2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 28Get this manual
GENERAL INFORMATION
EXHAUST EMISSION CONTROL SYSTEM
The Celilornia Air Resources Board (CARSrequires manufacturers to certify Ihallheir ATVs complv with applicable exhaust
emissions standards during their u58lullilll, when operated and maintained according to Ihe ins!lUeticnprovided
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide and hydrocarbonsControlling hydrOCllrbon emissions is very imporlant because, under certain conditions, they react to form photochemical smog when SUbjected to sunlightCarbon monoxide does not rllllCt in the same waybut it is loxicHonda Motor Co lidutilizes lean carburetor settings liS well as other systems, to reduce carbon monoxide and hydrocarbons