1998-2004 Honda Foreman 450 factory service manual, Page 42Get this manual
GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The California Air Resources Board (CARB) requires manufacturers to certify that their 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 and hydrocarbonsControl of hydrocarbons is very important because, under certain conditions, they react to from photochemical smog when subjected to sunlightCarbon monoxide does not react in the same way, but it is toxicHonda Motor Co Ltdutilized lean carburetor settings as well as other systems, to reduce carbon monoxide and hydrocarbons