2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 25Get 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
SOURCE OF EMISSIONS
The combustion process produces carbon monoxide and hydrocarbonsControlling 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, reduce carbon monoxide and hydrocar-
EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system is composed of lean carbu retor senings, no adjustments should be made except idle speed adjustment with the thronle stop screwThe exhaust emission control system is separate from the crankcase emission control system
CRANKCASE EMISSION CONTROL SYSTEM