Honda 1986 GoldWing GL1200A Manual page 5

General Information
Emission Control Systems - - - - - - - - - - - - - - - - - -
The U.S. Environmental Protection Agency and California Air Resources Board (CARB) require manufacturers to cer-
tify 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 pur-
chaser. when operated and maintained according to the instructions provided. Compliance with the terms of the
Distributor's Warranties 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 and hydrocarbons. Control of hydrocarbons 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 it is toxic.
Honda Motor Co., Ltd. utilizes a secondary air supply system, as well as other systems, to reduce carbon monoxide
and hydrocarbons.
Exhaust Emission Control System (Secondary Air Supply System)
The exhaust emission control system consists of a secondary air supply system which introduces filtered air into the
exhaust gases in the exhaust port. Fresh air is drawn into the exhaust port whenever there is a negative pressure
pulse in the exhaust system. This charge of fresh air promotes burning of the unburned exhaust gases and changes a
considerable amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and water.
The reed valve prevents reverse air flow through the system. The anti-afterburn valve reacts to high intake/vacuum
and will cut off the supply of fresh air during engine deceleration, thereby preventing afterburn in the exhaust system.
No adjustments to the secondary air supply system should be made, although periodic inspection of the components
is recommended.
Crankcase Emission Control System
The engine is equipped with a closed crankcase system to prevent crankcase emissions from being discharged into
the atmosphere. Blow-by gases are returned to the combustion chamber through the air cleaner. Condensed
crankcase vapors are accumulated in a storage tank which must be emptied periodically.
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