Exhaust system for motorcycle

An exhaust system adapted for use with a motorcycle with an engine supported on a vehicle body disposed between a front wheel and a rear wheel, a swing arm which is provided on said vehicle body, extends rearward and turnably supports said rear wheel on a rear end thereof, a seat disposed on the upper side of said rear wheel and supported by said vehicle body, the exhaust system comprising:

• an exhaust pipe which extends from a cylinder head of said engine rearward on a first lateral side of said vehicle body and which, on a front side of said rear wheel, transverses from one of the lateral sides of said vehicle body to a second lateral side, with a transverse portion of said exhaust pipe passing between said swing arm and said seat,
• wherein a muffler having an outside diameter greater than an outside diameter of said exhaust pipe is disposed at said transverse portion of said exhaust pipe,
• wherein the transverse portion is provided with a maintenance lid on an upper facing side thereof, and
• further comprising:
• an inner pipe connected to a rear portion of said exhaust pipe and subjected to punching for permitting an exhaust gas to flow therethrough, wherein said muffler includes an outer tube covering said inner pipe and said rear portion of said exhaust pipe, and a sound absorbing material placed in said outer tube.