3. INSPECTION/ADJUSTMENT
3-8
MXU 500
SECONDARY AIR SUPPLY
SYSTEM
This model is equipped with a built-in
secondary air supply system. The pulse
secondary air supply system is located on
the cylinder head.
The secondary air supply system introduces
filtered air into exhaust gases in the exhaust
port. The secondary air is drawn into the
exhaust port whenever there is negative
pressure pulse in the exhaust system. This
charged secondary 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.
Check the AICV (air injection control valve)
hoses between the AICV control solenoid
valve and cylinder head for deterioration,
damage or loose connections. Make sure the
hoses are not cracked.
If the hoses show any signs of heat damage,
inspect the AICV check valve in the AICV
reed valve cover damage.
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