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Air intake injection system
D
SECONDARY AIR SYSTEM TECHNICAL CHARACTERISTICS (MY10 -> MY12)
F4 bikes use an additional system for the secondary flow of induction air. Through this system, part of the air from
the Airbox is channelled near the exhaust pipes of the cylinder through a set of on/off valves and passageways
inside the engine head. So, when needed, the system promotes the post-combustion of any un-burnt hydrocar-
bons in the exhaust gases, thereby reducing the emission of pollutants into the atmosphere..
SECONDARY AIR VALVE
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