Clean Air System
Air Switching Valve Removal
Fuel Tank (see Fuel System Chapter)
Pull off the hoses [A] and air switching valve connector
[B], and take out the air switching valve [C].
Air Switching Valve Installation
Install the air switching valve [A] so that the connector [B]
Route the hoses correctly (see Appendix chapter).
Air Switching Valve Operation Test
Pull the air switching hose [A] out of the right air cleaner
Start the engine and run it at idle speed.
Plug the air switching hose end with your finger and feel
vacuum pulsing in the hose.
If there is no vacuum pulsation, check the hose line for
leak. If there is no leak, check the air switching valve (see
Air Switching Valve Unit Test).
Apply a soap and water solution or rubber lubricant to
the end of the air switching hose [A] and put the hose
into the right air cleaner base [B] with the white mark [C]
faced forward until the white mark aligns with the top of
the grommet [D].
Air Switching Valve Unit Test
Remove the air switching valve. (see Air Switching Valve
Set the hand tester [A] to the × 25 Ω range and wire it to
the air switching valve terminals as shown.
Special Tool - Hand Tester: 57001-1394
Air Switching Valve Resistance
22 Ω at 20°C (68 °F)
If the resistance reading is except the specified value, re-
place it with a new one.
ENGINE TOP END 5-15