7.11
7.12
AIR INDUCTION SYSTEM
AIR INDUCTION SYSTEM
Removing the air cut-off valve and reed valve
Seat/Right side panel
Refer to “GENERAL CHASSIS” on page
4-1.
Fuel tank
Refer to “FUEL TANK ” on page 7-1.
1
Air induction system hose (3-way joint to reso-
nator)
1
2
Resonator
1
3
Air induction system hose (air filter case to 3-
way joint)
1
4
Air induction system hose (3-way joint to air cut-
off valve)
1
5
Air induction system vacuum hose
1
6
Air cut-off valve
1
7
Reed valve assembly
1
8
Reed valve plate
1
For installation, reverse the removal proce-
dure.
10 Nm (1.0 m
l
kg, 7.2 ft Ib)
l
10 Nm (1.0 m
l
kg, 7.2 ft Ib)
l
Cracks/damage
Replace.
sssssssssssssssssssssssssssss
CHECKING THE AIR INDUCTION SYSTEM
Air injection
The air induction system burns unburned ex-
haust gases by injecting fresh air (secondary air)
into the exhaust port, reducing the emission of
hydrocarbons. When there is negative pressure
at the exhaust port, the reed valve opens, allow-
ing secondary air to flow into the exhaust port.
The required temperature for burning the un-
burned exhaust gases is approximately 600 to
700 °C.
Air cut-off valve
The air cut-off valve is operated by the intake
gas pressure through the piston valve dia-
phragm. Normally, the air cut-off valve is open to
allow fresh air to flow into the exhaust port. Dur-
ing sudden deceleration (the throttle valve sud-
denly closes), negative pressure is generated
and the air cut-off valve is closed in order to pre-
vent after-burning.
Additionally, at high engine speeds and when
the pressure decreases, the air cut-off valve au-
tomatically closes to guard against a loss of per-
formance due to self-EGR.
1. Check:
• Hoses
Loose connections
→
Connect properly.
→
• 3-way joint
Cracks/damage
→
Replace.
2. Check:
• Reed valve
• Reed valve stopper
• Reed valve seat
Cracks/damage
→
Replace the reed valve
assembly.
3. Check:
• Air cut-off valve
Cracks/damage
→
Replace.
4. Check:
• Air cut-off valve operation
Does not operate
→
Replace.
a. Blow air through the end of the air induction
system hose (3-way joint to air cut-off valve)
and check that air flows from the air cut-off
valve (to cylinder head side).
b. Install a vacuum/pressure pump to the air-cut
off valve “1” and apply negative pressure to
the valve.
c. Blow air through the end of the air induction
system hose (3-way joint to air cut-off valve)
and check that air does not flow and out
through the air cut-off valve (to cylinder head
side).
A. From the air filter case
B. To the cylinder head
C. To the intake manifold
A
B
C
A
B
C
Air cut-off valve opens
Perform step (b).
Air cut-off valve closes
Replace the air cut-off valve.
Vacuum/pressure pump gauge
set
Summary of Contents for YZF-R15
Page 1: ...2008 SERVICE MANUAL YZF R15 20P F8197 E0 ...
Page 33: ...2 14 ELECTRICAL SPECIFICATIONS Coil resistance 54 0 66 0 Fuse 20 0A Ω Fuse ...
Page 46: ...2 27 LUBRICATION POINTS AND LUBRICANT TYPES LUBRICATION DIAGRAMS A 1 2 3 4 5 6 7 ...
Page 48: ...2 29 LUBRICATION POINTS AND LUBRICANT TYPES 1 2 3 4 ...
Page 49: ...2 30 LUBRICATION POINTS AND LUBRICANT TYPES 1 Camshaft 2 Crankshaft 3 Main axle 4 Drive axle ...
Page 50: ...2 31 COOLING SYSTEM DIAGRAMS COOLING SYSTEM DIAGRAMS 1 2 3 4 1 5 7 6 4 ...
Page 52: ...2 33 CABLE ROUTING CABLE ROUTING 1 5 2 3 6 4 8 7 ...
Page 54: ...2 35 CABLE ROUTING A A B B C C A A C C B B A B C 1 2 3 4 5 4 5 6 6 7 8 9 10 11 10 11 12 12 ...
Page 56: ...2 37 CABLE ROUTING 1 2 5 4 3 ...
Page 60: ...2 41 CABLE ROUTING A A B C D E 1 2 3 4 5 6 7 8 9 10 A ...
Page 121: ...4 24 FRONT BRAKE Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 18 ...
Page 249: ...7 8 THROTTLE BODY ...
Page 250: ...7 9 AIR INDUCTION SYSTEM AIR INDUCTION SYSTEM 1 2 5 4 5 6 3 2 1 6 4 3 ...
Page 257: ......
Page 269: ...8 12 CHARGING SYSTEM 1 AC magneto 2 Rectifier regulator 3 Battery 42 Fuse ...
Page 271: ...8 14 CHARGING SYSTEM ...
Page 275: ...8 18 LIGHTING SYSTEM ...
Page 285: ...8 28 COOLING SYSTEM ...
Page 311: ...8 54 FUEL PUMP SYSTEM ...