Structure for introducing secondary air into exhaust path of internal combustion engine

摘要

A secondary air introducing path 23 is formed in a cylinder head 1 along an exhaust port 5. Secondary air is fed by an air pump with pressure, and an outlet 23a of the secondary air introducing path 23 is formed so that a blowing direction of the outlet 23a is directed to an exhaust valve 7 side. There is provided a water jacket 22 between the secondary air introducing port 23 and an upper portion of the cylinder head 1.