Air Injection System: Operation: Notes

When the air injection system is operating, pulsation created by exhaust gas leaving the engine is transmitted to the air suction valve through an air suction pipe.

When negative pressure from exhaust pulsation reaches suction valve, reeds in suction valve are drawn open and fresh air from the air cleaner is drawn into exhaust passage.

When positive pressure is present in exhaust, reeds are closed to prevent reverse flow of exhaust gas.