2014 YAMAHA YZ450F sensor

ENGINE REMOVAL
5-3
Removing the electronic parts
OrderPart nameQ’tyRemarks
Use a suitable stand to raise the front wheel
off the ground.
SeatRefer to “GENERAL CHASSIS” on page 4-1.
Side cover (left/right)Refer to “GENERAL CHASSIS” on page 4-1.
Air scoop (left / right)Refer to “GENERAL CHASSIS” on page 4-1.
Fuel tankRefer to “FUEL TANK” on page 7-1.
Air filter case cover
1Rectifier/regulator1
2ECU1
3Ignition coil1
4Condenser1
5Neutral switch1
6AC magneto lead1Disconnect.
7Crankshaft position sensor coupler1Disconnect.
8Coolant temperature sensor coupler1Disconnect.
For installation, reverse the removal proce-dure.
T.R.
T.R.
T.R.T.R.
8 3
7
6
154
2
LT

CYLINDER HEAD
5-19
EAS1SL1214
CYLINDER HEAD
Removing the cylinder head
OrderPart nameQ’tyRemarks
SeatRefer to “GENERAL CHASSIS” on page 4-1.
Side cover (left/right)Refer to “GENERAL CHASSIS” on page 4-1.
Air scoop (left / right)Refer to “GENERAL CHASSIS” on page 4-1.
Fuel tankRefer to “FUEL TANK” on page 7-1.
Exhaust pipe and silencerRefer to “ENGINE REMOVAL” on page 5-1.
Radiator hoseDisconnect.
Coolant temperature sensor couplerDisconnect.
Throttle bodyRefer to “THROTTLE BODY” on page 7-5.
CamshaftRefer to “CAMSHAFT” on page 5-11.
Upper engine bracketRefer to “ENGINE REMOVAL” on page 5-1
1Bolt (cylinder head)2
2Bolt (cylinder head)4
3Cylinder head1
4Cylinder head gasket1
5Timing chain guide (intake side)1
6Oil check bolt2
7 66
1st
2nd
Final20 Nm (2.0 m
kgf, 14 ftIbf)T.
R.
30 Nm (3.0 mkgf, 22 ftIbf)
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.
15 Nm (1.5 mkgf, 11 ftIbf)T.
R
.

AC MAGNETO
5-59
EAS1SL1272
AC MAGNETO
Removing the AC magneto
OrderPart nameQ’tyRemarks
Engine oilDrain.Refer to “CHANGING THE ENGINE OIL” on page 3-15.
SeatRefer to “GENERAL CHASSIS” on page 4-1.
Air scoop (left)Refer to “GENERAL CHASSIS” on page 4-1.
1AC magneto leadDisconnect.
2Crankshaft position sensor lead1Disconnect.
3Shift pedal1
4Left crankcase cover1
5Gaskets1
6Dowel pin2
7Holder1
8Stator assembly1
9Rotor1
10Woodruff key1
For installation, reverse the removal proce-dure.
110
2
4 7 5 8 3
96
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.
8 Nm (0.8 mkgf, 5.8 ftIbf)T.R.
8 Nm (0.8 mkgf, 5.8 ftIbf)T.R.
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.
65 Nm (6.5 mkgf, 47 ftIbf)T.R.
New
LT
6
LT
LT

AC MAGNETO
5-60
EAS1SL1273REMOVING THE AC MAGNETO
1. Remove:
• Nut (rotor) “1”
• Washers
2. Remove:
• Rotor “1”
Use the rotor puller “2” to remove the rotor.
• Woodruff key
EAS1SL1274CHECKING THE AC MAGNETO
1. Check:
• Rotor inner surface “a”
• Stator outer surface “b”
Damage  Inspect the crankshaft runout
and crankshaft bearing.
EAS1SL1275
CHECKING THE WOODRUFF KEY
1. Check:
• Woodruff key “1”
Damage  Replace.
EAS1SL1276INSTALLING THE AC MAGNETO
1. Install:
• Stator “1”
• Screw (stator) “2”
• Crankshaft position sensor “3”
• Bolt (crankshaft position sensor) “4”
• Holder “5”
• Bolt (holder) “6”
TIP
• Apply the sealant to the grommet of the AC
magneto lead.
• Tighten the stator screws using the T25 bit.
• Pass the AC magneto lead “a” through the
crankcase cover side.
Rotor puller
90890-04151
YM-04151
1
ab
Screw (stator)
8 Nm (0.8 m·kgf, 5.8ft·lbf)
LOCTITE®
Bolt (crankshaft position sensor)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
LOCTITE®
Holder
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
LOCTITE®
Three Bond No.1215®
90890-85505
T R..
T R..
26
5
4
3
4a
1
LT
LT

RADIATOR
6-2
4Radiator hose 21
5Radiator hose 31
6Radiator hose 41
7Radiator pipe 21
8Radiator breather hose1
9Left radiator1
10Radiator hose 11
11Radiator pipe 11
12Coolant temperature sensor1
For installation, reverse the removal proce-dure.
Removing the radiator
Order Part name Q’ty Remarks
11
12
New
New
New
LS
LS

7
FUEL SYSTEM
FUEL TANK...................................................................................................... 7-1
REMOVING THE FUEL TANK ................................................................... 7-2
REMOVING THE FUEL PUMP .................................................................. 7-2
CHECKING THE FUEL PUMP BODY........................................................ 7-2
INSTALLING THE FUEL PUMP ................................................................. 7-2
INSTALLING THE FUEL TANK.................................................................. 7-3
CHECKING THE FUEL PRESSURE ......................................................... 7-3
CHECKING THE DAMPER ........................................................................ 7-4
CHECKING AND REPLACING THE PROTECTOR .................................. 7-4
THROTTLE BODY............................................................................................ 7-5
CHECKING THE INJECTOR ..................................................................... 7-8
CHECKING THE THROTTLE BODY ......................................................... 7-8
CHECKING THE THROTTLE BODY JOINT .............................................. 7-8
ADJUSTING THE THROTTLE POSITION SENSOR................................. 7-9

THROTTLE BODY
7-5
EAS1SL1314
THROTTLE BODY
Removing the throttle body
OrderPart nameQ’tyRemarks
SeatRefer to “GENERAL CHASSIS” on page 4-1.
Side cover (left/right)Refer to “GENERAL CHASSIS” on page 4-1.
Air scoop (left/right)Refer to “GENERAL CHASSIS” on page 4-1.
Fuel tankRefer to “FUEL TANK” on page 7-1.
ECURefer to “ENGINE REMOVAL” on page 5-1.
Ignition coilRefer to “ENGINE REMOVAL” on page 5-1.
1Intake air temperature sensor coupler1Disconnect.
2Air filter case1
3Fuel injector coupler1Disconnect.
4Intake air pressure sensor coupler1Disconnect.
5Throttle position sensor coupler1Disconnect.
6Throttle cable cover1
7Throttle cable2
8Fuel hose1
9Exhaust pipe bracket1
2
1
6
10
11
9
8
3
7
5
4
3.5 Nm (0.35 mkgf, 2.5 ftIbf)T.R.
3.5 Nm (0.35 mkgf, 2.5 ftIbf)T.R.
7 Nm (0.7 mkgf, 5.1 ftIbf)T.R.
3.0 Nm (0.30 mkgf, 2.2 ftIbf)T.R.
10 Nm (1.0 mkgf, 7.2 ftIbf)T.R.

THROTTLE BODY
7-7
Removing the injector
OrderPart nameQ’tyRemarks
1Fuel inlet pipe1
2Injector1
3Gaskets1
4Throttle position sensor1
5Intake air pressure sensor1
For installation, reverse the removal proce-dure.
1
2 (2)
(2)5
43
T.R.3.4 Nm (0.34 mlbf) kgf, 2.5 ft
T.R.5 Nm (0.5 mlbf) kgf, 3.6 ft
T.R.3.4 Nm (0.34 mlbf) kgf, 2.5 ft