When the engine is running, the air intake valve is lifting up.
If the valve does not operate properly, check the air intake solenoid valve hoses for leak.
If there are no leaks, check the air intake solenoid valve.

Air Intake Solenoid Valve Unit TestSeat Cover Removal
Remove:
Rear Seat (see Rear Seat Removal)
Remove the bolts [A].
Remove the upper seat cover backward [B] to clear the
hook portions.
Remove:
Front Seat (see Front Seat Removal)
Quick Rivets [A]
Bolts [B]
Seat Covers [C]
...
Intake Air Temperature Sensor Removal
NOTICE
Never drop the intake air temperature sensor especially
on a hard surface. Such a shock to the sensor
can damage it.
Remove the fuel tank (see Fuel Tank Removal in the Fuel
System (DFI) chapter).
Disconnect the connector [A] from the intake air temperature
sensor.
Remove the da ...
KIBS System Circuit
1. Ignition Switch
2. Front Wheel Rotation Sensor
3. Front Brake Light Switch
4. Joint Connector C
5. Joint Connector D
6. ECU
7. Rear Wheel Rotation Sensor
8. Rear Brake Light Switch
9. Battery 12 V 8.6 Ah
10. Main Fuse 30 A
11. KIBS Motor Relay Fuse 30 A
12. KIBS Solenoid Valve Rela ...