Patent ID: 7905320

Claim:
An exhaust system for a saddle-ride type vehicle, comprising: an exhaust pipe located between an engine of the vehicle and a muffler and having an open end within the muffler, the exhaust pipe serving as an inlet pipe of the muffler and directing the exhaust gas discharged from the engine through the open end into the muffler; an exhaust valve disposed in an exhaust passage within the muffler to control the flow rate of the exhaust gas; and a catalyst disposed within the exhaust pipe at a position near an end of the exhaust pipe that opens into the muffler, wherein two separators are provided within the muffler to partition an interior of the muffler into a first expansion chamber, a third expansion chamber, and a second expansion chamber between the first expansion chamber and the third expansion chamber, the open end of the exhaust pipe being disposed in the second expansion chamber, the exhaust valve being located in the third expansion chamber, an aperture being formed in one of the separators partitioning the second and third expansion chambers and covered by the exhaust valve such that the exhaust gas in the second and third expansion chambers directly communicates with each other through the aperture only when the exhaust valve is open.