2001-2003 Honda TRX500FA Factory Service Manual, Page 36Get this manual
GENERAL INFORM ATION
EMISSION CONTROL SYSTEMS
The Californ ia ir Resources Board (CA RB) req uires anufacturers to ce rtify that th eir ATVs comply with ap plicable exhaust em issio ns standards during their useful lifewh en ope rated and mainta ined acco rding to the instructions provided
SOURCE OF EMISSIONS
The com bu stion process produces carbon monoxide and hyd roca rbonsControlling hyd rocarbo emissions is very important becauseunder certain conditionsthey react for pbotocnemical smog when su bj ected su nlightCarbon monoxide does not react in the same way, but it is toxicHonda Molor Co" ltdutilizes lean carbu retor sett ing as ell as other sys tem s, redu ce carbon monoxide and hy rocar -
EXHAUST EMISSION CONTROL SYSTEM