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Air Inlet Valve
The air inlet valve is essentially a check valve which allows fresh air to flow only from the air cleaner into the
exhaust port. Any air that has passed the air inlet valve is prevented from returning.
Inspect the air inlet valves in accordance with the Periodic Maintenance Chart. Also, inspect the air inlet valves
whenever stable idling cannot be obtained, engine power is greatly reduced, or there are abnormal engine
noises.
Air inlet valve removal and inspection should be done by an authorized dealer.
Valves Clearance
Valves and valve seats will be worn and need to be adjusted afer using for a period.
CAUTION
If valv
es and valve seats are not adjusted, it will eventually cause the valves remaining partly
open or no clearance, reducing performance or making noise or serious engine damage. Valve
clearance for each valve should be checked and adjusted in accordance with the Periodic
Maintenance Chart. Inspection and adjustment should be done by an authorized dealer.
Air Filter
A clogged air filter restricts
air intaking, increases fuel consumption, reduces engine power, and causes spark
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