Clean Air System
Air Suction Valve Inspection
Remove the air suction valve (see Air Suction Valve Re-
Visually inspect the reeds [A] for cracks, folds, warps,
heat damage or other damage.
If there is any doubt as to the condition of the reeds, re-
place the air suction valve as an assembly.
Check the reed contact areas [B] of the valve holder for
grooves, scratches, any signs of separation from the
holder or heat damage.
If there is any doubt as to the condition of the reed contact
areas, replace the air suction valve as an assembly.
If any carbon or other foreign particles have accumulated
between the reed and the reed contact area, wash the
valve assembly clean with a high flash-point solvent.
Do not scrape off the deposits with a scraper as this
could damage the rubber, requiring replacement of
the suction valve assembly.
Air Switching Valve Removal
Never drop the air switching valve especially on a
hard surface. Such a shock to the air switching
valve can damaged it.
Remove the air cleaner housing (see Air Cleaner Housing
Removal in the Fuel System (DFI) chapter).
Disconnect the connector [A].
Disconnect the hoses [B] from the air suction valve cov-
ers, and remove the air switching valve [C].
Air Switching Valve Installation
Install the air switching valve [A] with hoses as shown.
Left Side View [B]
About 40° [C]
Install the removed parts (see appropriate chapters).
Air Switching Valve Operation Test
Refer to the Air Suction System Damage Inspection in the
Periodic Maintenance chapter.
Air Switching Valve Unit Test
Refer to the Air Switching Valve Unit Test in the Electrical
ENGINE TOP END 5-15