2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 48Get this manual
GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The U.SEnvironmental Protection Agency (EPA), and California Air Resources Board (CARB) require that this off-road ATV comply with applicable exhaust emissions standards during its useful life, when operated and maintained according to the instructions provided
SOURCE OF EMISSIONS
The combustion process produces oxide of nitrogen, carbon monoxide and hydrocarbonsControlling oxide of nitrogen and hydrocarbon emissions is very important because, under certain conditions, they react to form photochemical smog when subjected to sunlightCarbon monoxide does not react in the same way, but it is toxicHonda Motor Co Ltdutilizes lean carburetor settings as well as other systems to reduce oxides of nitrogen, carbon monoxide and hydrocarbons