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Exhaust Emission Control System
Crankcase Emission Control System
Source of Emissions
Emission Control Systems
Technical Information
The exhaust emission control system is
composed of lean carburetor settings, 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 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.
The combustion process produces carbon
monoxide (CO) and hydrocarbons (HC).
Control of hydrocarbons 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 lean carburetor
settings and other systems to reduce carbon
monoxide and hydrocarbons.
03/03/07 16:37:06 31KPS610_163
Summary of Contents for CRF230F 2004
Page 2: ...2004 Honda CRF230F OWNER S MANUAL 03 03 07 16 14 56 31KPS610_002 ...
Page 9: ...03 03 07 16 15 51 31KPS610_009 ...
Page 19: ...10 Motorcycle Safety 03 03 07 16 16 56 31KPS610_019 ...
Page 23: ...rear brake pedal 14 Component Locations Operating Controls 03 03 07 16 17 14 31KPS610_023 ...
Page 29: ...20 Operating Controls 03 03 07 16 18 03 31KPS610_029 ...
Page 151: ...142 Taking Care of the Unexpected 03 03 07 16 35 32 31KPS610_151 ...