2015 YAMAHA WR 250F brake

FRONT FORK
5-40
EAS2GB2199
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 5-4.
Front brake caliper Refer to “FRONT BRAKE” on page 5-13.
1 Brake hose holder 2
2 Protector 1
3 Upper bracket pinch bolts 2 Loosen.
4 Damper assembly 1 Loosen.
5 Lower bracket pinch bolts 2 Loosen.
6 Front fork leg 1
7 Reflector/Stay/Nut 1 For Canada
For installation, reverse the removal proce-
dure.

SWINGARM
5-64
EAS2GB2218
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 5-23.
Rear brake caliper Refer to “REAR BRAKE” on page 5-23.
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

6
ENGINE
ENGINE REMOVAL......................................................................................... 6-1
REMOVING THE SILENCER ..................................................................... 6-6
REMOVING THE EXHAUST PIPE 2.......................................................... 6-6
REMOVING THE DRIVE SPROCKET ....................................................... 6-6
REMOVING THE ENGINE ......................................................................... 6-7
CLEANING THE SPARK ARRESTER ....................................................... 6-7
CHECKING THE SILENCER AND EXHAUST PIPE.................................. 6-8
INSTALLING THE ENGINE........................................................................ 6-8
INSTALLING THE BRAKE PEDAL ............................................................ 6-9
INSTALLING THE DRIVE SPROCKET...................................................... 6-9
INSTALLING THE EXHAUST PIPE AND MUFFLER................................. 6-9
CAMSHAFT.................................................................................................... 6-11
REMOVING THE CAMSHAFT ................................................................. 6-13
CHECKING THE CAMSHAFT.................................................................. 6-14
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET .......... 6-15
CHECKING THE TIMING CHAIN TENSIONERS .................................... 6-15
CHECKING THE DECOMPRESSION SYSTEM...................................... 6-16
INSTALLING THE CAMSHAFTS ............................................................. 6-16
CYLINDER HEAD........................................................................................... 6-18
REMOVING THE CYLINDER HEAD........................................................ 6-20
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE) ...................... 6-20
CHECKING THE CYLINDER HEAD ........................................................ 6-20
INSTALLING THE CYLINDER HEAD ...................................................... 6-21
VALVES AND VALVE SPRINGS................................................................... 6-22
REMOVING THE VALVES ....................................................................... 6-23
CHECKING THE VALVES AND VALVE GUIDES ................................... 6-24
CHECKING THE VALVE SEATS ............................................................. 6-26
CHECKING THE VALVE SPRINGS......................................................... 6-27
CHECKING THE VALVE LIFTERS .......................................................... 6-28
INSTALLING THE VALVES ..................................................................... 6-28
CYLINDER AND PISTON............................................................................... 6-30
REMOVING THE PISTON ....................................................................... 6-31
CHECKING THE CYLINDER AND PISTON ............................................ 6-31
CHECKING THE PISTON RINGS............................................................ 6-32
CHECKING THE PISTON PIN ................................................................. 6-33
INSTALLING THE PISTON AND CYLINDER .......................................... 6-33
ELECTRIC STARTER.................................................................................... 6-35
CHECKING THE STARTER MOTOR ...................................................... 6-37
ASSEMBLING THE STARTER MOTOR .................................................. 6-38

ENGINE REMOVAL
6-4
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 5-1.
Side cover (left/right) Refer to “GENERAL CHASSIS” on page 5-1.
Air scoop (left / right) Refer to “GENERAL CHASSIS” on page 5-1.
Fuel tank Refer to “FUEL TANK” on page 8-1.
Exhaust pipe and silencer Refer to “ENGINE REMOVAL” on page 6-1.
Air filter case Refer to “THROTTLE BODY” on page 8-7.
Throttle body Refer to “THROTTLE BODY” on page 8-7.
Clutch cable Refer to “CLUTCH” on page 6-40.
Shift pedal Refer to “SHIFT SHAFT” on page 6-52.
Starter motor 1Refer to “ELECTRIC STARTER” on page 6-
35.
1 Engine guard 1
2 Brake pedal 1
3Spring 1
New
New
LS
M
8
8
7
6
13
45
New
1 12
3
2
1110
9
55 Nm (5.5 m kgf, 40 ft Ibf)T.R.

ENGINE REMOVAL
6-6
EAS2GB2229REMOVING 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.
EAS2GB2230REMOVING 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.
EAS2GB2231REMOVING 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
6-9
EAS2GB2236INSTALLING 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.
EAS2GB2237INSTALLING 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”
TIP
Tighten the nut while applying the rear brake.
ECA
NOTICE
Make sure to tighten to specification; other-
wise, it may damage the other part that is
fastened together.
3. Bend the lock washer tab to lock the nut.
4. Install:
• Drive sprocket guide
• Drive sprocket cover “1”
• Bolt (drive sprocket cover) “2”
EAS2GB2238INSTALLING THE EXHAUST PIPE AND
MUFFLER
1. Install:
•Gasket
• Exhaust pipe 1 “1”
• Nut (exhaust pipe 1) “2”
TIP
First temporarily tighten nuts to 13 Nm (1.3
m·kgf, 9.4 ft·lbf). Then retighten them to 20 Nm
(2.0 m·kgf, 14 ft·lbf). 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..
Bolt (drive sprocket cover)
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
Nut (exhaust pipe)
20 Nm (2.0 m·kgf, 14 ft·lbf)
T R..
21
New
T R..

CLUTCH
6-40
EAS2GB2267
CLUTCH
Removing the clutch
Order Part name Q’ty Remarks
Engine oilDrain.
Refer to “CHANGING THE ENGINE OIL” on
page 3-17.
Brake pedal Refer to “ENGINE REMOVAL” on page 6-1.
1 Clutch cable 1 Disconnect.
2 Clutch cover 1
3Gasket 1
4 Clutch spring 5
5 Pressure plate 1
6 Push rod 1 1
7 Circlip 1
8Washer 1
9 Bearing 1
10 Ball 1
11 Push rod 2 1
12 Friction plate 1 4
13 Clutch plate 8
New
New
New
2
3 45
(5)
(6)78961011
12
22
1
15
12
13
13
18
1920 17
16
14
13
T.R.
T.R.
T.R.
T.R.
LT
21

CLUTCH
6-42
Removing the right crankcase cover
Order Part name Q’ty Remarks
Engine guard Refer to “ENGINE REMOVAL” on page 6-1.
Engine oilDrain.
Refer to “CHANGING THE ENGINE OIL” on
page 3-17.
CoolantDrain.
Refer to “CHANGING THE COOLANT” on
page 3-10.
Brake pedal Refer to “ENGINE REMOVAL” on page 6-1.
Clutch cover Refer to “CLUTCH” on page 6-40.
1 Oil filter element cover 1
2 Oil filter element 1
3 Radiator pipe 2 1
4 Kickstarter lever 1
5 Right crankcase cover 1
6 Gaskets 1
7 Dowel pin 2
8Collar 1
For installation, reverse the removal proce-
dure.
T.R.
LS
New
New
67
2
5
4
1
7 8
New
3
LS
New
New
LS
NewNew
LT
LS