portion of a muffler 17. In this way, the front pipe 63 is transversely inserted into the muffler 17 to increase a cross-section ratio, thereby efficiently reducing noise.