1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 36Get 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 (California type only)
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide and hydrocarbonsControl of hydrocarbons is very important because, under certai conditions, they react to orm photochemical smog when subjected to sunlightCarbon monoxide does not react in the same waybut it is toxicHonda Motor Co Ltdutilizes lean carburetor settings as well as other systems, to redu ce carbon monoxide and hydrocarbons