Clean Air System (US, CH, AT, KR, C2 ∼ CA, DE & C6 ∼ EUR, FR)
Air Suction Valve Installation
Install the valve assembly [A] between the cylinder head
cover and the cap.
Tighten the cap bolts.
Torque - Air Suction Valve Cover Bolts: 11 N·m (1.1 kgf·m,
Vacuum Switch Valve Installation
Install the switch valve so that the air hole [A] faces down-
Air Suction Valve Inspection
The air suction valve is essentially a check valve which
allows fresh air to flow from the air cleaner into the exhaust
port. Any air that has passed the air suction valve is pre-
vented from returning to the air cleaner.
Remove the air suction valves.
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 reed, replace
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.
Clean Air System Hose Inspection
Be certain that all the hoses are routed without being flat-
tened or kinked, and are connected correctly to the air
cleaner housing, silencer, vacuum switch valve, carbure-
tors, and air suction valve covers.
If they are not, correct them. Replace them if they are
ENGINE TOP END 4-9