| 摘要 |
PURPOSE:To secure the length of the first exhaust pipes for sufficient engine performance by arranging an exhaust control valve at the front below of an engine, curing the first exhaust pipe to be bulged forward from the front face of the engine, and connecting it to the front face of an expansion chamber. CONSTITUTION:An exhaust system 50 is constituted of four first exhaust piece 52 independently connected for individual cylinders of an engine 10, an exhaust control valve 54 located at the front below of the engine 10, an exhaust expansion pipe 56 located behind it, the second exhaust pipe, and a muffler. Individual first exhaust pipes 52 are curved to be bulged forward from the front face of an engine cylinder 30, their downstream ends are integrated with branch pipes 62 in a square cross section shape, and they are adjacently opened and connected to the front face of the exhaust valve 54 in the horizontal direction. The length of the first exhaust pipes required for sufficient engine performance can be secured, and the road clearance can be sufficiently secured. |
