SECONDARY AIR FEEDING DEVICE FOR EXHAUST OF FORCED AIR COOLING TYPE ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a secondary air feeding device for the exhaust of a forced air cooling type engine capable of feeding the secondary air with a simple structure, being miniaturized to facilitate a layout, and reducing a thermal effect from a cylinder head. SOLUTION: The cylinder head 40 or the like is surrounded by a cooling wind cowling 48 to cool the cylinder head 40 or the like with a cooling fan 50 in this forced air cooling type engine 20 of a motorcycle. A secondary air reed valve 44 is arranged on an exhaust system to feed the secondary air to an exhaust path 41a via the secondary air reed valve 44 in this secondary air feeding device 42 for the exhaust. The secondary air reed valve 44 is integrally incorporated in the cylinder head 40 and surrounded by the cooling wind cowling 48 to be invariably exposed to the cooling wind introduced into the cooling wind cowling 48.