Exhaust Emission Control System (Pulse Secondary Air Injection System): 05 And 06 California Type, After 06; Servicing The Honda; Prohibited Actions - Honda CRF450X 2005 Service Manual

GENERAL INFORMATION
EXHAUST EMISSION CONTROL SYSTEM (PULSE SECONDARY AIR INJECTION SYSTEM) :
'05 and '06 California type, After '06
The exhaust emission control system includes a secondary air supply system which introduces filt ered ai r into the exhaust
gases in the exhaust port. Fresh air is drawn i nto 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 considerable
amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and water vapor.
This model has a pulse secondary air injection (PAIR ) control valve. A PAIR check valve prevents reverse air fl ow through
the system. The PAIR control valve reacts to high intake manifold vacuum and will cut off the supply of fresh air during
r-
engine deceleration, thereby preventing aherburn in the exhaust system.
'-
No adjustment to the PAIR system should be made, although periodic inspection of the components is recommended.
PAIR COIN!'lOLVALVE
AIR HOSE
SERVICING THE HONDA
U.S.A. Only
VACUUM HOSE
AIR CLEANIER
¢:J
FRESH AIR
•
EXHAUST GAS
...
VACUU M AlA
Maintenance, replacement or repair of the emission control devices and systems may be performed by any motorcycle
repair establishment or individ ual using parts that are "certified " to EPA standards.
PROHIBITED ACTIONS
The following prohibitions apply to everyone with re spect to the engine's emission control system.
You may not remove or disable any device or element of design that may affect an engine's emission levels. Th is restric-
tion applies before and after the engine in placed in service.
Vehicles that are u sed only for competition are exempt from this prohibition.
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