5-16 ENGINE TOP END
Clean Air System
Vacuum Switch Valve Removal
Remove the fuel tank (see Fuel Tank Removal in the Fuel
System (DFI) chapter).
Pull off the hoses [A] and take out the vacuum switch
Vacuum Switch Valve Installation
Install the vacuum switch valve [A] so that the inlet vac-
uum hose [B] faces rear side.
Route the hoses correctly (see Cable, Wire, and Hose
Routing section in the Appendix chapter).
Vacuum Switch Valve Operation Test
Refer to the Air Suction System Damage Inspection in the
Periodic Maintenance chapter.
Vacuum Switch Valve Unit Test
Remove the vacuum switch valve (see Vacuum Switch
Valve Removal in this section).
Connect a commercially available vacuum gauge [A] and
syringe [B] (or fork oil level gauge) to the vacuum hoses
Special Tool - Fork Oil Level Gauge: 57001-1290
Air Flow [C]
Gradually raise the vacuum (lower the pressure) applied
to the vacuum switch valve, and check the valve opera-
tion. When the vacuum is low, the vacuum switch valve
should permit air to flow. When the vacuum raises to
valve closing pressure, it should stop air flow.
Low Vacuum [D]
Secondary air flows [E].