Honda C8R600F4 Service Manual page 34

GENERAL INFORMATION
EXHAUST EMISSION CONTROL SYSTEM (PULSE SECONDARY AIR INJECTION SYSTEM)
The exhaust emission control system consists of a secondary air supply system which introduces filtered air into the exhaust
oasP.s in th?. exhi:iust riort_ Fresh i:iir is drawn into the exhaust port whenP.ver thMP. is a
m~oativA
rirno:;s1irn ri1ilse in the Axha1ist
system. This charge of fresh air promotes burning of the unburned exhaust gases and charges a considerable 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 valves. 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 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 of the components
is recommended.
AIR CLEANER
PAIR CHECK VALVE
PAIR CONTROL VALVE
1-30
AIR SUPPLY HOSE
(California: No. 15)
/
VACUUM TUBE
/(California: No. 10)
¢,=JFRESHAIR
. . . EXHAUST GAS