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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
motorcycle comply with applicable exhaust emissions standa rds
during
it
useful
life, when operated
and
maintained
according to the
instructions provided.
SOURCE OF EMISSIONS
The
combustion process produces carbon monoxide, oxides of
nit
rogen
and hydrocarbons. Control of
hydrocarbons
and
oxides of nitrogen
is
very
important because, under
certain conditions,
they
react
to form photochemical
smog when sub-
jected to sunlight. Carbon
monoxide does
not
react
in
the
sarna way, but is
toxic.
Honda Motor
Co., Ltd.
util
izes appropriate carburetor settings
as
well
as
other systems,
to reduce
carbon
monoxide
and
hydrocarbons.
EXHAUST EMISSION CONTROL SYSTEM
The
exhaust emission control system
is
composed of lean carbu
retor
setting,
no
adjustments should
be made
except
for
high altitude setting and idle speed adjustment with the
throttle
stop screw.
The
exhaust
emission control system
is
sepa-
rate from the crankcase emission 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
th rough the air cleaner and carburetor.
AIR CLEAN I'R
~
FRE$HAIR
_
BLOW-BY GAS
1-40
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