5-14 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
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).
Stick Coil Connector [A]
Air Switching Valve Connector [B]
Turn up the heat insulation rubber plate [A] forward.
Disconnect the hoses [B] from the air suction valve cov-
ers, and remove the air switching valve [C].