Induction System Inspection; Air Injection; Air Switching Valve - Yamaha FZ-16 Service Manual

INDUCTION SYSTEM INSPECTION

AIR

Air injection

The air induction system burning gases
unburned exhaust by injecting
fresh air (secondary air) at the port of
exhaust, reducing the emission of hydrocarbons.
When there is negative pressure in the port
exhaust valve plates is opened, allowing
secondary air into the exhaust port.
The temperature required to burn the gases
unburnt exhaust is approximately
600 to 700 ° C.

Air Switching Valve

The air shutoff valve is operated by the
inlet gas pressure through
valve diaphragm piston. Typically,
cutting the valve opens to allow air
ue the fresh air into the exhaust port.
During a sudden deceleration (valve
throttle suddenly closes), the pressure
negative is generated, and the air shut-off valve
closes to prevent combustion
retarded. In addition, at high speed and when
pressure decreases, the air shut-off valve
closes automatically to protect
from a performance loss due to self
Exhaust Gas Recirculation (EGR).
A
A. From the air filter box
B. Air flow to the exhaust port
C. To the intake manifold
1. Check:
• Hoses:
Loose
C
B
Connect correctly.
AIR INDUCTION SYSTEM
Cracks / damage Replace.
•
Union 3-way
Cracks / damage Replace.
2. Check:
•
Reed valve
•
Valve stop reed
•
Valve seat sheet
Cracks / damage Replace valve
plates.
3. Check:
•
Air shutoff valve
Cracks / damage Replace.
4. Check:
•
Operation of the air shutoff valve
Replace does not work.
a.
Blowing air through the hose end
the air induction system (union of 3
ways to cut air valve) and check that
the air flow from the air shutoff valve
(Towards the butt).
Air shutoff valve is opened
Perform step (b).
Air shutoff valve closed
Replace the air shutoff valve.
b.
Install pump pressure / vacuum in the
air shutoff valve "1" and apply
negative pressure to the valve.
Gauge
c.
Blowing air through the end of the
hose air induction system
(3-way junction to the air shutoff valve)
and check that no air flow and exit through
of the air shutoff valve (toward the stock).
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