Emission Control Systems; Exhaust Emission Control System; Crankcase Emission Control System; Prohibited Actions - Honda TRX500FM Service Manual

GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB). and Environment Canada (EC)
require that off-road ATVs comply with applicable exhaust emissions standards during their useful life, when operated and
maintained according to the instructions provided .
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide (CO). oxides of nitrogen (NOx) and hydrocarbons (He). The control of
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.
EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system is composed of the PGM·FI system , and no adjustments should be made . The exhaust
emission control system is separate from the crankcase emission control system.
CRANKCASE EMISSION CONTROL SYSTEM
The engine is equipped with a dosed crankcase system to prevent discharging crankcase emissions into the atmosphere .
Blow-by gas is retumed to the combustion chamber through the air deaner and throttle body.
SERVICING THE HONDA
U.S.A. Only
THROTILE BODY
AIR CLEANER
BREATHER HOSE
<
f Fresh air
_ Blow-by gas
Maintenance , replacement or repair of the em ission con trol devices and syst em s m ay be perform ed by any ATV repair
establishm ent or individ ual usi ng parts that are "certifled" t o EPA stand ard s.
PROHIBITED ACTIONS
The following prohibitions apply to everyone with respect to the engine's emission control system.
You may not remove or disable any device or element of design that may affect an engine's emission levels. This restriction applies
before and after the engine In placed in service.
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