Emission Control Systems - Honda CBR650F Service Manual

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GENERAL INFORMATION

EMISSION CONTROL SYSTEMS

SOURCE OF EMISSIONS
The combustion process produces carbon monoxide (CO), oxides of nitrogen (NO
hydrocarbons and oxides of nitrogen is very important because, under certain conditions, they react to form photochemical smog
when subject to sunlight. Carbon monoxide does not react in the same way, but it is toxic. Uncontrolled fuel evaporation also
releases hydrocarbons to the atmosphere.
Honda Motor Co., Ltd. utilizes various systems to reduce carbon monoxide, oxides of nitrogen and hydrocarbons.
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 crankcase breather hose [1] air cleaner housing [2] and throttle body [3].
[1]
1-38
) and hydrocarbons (HC). The control of
X
[2]
[3]
Fresh Air
Blow-by Gas