5-12 ENGINE TOP END
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
Fuel Tank (see Fuel Tank Removal in the Fuel System
Air Cleaner Housing (see Air Cleaner Housing Removal
in the Fuel System (DFI) chapter)
Disconnect the connector [A] and hoses [B] to remove the
air switching valve [C].
Never drop the air switching valve, especially on a
hard surface. Such a shock to the valve can dam-
Air Switching Valve Installation
Installation is the reverse of removal.
Install the air switching valve hoses so that the white paint
marks [A] are located as shown in the figure.
[B] View from Top
Run the hoses and lead correctly (see Cable, Wire, and
Hose Routing section in the Appendix chapter).
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