Exhaust Emission Control System (Pulse Secondary Air Injection System) - Honda CBR150R Manual

GENERAL INFORMA TlON
EXHAUST EMISSION CONTROL SYSTEM (PULSE SECONDAR Y AIR INJECTION SYSTEM)
The exhaust emission control system consists of a secondary air supply system which introduces filtered air into the
exhaust gases i n the exhaust port. Fresh air is drawn into the exhaust port whenever there is a negative pressure pulse
in the exhaust system. This charge of fresh air promotes burning of the unburned exhaust gases and changes a consid-
erable amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and water vapor.
This model has the pulse secondary air injection (PAIR) control valve and PAIR check valve. Pair check valve prevents
reverse air flow through the system. The PAIR control valve reacts to high intake manifold vacuum and will cut off the
supply of the fresh air during engine deceleration, thereby preventing afterburn in the exhaust system.
No adjustment to the pulse secondary air injection system should be made, although periodic inspection o f the com-
ponents is recommended.
PULSE SECONDARY
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