Honda VTX1300C VTX 2004 Owner's Manual page 195

Emission Control Systems
Exhaust Emission Control System
The exhaust emission control system
includes a secondary air supply system,
and an oxidation catalytic converter.
No adjustment to these systems should be
made although periodic inspection of the
components is recommended.
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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Technical Information
Oxidation Catalytic Converter
The oxidation catalytic converter is in the
exhaust system. Through chemical
reactions, they convert HC and CO in the
engine's exhaust to carbon dioxide (CO )
and water vapor.
Crankcase Emission Control System
The engine is equipped with a closed
crankcase system to prevent discharging
crankcase emissions into the atmosphere.
Blow-by gas is returned to the combustion
chamber through the air cleaner and the
carburetor.
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