SECONDARY AIR SUCTION SYSTEM OF MOTORCYCLE

PROBLEM TO BE SOLVED: To improve a secondary air suction system of a motorcycle so as to obtain a necessary amount by increasing a secondary air suction volume without affect of the output reduction, etc. SOLUTION: In the motorcycle in which secondary air is supplied into the exhaust passage of an engine 16, a first air introducing passage 75 and a secondary air introducing passage 76 as a plurality of the secondary air introducing passages are installed in an exhaust pipe 33 as an exhaust passage, secondary air is introduced into the exhaust pipe 33 from the first air introducing passage 75 and the secondary air introducing passage 76, and the secondary air introducing volume into the exhaust pipe 33 is increased to promote the oxidation of unburned gas in the exhaust pipe 33. COPYRIGHT: (C)2006,JPO&NCIPI