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Technical Information
155
Emission Control Systems
Source of Emissions
The combustion process produces carbon
monoxide (CO), oxides of nitrogen (NOx), and
hydrocarbons (HC). Control of hydrocarbons
and oxides of nitrogen is very important
because, under certain conditions, they react to
form photochemical smog when subjected to
sunlight. Carbon monoxide does not react in
the same way, but it is toxic.
Honda Motor Co., Ltd. utilizes various systems
to reduce carbon monoxide, oxides of nitrogen
and hydrocarbons.
Exhaust Emission Control System
The exhaust emission control system includes a
PGM-FI system. No adjustment to this system
should be made although periodic inspection of
the components is recommended. The exhaust
emission control system is separate from the
crankcase emission control system.
Evaporative Emission Control System
(AC type only)
An evaporative emission control system uses
pressure proof fuel tank and fuel fill cap which
maintains inside of the fuel tank at a high
pressure to keep fuel vapor in itself while the
engine is off.
An add-on or modified part must be compliant
with applicable ARB evaporative emission
control standards. A violation of this
requirement is punishable by civil and/or
criminal punishment.
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 air
cleaner and throttle body.
20YM CRF125FFB_31K28B60_FM.book 155 ページ ２０１９年３月１日 金曜日 午後１時４８分
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