EXHAUST GAS SENSOR INSTALLATION STRUCTURE FOR FOUR-CYCLE ENGINE

摘要

Providing an exhaust gas sensor installation structure for a four-cycle engine, in which an exhaust gas sensor is installed in a cylinder head of an engine main body, the exhaust gas sensor including a sensor main part an end portion of which is exposed in an exhaust port and a cap which is fitted to a rear portion of the sensor main part and from a side of which a cord extends, the exhaust gas sensor installation structure being such that, when the exhaust gas sensor is installed in the cylinder head, the direction in which the cord extends from the exhaust gas sensor is fixedly defined to make handling of the cord easy. A sensor installation hole for installing a sensor main part is provided in a portion around an exhaust port of a cylinder head, a cap is at least partly covered by a sensor guard fixedly positioned relative to the cylinder head, and a direction in which a cord extends is fixedly defined by the sensor guard relative to the cylinder head.