Honda 2006 RC51 Owner's Manual page 216

Exhaust Emission Control System
The exhaust emission control system
includes a secondary air supply system
and a PGM-FI system.
No adjustment to these systems should be
made although periodic inspection of the
components is recommended.
Ignition Timing Control System
The system constantly adjusts the ignition
timing, reducing the amount of HC, CO
and NOx produced.
Emission Control Systems
PGM-FI System
The PGM-FI system uses sequential
multiport fuel injection. It has four
subsystems: Air Intake, Engine Control,
Fuel Control, and Exhaust Control.
The Engine Control Module (ECM) uses
various sensors to determine how much air
is going into the engine. It then controls
how much fuel to inject under all
operating conditions.
Secondary Air Injection System
The secondary air injection system
introduces filtered air into the exhaust
gases in the exhaust port. The secondary
air injection system helps improve
emission performance.
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