Honda CBR125R, Owner'S Manual

Page: 34 / 430

GENERAL INFORMATION
1-30
EMISSION CONTROL SYSTEMS (Except CM type)
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide (CO), oxides of nitrogen (NO
x
) and hydrocarbons (HC). Control of
carbon monoxide, oxides of nitrogen and hydrocarbons 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.
Honda Motor Co., Ltd. utilizes various systems (page 1-31) 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 air cleaner housing and throttle body.
BLOW-BY GAS
FRESH AIR
THROTTLE BODY
AIR CLEANER
HOUSING
CRANKCASE
BREATHER HOSE