Emission Control Systems - Honda VT750C2 Shadow Spirit Service Manual

GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
EXHAUST EMISSION REQUIREMENT
The U.S. Environmental Protection Agency (EPA), California Air Resources Board (CARB) and Transport Canada require
manufacturers to certify that their motorcycles comply with applicable exhaust emissions standards during their useful
life, when operated and maintained according to the instructions provided.
NOISE EMISSION REQUIREMENT
The EPA also required that motorcycles built after January 1, 1983 comply with applicable noise emission standards for
one year or 6,000 km (3,730 miles) after the time of sale to the ultimate purchaser, when operated and maintained
according to the instructions provided.
WARRANTY COMPLIANCE,
Compliance whhthe terms'of}be Dil?tributor's Limited Warranty for Honda Motorcycle Emission Control Systems is
necessary in order to keep the emissions system warranty in effect.
SOURCE OF EMIS'SIONS
The combustion process produces carbon monoxide (CO), oxides of nitrogen (NOx) 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 subjected to sunlight. Carbon monoxide does not react in the same way, but is toxic.
Honda Motor Co., ltd. utilizes appropriate carburetor settings as well as other systems, to reduce carbon monoxide, and
hydroca rbons.
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. .
AIR CLEANER
«;
FRESH AIR
~
BLOW-BY GAS
' ..39