Honda CBR929RR [41/488] Page 41

Honda CBR929RR [41/488] Page 41
EXHAUST EMISSION CONTROL SYSTEM (SECONDARY AIR SUPPLY SYSTEM)
The exhaust emission control system is composed of a lean fuel injection setting, and no adjustments should be made
except idle speed adjustment with the throttle stop screw
. The exhaust emission control system is separate from the
crankcase emission control system
.
The exhaust emission control system consists of a secondary air supply system which introduces filtered air into the exhaust
gases in the exhaust port
. Fresh air is drawn into the exhaust port by the function of the PAIR (Pulse Secondary Air Injection)
control valve
.
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 reed valve prevents reverse air flow through the system
. The PAIR control valve is operated by the solenoid valve
. The
solenoid valve is controlled by the PGM-Fl unit, and the fresh air passage is opened/closed according the 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
.
AIR CLEANER HOUSING
N9
PI
P
. I
=0
// /
PAIR CONTROL VALVE
> il
PAIR CHECK VALVE
~
, ,
016
EXHAUST PORT
GENERAL INFORMATION
THROTTLE BODY
California type
:
The California type also equipped two three-way warm-up catalytic converters, a three-way catalytic converter, and a heated
oxygen sensor
.
The three-way catalytic converters are in the exhaust system
. Through chemical reactions, they convert HC, CO, and NOx in
the engine's exhaust to carbon dioxide (CO2), dinitrogen
(N2),
and water vapor
.
No adjustment to these systems should be made although periodic inspection of the components is recommended
.
1-41

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