Honda CBR650RA Shop Manual page 55

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EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system is composed of a pulse secondary air supply system, 3-way catalytic converter and PGM-FI
system.
SECONDARY AIR SUPPLY SYSTEM
The pulse secondary air supply system introduces filtered air into the exhaust gases in the exhaust port [1]. Fresh air is drawn into
the exhaust port by the function of the PAIR control solenoid valve [2].
This charge of fresh air promotes burning of the unburned exhaust gases and changes a considerable amount of hydrocarbons and
carbon monoxide into relatively harmless carbon dioxide and water vapor.
The PAIR check valve [3] prevents reverse air flow through the system. The PAIR control solenoid valve is controlled by the PGM-
FI unit, and the fresh air passage is opened/closed according to running condition (ECT/IAT/TP/MAP sensor and engine
revolution).
No adjustments to the secondary air supply system should be made, although periodic inspection of the components is
recommended.
[2]
[3]
3-WAY CATALYTIC CONVERTER
This motorcycle is equipped with a 3-way catalytic converter. The 3-way catalytic converter is in the exhaust system. Through
chemical reactions, they convert HC, CO and NO
vapor.
[1]
in the engine's exhaust to carbon dioxide (CO
X
GENERAL INFORMATION
Fresh Air
Exhaust Gas
), dinitrogen (N ), and water
2 2
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