Patent ID: 7610748

Claim:
In a motorcycle of the type having a multi-cylinder engine and an exhaust system comprising a separate exhaust pipe extending from each respective cylinder of the engine, the improvement comprising improved mounting structure in said exhaust system for supportively receiving an air-fuel ratio sensor used for linearly detecting a concentration of oxygen in an exhaust gas of the motorcycle during operation thereof, the air-fuel ratio sensor comprising an element whose output voltage changes in proportion to the oxygen concentration in an exhaust stream, wherein the exhaust pipes are joined together at a hourglass-shaped convergent connector having a minimum width portion, wherein said fuel-air ratio sensor is mounted substantially centrally on the convergent connector, wherein said convergent connector comprises a connector body having an inclined surface, and wherein the air-fuel ratio sensor is mounted on the inclined surface of said convergent connector so as to be inclined towards a rear of said motorcycle, wherein said air-fuel ratio sensor is mounted on the inclined surface so as to be inclined towards a center of the motorcycle in a width direction of the motorcycle; and wherein said exhaust system is placed on of a left side and a right side of the motorcycle.