MAINTENANCE
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Air Intake and Exhaust System
Fuel & Exhaust Detecting System
Fuel & exhaust system optimization is detected by oxygen
sensors
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� An oxygen sensor installed on each exhaust pipe
detects air & fuel combustion condition by measuring oxygen
density and transferring it as an electrical signal to the ECU� If
the ECU determines that combustion is not optimal, it will make
adjustments to fuel injection in accordance with signals from the
TPS and Intake Air Temperature sensors� By this way, the ratio
of air against fuel can be optimized for complete combustion�
Air Intake Valve
An air intake valve is essentially a valve which allows fresh air to flow only from the air filter into the
engine� Any air that passes through the air intake valve is prevented from returning� Have a dealer inspect
the air intake valves in accordance with the Periodic Maintenance Chart� Also, have the air intake valves
inspected whenever stable idling cannot be obtained, engine power is greatly reduced, or there are
abnormal engine noises�
Air intake valve removal and inspection should only be performed by an authorized CFMOTO dealer�
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