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Technical Information 165
Emission Control Systems
Source of Emission
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 is
composed of appropriate carburetor settings. No
adjustments should be made except for an idle
speed adjustment with the throttle stop screw.
The exhaust emission control system is separate
from the crankcase emission control system.
Secondary Air Injection System
The exhaust emission control system consists of
a 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 control performance.
No adjustments to this system should be made
although periodic inspection of the components is
recommended.
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
muffler through the air cleaner and the carburetor.
Fuel Permeation Emission Control System
This vehicle complies with the Fuel Permeation
Emission Control regulations of the U.S.
Environmental Protection Agency (EPA), the
California Air Resources Board (CARB), and
Environment Canada (EC).
The fuel tank, fuel hoses, and fuel vapor charge
hoses used on this vehicle incorporate fuel
permeation control technologies.
Tampering with the fuel tank, fuel hoses, or
fuel vapor charge hoses to reduce or defeat the
effectiveness of the fuel permeation technologies
is prohibited by federal regulations.
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