2016 YAMAHA YZ450F brake

HANDLEBAR
4-32
EASB111160
HANDLEBAR
Removing the handlebar
Order Part name Q’ty Remarks
Number plate Remove the band only.
1 Clutch cable 1 Disconnect.
2 Clutch lever holder 1
3 Engine stop switch 1
4 Launch control switch 1
5 Brake master cylinder 1
6 Throttle cable cap 1
7 Throttle cable (pull) 1 Disconnect.
8 Throttle cable (return) 1 Disconnect.
9 Right grip 1
10 Tube guide 1
11 Collars 1
12 Left grip 1
13 Handlebar upper holder 2

HANDLEBAR
4-37
10.Install:
• Rubber cover “1”
• Cover (throttle cable housings) “2”
11.Install:
• Front brake master cylinder assembly “1”
• Front brake master cylinder holder “2”
• Bolt (brake master cylinder holder) “3”
TIP
• Install the brake master cylinder holder with
the “UP” mark facing up.
• Install in order for the top of the front brake
master cylinder assembly to be level.
• First, tighten the upper bolt, then the lower
bolt.
12.Install:
• Clutch cable “1”
TIP
Before installation, apply the lithium-soap-
based grease to the clutch cable end.13.Adjust:
• Clutch lever free play
Refer to “ADJUSTING THE CLUTCH LE-
VER FREE PLAY” on page 3-11.
14.Adjust:
• Throttle grip free play
Refer to “ADJUSTING THE THROTTLE
GRIP FREE PLAY” on page 3-11. Front brake master cylinder hold-
er bolt
9 Nm (0.9 m·kgf, 6.5 ft·lbf)
T R..
Clutch lever free play
7.0–12.0 mm (0.28–0.47 in)
Throttle grip free play
3.0–5.0 mm (0.12–0.20 in)
1LS

FRONT FORK
4-38
EASB111164
FRONT FORK
Removing the front fork legs
Order Part name Q’ty Remarks
Use a suitable stand to raise the front wheel
off the ground.
Front wheel Refer to “FRONT WHEEL” on page 4-3.
Front brake caliper Refer to “FRONT BRAKE” on page 4-12.
Number plate Refer to “GENERAL CHASSIS” on page 4-1.
1 Protector 1
2 Upper bracket pinch bolts 2 Loosen.
3 Damper assembly 1 Loosen.
4 Lower bracket pinch bolts 2 Loosen.
5 Front fork leg 1
For installation, reverse the removal proce-
dure.
3
2
4
5
1
T.R.21 Nm (2.1 mlbf) kgf, 15 ft
T.R.9 Nm (0.9 mlbf) kgf, 6.5 ft
T.R.5 Nm (0.5 mlbf) kgf, 3.6 ftT.R.5 Nm (0.5 mlbf) kgf, 3.6 ft

SWINGARM
4-62
EASB111183
SWINGARM
Removing the swingarm
Order Part name Q’ty Remarks
Use a suitable stand to raise the front wheel
off the ground.
Brake hose holder Refer to “REAR BRAKE” on page 4-22.
Rear brake caliper Refer to “REAR BRAKE” on page 4-22.
Bolt (brake pedal)
Drive chain
1Collars 2
2Oil seals 2
3Thrust bearing 2
4Bushing 2
5Oil seals 2
6Bearing 4
For installation, reverse the removal proce-
dure.
1
2
3
6
4
6
4
1
3
6
2
5
T.R.70 Nm (7.0 mlbf) kgf, 51 ft
T.R.4.0 Nm (0.40 mlbf) kgf, 2.9 ft

5
ENGINE
ENGINE REMOVAL......................................................................................... 5-1
REMOVING THE SILENCER ..................................................................... 5-6
REMOVING THE EXHAUST PIPE 2.......................................................... 5-6
REMOVING THE DRIVE SPROCKET ....................................................... 5-6
REMOVING THE ENGINE ......................................................................... 5-7
CHECKING THE SILENCER AND EXHAUST PIPE.................................. 5-7
CHANGING THE SILENCER FIBER ......................................................... 5-7
INSTALLING THE ENGINE........................................................................ 5-8
INSTALLING THE BRAKE PEDAL ............................................................ 5-9
INSTALLING THE DRIVE SPROCKET...................................................... 5-9
INSTALLING THE EXHAUST PIPE AND MUFFLER............................... 5-10
CAMSHAFT.................................................................................................... 5-12
REMOVING THE CAMSHAFT ................................................................. 5-14
CHECKING THE CAMSHAFT.................................................................. 5-15
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET .......... 5-16
CHECKING THE TIMING CHAIN TENSIONERS .................................... 5-16
CHECKING THE DECOMPRESSION SYSTEM...................................... 5-17
INSTALLING THE CAMSHAFTS ............................................................. 5-17
CYLINDER HEAD........................................................................................... 5-20
REMOVING THE CYLINDER HEAD........................................................ 5-22
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE) ...................... 5-22
CHECKING THE CYLINDER HEAD ........................................................ 5-22
INSTALLING THE CYLINDER HEAD ...................................................... 5-23
VALVES AND VALVE SPRINGS................................................................... 5-25
REMOVING THE VALVES ....................................................................... 5-26
CHECKING THE VALVES AND VALVE GUIDES ................................... 5-27
CHECKING THE VALVE SEATS ............................................................. 5-28
CHECKING THE VALVE SPRINGS......................................................... 5-30
CHECKING THE VALVE LIFTERS .......................................................... 5-31
INSTALLING THE VALVES ..................................................................... 5-31
CYLINDER AND PISTON............................................................................... 5-33
REMOVING THE PISTON ....................................................................... 5-34
CHECKING THE CYLINDER AND PISTON ............................................ 5-34
CHECKING THE PISTON RINGS............................................................ 5-35
CHECKING THE PISTON PIN ................................................................. 5-36
INSTALLING THE PISTON AND CYLINDER .......................................... 5-36

ENGINE REMOVAL
5-4
Removing the engine
Order Part name Q’ty Remarks
Use a suitable stand to raise the front wheel
off the ground.
Seat Refer 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.
Rear fender Refer to “GENERAL CHASSIS” on page 4-1.
Fuel tank Refer to “FUEL TANK” on page 7-1.
Exhaust pipe and silencer Refer to “ENGINE REMOVAL” on page 5-1.
Air filter case Refer to “THROTTLE BODY” on page 7-5.
Throttle body Refer to “THROTTLE BODY” on page 7-5.
Clutch cable Refer to “CLUTCH” on page 5-38.
Shift pedal Refer to “SHIFT SHAFT” on page 5-50.
1 Engine guard 1
2 Brake pedal 1
3Spring 1
4 Cylinder head breather hose 1

ENGINE REMOVAL
5-6
EASB111196REMOVING THE SILENCER
1. Remove:
• Rear shock absorber assembly lower bolt
“1”
• Connecting arm bolt (frame side) “2”
• Silencer “3”
TIP
Move the rear shock absorber to the left side of
the chassis, and remove the silencer.
EASB111197REMOVING THE EXHAUST PIPE 2
1. Remove:
• Exhaust pipe 2
TIP
Put the Exhaust pipe 2 into the state as shown
by moving this, and then remove it.
EASB111198REMOVING THE DRIVE SPROCKET
1. Straighten the lock washer tab.
2. Remove:
• Nut (drive sprocket) “1”
• Lock washer “2”
TIP
Loosen the nut while applying the rear brake.
3. Remove:
• Drive sprocket “1”
• Drive chain “2”
TIP
Remove the drive sprocket together with the
drive chain.
1 2
3

ENGINE REMOVAL
5-9
• Front engine bracket “4”
• Engine bracket bolt (front side) “5”
• Engine mounting bolt (front side) “6”
•Patch “7”
• Upper engine bracket “8”
• Engine bracket bolt (upper side) “9”
• Engine mounting bolt (upper side) “10”
TIP
• Apply molybdenum disulfide grease to the
pivot shaft.
• Install the patch with the claw “a” facing inside
the chassis.
EASB111203
INSTALLING THE BRAKE PEDAL
1. Install:
• Spring “1”
• Brake pedal “2”
• O-rings “3”
• Bolt (brake pedal) “4”
• Clip “5”
TIP
Apply the lithium-soap-based grease on the
bolt, O-rings and brake pedal bracket.
EASB111204INSTALLING THE DRIVE SPROCKET
1. Install:
• Drive sprocket “1”
• Drive chain “2”
TIP
Install the drive sprocket together with the drive
chain.
2. Install:
• Lock washer “1”
• Nut (drive sprocket) “2” Engine bracket bolt (front side)
34 Nm (3.4 m·kgf, 25 ft·lbf)
Engine mounting bolt (front side)
55 Nm (5.5 m·kgf, 40 ft·lbf)
Engine bracket bolt (upper side)
36 Nm (3.6 m·kgf, 26 ft·lbf)
Engine mounting bolt (upper
side)
45 Nm (4.5 m·kgf, 33 ft·lbf)
T R..
T R..
T R..
T R..
M
87 9
10
10 9
87
4 1
a
2
43
5
56
Bolt (brake pedal)
26 Nm (2.6 m·kgf, 19 ft·lbf)
Nut (drive sprocket)
75 Nm (7.5 m·kgf, 54 ft·lbf)
New
T R..
1 2
3
45
LS
New
T R..