Patent ID: 7896127

Claim:
A muffler unit for a general-purpose engine including an engine body having an exhaust port, the muffler unit comprising: an exhaust pipe having a first end adapted to be connected to the exhaust port of the engine body and a second end opposite to the first end; and a muffler having a maze of sound-deadening chambers defined therein and an inlet pipe disposed inside the muffler, the inlet pipe having an open end connected to the second end of the exhaust pipe and a closed end opposite to the open end, the closed end of the inlet pipe being exposed to the outside air, the inlet pipe further having a group of perforations formed therein to connect an internal space of the inlet pipe in fluid communication with a first sound-deadening chamber of the maze of sound-deadening chambers, the perforations being located closer to the open end than to the closed end of the inlet pipe wherein the muffler has a single first attachment portion adapted to be attached to the engine body, wherein the first end of the exhaust pipe has a second attachment portion and a third attachment portion that are disposed symmetrically with respect to a central axis of the exhaust pipe for attachment to the exhaust port of the engine body, and wherein in a plan view, the first, second and third attachment portions are located at respective corners of a triangle, and the muffler has a center of gravity disposed inside the triangle.