Emission Control Systems - Honda VT600C Shadow VLX Service Manual

EMISSION CONTROL SYSTEMS

The U . S . Environmental Protection Agency and California Air Resources Board (CARB) requ ire 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, and that motorcycles built after January 1 , 1 983 comply with applicable noise emis­
sion standards for one year or 6,000 km (3, 7 30 miles) after the time of sale to the ultimate purchaser, when operated and
maintained according to the instructions provided . Compliance with the terms of the Distributor ' s Limited Warranty for Honda
Motorcycle Emission Control System is necessary i n order to keep the emissions system warranty in effect.
S O U R C E O F E M I S S I O N S
·
The combustion process p roduces carbon monoxide and hydrocarbons. Control o f hydrocarbons i s 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 it is toxic.
Honda Motor Co . , Ltd . utilizes lean carburetor settings as well as other systems, to reduce carbon monoxide and hydro­
carbons.
EXHAUST E M I S S I O N C O N T R O L SYST E M
The exhaust emission control system is composed o f a l e a n carburetor setting, and no adjustments should be m a d e except
idle speed adjustment with the throttle stop screw. The exhaust emission control-system is separate from the crankcase
emission control syste m .
CRA N K C A S E E M I S S I O N C O N T R O L S Y S T E M
The engine is equipped with a closed crankcase system which routes crankcase emissions through the air cleaner into the
combustion chamber.
( 1 l CRAN KCASE BREATHER
SEPARATOR
c::: :>
FRESH A I R
BLOW-BY GAS
-+
(2) AIR CLEANER HOUSING
G E N ERAL I N FO RMATIO N
1 - 2 1