7.11
7.12
AIR INDUCTION SYSTEM
AIR INDUCTION SYSTEM
Removing the air cut-off valve and reed valve
Order
Job/Parts to remove
Qty
Remarks
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.
1
2
3
6
7
8
4
5
T
R
.
.
10 Nm (1.0 m
l
kg, 7.2 ft Ib)
l
T
R
.
.
10 Nm (1.0 m
l
kg, 7.2 ft Ib)
l
LT
Cracks/damage
Replace.
sssssssssssssssssssssssssssss
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.
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
Содержание YZF-R15
Страница 1: ...2008 SERVICE MANUAL YZF R15 20P F8197 E0 ...
Страница 33: ...2 14 ELECTRICAL SPECIFICATIONS Coil resistance 54 0 66 0 Fuse 20 0A Ω Fuse ...
Страница 46: ...2 27 LUBRICATION POINTS AND LUBRICANT TYPES LUBRICATION DIAGRAMS A 1 2 3 4 5 6 7 ...
Страница 48: ...2 29 LUBRICATION POINTS AND LUBRICANT TYPES 1 2 3 4 ...
Страница 49: ...2 30 LUBRICATION POINTS AND LUBRICANT TYPES 1 Camshaft 2 Crankshaft 3 Main axle 4 Drive axle ...
Страница 50: ...2 31 COOLING SYSTEM DIAGRAMS COOLING SYSTEM DIAGRAMS 1 2 3 4 1 5 7 6 4 ...
Страница 52: ...2 33 CABLE ROUTING CABLE ROUTING 1 5 2 3 6 4 8 7 ...
Страница 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 ...
Страница 56: ...2 37 CABLE ROUTING 1 2 5 4 3 ...
Страница 60: ...2 41 CABLE ROUTING A A B C D E 1 2 3 4 5 6 7 8 9 10 A ...
Страница 121: ...4 24 FRONT BRAKE Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 18 ...
Страница 249: ...7 8 THROTTLE BODY ...
Страница 250: ...7 9 AIR INDUCTION SYSTEM AIR INDUCTION SYSTEM 1 2 5 4 5 6 3 2 1 6 4 3 ...
Страница 257: ......
Страница 269: ...8 12 CHARGING SYSTEM 1 AC magneto 2 Rectifier regulator 3 Battery 42 Fuse ...
Страница 271: ...8 14 CHARGING SYSTEM ...
Страница 275: ...8 18 LIGHTING SYSTEM ...
Страница 285: ...8 28 COOLING SYSTEM ...
Страница 309: ...8 52 FUEL PUMP SYSTEM 3 Battery 10 Main switch 11 ECU engine control unit 19 Fuel pump 42 Fuse 43 Stop switch ...
Страница 311: ...8 54 FUEL PUMP SYSTEM ...
Страница 312: ...8 55 ELECTRICAL COMPONENTS ELECTRICAL COMPONENTS 1 4 8 17 23 2 3 5 6 7 9 10 11 12 13 14 15 16 18 19 20 21 22 ...