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GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The
U.S.
Environmental Protection Agency (EPA), and the California Air Resources Board (CAR B) require that off-road ATV
comply with
appl
icable exhaust emissions standards during its
usafullife,
when operated and
maintained
according to the
instruction provided.
SOURCE OF EMISSIONS
The combustion process produces carbon
monoxide,
oxide of nitrogen and
hydrocarbons.
Control of
hydro
carbons and
oxides of nitrogen is very important
because,
under certain
conditions,
they react to form photochemical smog when sub-
jected 10 sunlight. Carbon monoxide does not react in the same
way,
but it is toxic
.
Honda
Motor Co.,
ltd.
uti
l
izes various systems to reduce carbon monoxide, oxides of nitrogen, and hydrocarbon.
EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system is composed of 8 lean carburetor setting
.
and no adjustments should be made except
for high altitude setting and idle speed adjustment w ith the
throttle
stop screw. The exhaust emission control system is
separate from the crankcase emi ssion control system
.
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 carburetor.
CARBURETOR
AIR CLEANER
HOUSING
q
Fresh air
. .
Blow-by
gas
1-49
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