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ENGINE TOP END 5-11
Clean Air System
Vacuum Switch Valve Test
•
Remove:
Fuel Tank (see Fuel System (DFI) chapter)
Vacuum Switch Valve
•
Connect a vacuum gauge [A] and syringe [B] or fork oil
level gauge to the vacuum hoses as shown.
Special Tool - F ork Oil Level Gauge: 57001–1290
Air Fl ow [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.
Spring [A]
Diaphragm [B]
Valve [C]
Low Vacuum [D]
Secondary Air Flow [E]
If the vacuum switch valve does not operate as described,
replace it with a new one.
NOTE
○
To check air flow through the vacuum switch valve, just
blow through the air cleaner hose.
Vacuum Switch Valve Closing Pressure (Open → Close)
Standard: 45 ∼ 53 kPa (340 ∼ 400 mmHg, 6.5 ∼ 7.7 psi)
High Vacuum [A]
Secondary air cannot flow [B]
Clean Air System Hose Inspection
•
Be certain that all the hoses are routed without being flat-
tened or kinked, and are connected correctly to the air
cleaner housing, vacuum switch valve, #1 and #4 carbu-
retor holders and air suction valve covers.
If they are not, correct them. Replace them if they are
damaged.