3. INSPECTION/ADJUSTMENT MXU 250R/300R
SECONDARY AIR SUPPLY Vacuum Hose AICV Control solenoid Valve
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 cover.
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 PAIR Check Valve Air Supply Hose
carbon dioxide and water.
Check the AICV (air injection control valve)
hoses between the AICV control solenoid
valve and cylinder head cover 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.
Ignition Coil Cap Spark Plug
SPARK PLUG
Remove ignition coil cap and spark plug.
Check the spark plug for wear and fouling
deposits.
Clean any fouling deposits with a spark
plug cleaner or a wire brush.
Specified Spark Plug: DPR7EA-9
3-7
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