Emission Control Systems; Source Of Emissions; Crankcase Emission Control System - Honda GL1800 Service Manual

EMISSION CONTROL SYSTEMS

The U.S. Environmental Protection Agency, Transport Canada and California Air Resources Board (CARB) require
manufacturers to certify that their motorcycles comply with applicable exhaust emissions standards during their useful
life, when operated and maintained according to the instructions provided, and that motorcycles built after January 1,
1983, comply with applicable noise emission standards for one year or 6,000 km (3,730 miles) after the time of sale to the
ultimate purchaser, when operated and maintained according to the instructions provided. Compliance with the terms of
the Distributor's Limited Warranty for Honda Motorcycle Emission Control Systems is necessary in order to keep the
emissions system warranty in effect.

SOURCE OF EMISSIONS

The combustion process produces carbon monoxide, hydrocarbons and oxides of nitrogen. Control of hydrocarbons and
oxides of nitrogen is very important because, under certain conditions, they react to form photochemical smog when
subjected to sunlight. Carbon monoxide does not react in the same way, but is toxic.
Honda Motor Co., Ltd., utilizes PGM-FI, two three-way catalytic converters (one in each exhaust pipe) and two heated
oxygen sensors (one in each exhaust pipe) to reduce carbon monoxide, hydrocarbons, and oxides of nitrogen.

CRANKCASE EMISSION CONTROL SYSTEM

The engine is equipped with a closed crankcase system to prevent discharging crankcase emissions into the atmosphere.
Blow-by gas is returned to the combustion chamber through the air cleaner and throttle body.
IR CLE NER
THROTTLE BODY
GENERAL INFORMATION
FRESH IR
BLOW-BY G S
DR IN HOSE
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