Patent ID: 8151932

Claim:
A muffler device for a motorcycle, the muffler device comprising: an exhaust pipe having one end connected to an exhaust port of an engine and a muffler connected to the other end of said exhaust pipe; said muffler comprising a muffler body as an outer member, a tail cap closing a rear end opening of said muffler body, an inner pipe accommodated in said muffler body, a tail pipe accommodated in said muffler body and connected to said inner pipe, said inner pipe having one end connected to said exhaust pipe, said tail pipe having one end connected to an exhaust outlet formed through said tail cap, and a folded portion forming an opening edge of the exhaust outlet; wherein said tail cap is formed with an annular mud guiding groove as a narrow groove surrounding said exhaust outlet, wherein the annular mud guiding groove comprises an inner circumferential wall, a bottom wall, and an outer circumferential wall, wherein the outer circumferential wall is tapered so that a width of the annular mud guiding groove is gradually increased toward a rear opening thereof, and the outer circumferential wall is continuously connected to an outer flange at a position rearwardly projected from an end of the folded portion.