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EXHAUST EMISSION CONTROL SYSTEM
The exhaust emission control system is composed of a pulse secondary air injection system and lean carburetor settings.
No adjustment should be made except idle speed adjustment with the throttle stop screw. The exhaust emission control system is
separate from the crankcase emission control system.
SECONDARY AIR SUPPLY SYSTEM
The secondary air supply system introduces filtered air into the exhaust gases in the exhaust port. Fresh air is drawn into the exhaust
port by the function of the PAIR control valve.
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 vapour.
The reed valve prevents reverse air flow through the system. The PAIR control valve reacts to high intake manifold vacuum and will cut
off the supply of fresh air during engine deceleration, thereby preventing after burn in the exhaust system.
No adjustments to the secondary air supply system should be made, although periodic inspection of the components is recommended.
PAIR CONTROL VALVE
PAIR CHECK VALVE
EXHAUST PORT
OXIDATION CATALYTIC CONVERTER
This motorcycle is equipped with an oxidation catalytic converter.
The oxidation catalytic converter is in the exhaust system. Through chemical reactions, it converts HC and CO in the engine's exhaust
to carbon dioxide (CO
) and water vapour.
2
NOISE EMISSION CONTROL SYSTEM
TAMPERING WITH THE NOISE EMISSION CONTROL SYSTEM IS PROHIBITED: Local law prohibits the following acts or the causing
thereof: (1) The removal or rendering inoperative by any person, other than for the purpose of maintenance, repair or replacement, of
any device or element of design incorporated into any vehicle for the purpose of noise control prior to its sale or delivery to the ultimate
customer or while it is in use: or (2) the use of any vehicle after such device or element of design has been remove or rendered inop-
erative by any person.
AMONG THOSE ACTS PRESUMED TO CONSTITUTE TAMPERING ARE THE ACTS LISTED BELOW:
1. Removal of or puncturing of the muffler, header pipes or any other component which conducts exhaust gases.
2. Removal of or puncturing of any parts of the intake system.
3. Lack of proper maintenance.
4. Replacing any moving parts of the vehicle, or parts of the exhaust or intake system, with parts other than those specified by the
manufacturer.
RESONATOR
AIR CHAMBER
AIR CLEANER HOUSING
GENERAL INFORMATION
FRESH AIR
EXHAUST GAS
1-23
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