Patent ID: 7856814
Filing Date: 2010-12-28
Classification: F01N

Abstract:
1. An exhaust device for a motorcycle including an engine having a plurality of cylinders comprising: a plurality of upstream exhaust pipes respectively connected to exhaust ports for said cylinders; an exhaust control valve provided in a downstream exhaust pipe; and a separator provided in an exhaust manifold portion of said exhaust pipe for gradually joining the flows of exhaust gas; wherein said exhaust control valve is located on a downstream side of said separator so that a main surface of said exhaust control valve, in its fully open condition, becomes substantially parallel to a main surface of said separator whereby the amount of an exhaust gas striking a thickness of the exhaust control valve is reduced, creating a low exhaust resistance and wherein the separator includes the main surface that is arranged substantially horizontally and is substantially parallel to the exhaust control valve in a fully open position, the main surface being concaved towards a lower side of a vehicle body.