2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 54Get this manual
GENERAL INFORMATION
EMISSION CONTROL SYSTEMS
The U.SEnvironmental Protection Agency lEPA), California Air Resources Board (CAR B), and Environment Canada (EG) require that off-road ATVs comply with applicable emissions standards during their useful life, when operated and maintained according to the instructions provided
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide, oxides of nitrogen and hydrocarbonsControl of hydrocarbons and oxides of nitrogen 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 various systems to reduce carbon monoxide, oxides of nitrogenand hydrocarbons