2014 YAMAHA YZ250F Owners Manual

FRONT WHEEL
4-5
EAS1SM1125DISASSEMBLING THE FRONT WHEEL
1. Remove:
• Oil seals
• Bearing
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Clean the outside of the front wheel hub.
b. Remove the oil seals “1” with a flat-head
screwdriver.
TIP
To prevent damaging the wheel, place a rag “2”
between the screwdriver and the wheel sur-
face.
c. Remove the bearings with a bearing puller.
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EAS1SM1126ASSEMBLING THE FRONT WHEEL
1. Install:
• Bearing (left side) “1”
• Spacer “2”
• Bearing (right side) “3”
• Oil seals “4”
TIP
• Apply the lithium soap base grease to the
bearing and the oil seal lip when installing.
• Left side of bearing shall be installed first.
• Install the oil seal with its manufacture’s
marks or numbers facing outward.
ECA1DX1005
NOTICE
Install the bearing by pressing its outer race
parallel.
TIP
Use a socket “1” that matches the diameter of
the bearing outer race and that of the oil seal.
2. Install:
• Brake disc “1”
• Brake disc bolt “2”
TIP
Tighten the bolts in stages and in a crisscross
pattern.
12
New
Brake disc bolt
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
LOCTITE®
4
3
2
1
4
New
New
1
T R..

FRONT WHEEL
4-6
3. Install:
• Collar “1”
TIP
Apply the lithium soap base grease on the oil
seal lip.
EAS1SM1127INSTALLING THE FRONT WHEEL
1. Install:
• Front wheel
TIP
Install the brake disc “1” between the brake
pads “2” correctly.
2. Install:
• Front wheel axle “1”
TIP
Apply the lithium soap base grease to the front
wheel axle.3. Tighten:
• Front wheel axle nut “1”
ECA14140
NOTICE
Before tightening the front wheel axle nut,
push down hard on the handlebar(s) several
times and check if the front fork rebounds
smoothly.
4. Tighten:
• Front wheel axle pinch bolt “1”
1
LS
Front wheel axle nut
115 Nm (11.5 m·kgf, 83 ft·lbf)
Front wheel axle pinch bolt
21 Nm (2.1 m·kgf, 15 ft·lbf)
T R..
1
T R..
1 1

REAR WHEEL
4-7
EAS1SM1128
REAR WHEEL
Removing the rear wheel
Order Part name Q’ty Remarks
Use a suitable stand to raise the rear wheel
off the ground.
1 Nut (rear wheel axle) 1
2 Rear wheel axle 1
3 Drive chain puller 2
4 Rear wheel 1
5Collars 2
6 Rear wheel sprocket 1
7Oil seals 2
8 Circlip 1
9 Bearing 3
10 Brake disc 1
For installation, reverse the removal proce-
dure.
(6)
21 Nm (2.1 m•kgf, 15 ft•Ibf)T.R.
2 5
7 9
LS
LS(6)
46
1
(6) 3
LS
8
9 10
7 5
LT
14 Nm (1.4 m•kgf, 10 ft•Ibf)T.R.
3
21 Nm (2.1 m•kgf, 15 ft•Ibf)T.R.
42 Nm (4.2 m•kgf, 30 ft•Ibf)T.R.
135 Nm (13.5 m•kgf, 98 ft•lbf)T.R.

REAR WHEEL
4-8
EAS1SM1129REMOVING THE REAR WHEEL
1. Use a suitable stand to raise the rear wheel
off the ground.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
2. Remove:
• Rear wheel axle nut “1”
3. Loosen:
• Locknut “2”
4. Tighten:
• Adjusting bolt “3”
5. Remove:
• Rear wheel axle
• Rear wheel
TIP
• Push the rear wheel forward and remove the
drive chain from the rear wheel sprocket.
• Do not depress the brake pedal with the rear
wheel removed.
EAS1SM1130CHECKING THE REAR WHEEL
1. Check:
• Rear wheel axle
• Rear wheel
• Bearing
• Oil seals
Refer to “CHECKING THE FRONT WHEEL”
on page 4-4.
2. Check:
•Tire (s)
• Rear wheel
Damage/wear  Replace.
Refer to “CHECKING THE TIRES” on page
3-32 and “CHECKING THE WHEELS” on
page 3-33.
3. Check:
• Spokes
Refer to “CHECKING THE FRONT WHEEL”
on page 4-4.4. Measure:
• Radial wheel runout
• Lateral wheel runout
Refer to “CHECKING THE FRONT WHEEL”
on page 4-4.
EAS1SM1131DISASSEMBLING THE REAR WHEEL
1. Remove:
• Oil seals
• Bearing
Refer to “DISASSEMBLING THE FRONT
WHEEL” on page 4-5.
EAS1SM1132CHECKING AND REPLACING THE REAR
WHEEL SPROCKET
1. Check:
• Rear wheel sprocket
More than 1/4 tooth wear “a”  Replace the
rear wheel sprocket and the drive sprocket
as a set.
Bent tooth  Replace the rear wheel
sprocket and the drive sprocket as a set.
2. Replace:
• Rear wheel sprocket
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a. Remove the self-locking nuts and the rear
wheel sprocket.
b. Clean the rear wheel drive hub with a clean
cloth, especially the surfaces that contact
the sprocket.
c. Install the new rear wheel sprocket.
3
12
Radial wheel runout limit
2.0 mm (0.08 in)
Lateral wheel runout limit
2.0 mm (0.08 in)
b. Correct
1. Drive chain roller
2. Rear wheel sprocket
Rear wheel sprocket self-locking
nut
42 Nm (4.2 m·kgf, 30 ft·lbf)
T R..

REAR WHEEL
4-9
TIP
Tighten the self-locking nuts in stages and in a
crisscross pattern.
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EAS1SM1133ASSEMBLING THE REAR WHEEL
1. Install:
• Bearing (right side) “1”
• Circlip “2”
• Spacer “3”
• Bearing (left side) “4”
• Oil seals “5”
TIP
• Apply the lithium soap base grease to the
bearing and the oil seal lip when installing.
• Install the bearing with seal facing outward.
• Right side of bearing shall be installed first.
• Install the oil seal with its manufacture’s
marks or numbers facing outward.
ECA1DX1006
NOTICE
Install the bearing by pressing its outer race
parallel.
TIP
Use a socket “1” that matches the diameter of
the bearing outer race and that of the oil seal.2. Install:
• Brake disc “1”
• Brake disc bolt “2”
TIP
Tighten the bolts in stages and in a crisscross
pattern.
3. Install:
• Collar “1”
TIP
Apply the lithium soap base grease on the oil
seal lip.
EAS1SM1134INSTALLING THE REAR WHEEL
1. Install:
• Rear wheel
New
New
5
43 1
25
LSLS
Brake disc bolt
14 Nm (1.4 m·kgf, 10 ft·lbf)
LOCTITE®
1
T R..
1
LS

REAR WHEEL
4-10
TIP
Install the brake disc “1” between the brake
pads “2” correctly.
2. Install:
• Drive chain “1”
TIP
Push the rear wheel “2” forward and install the
drive chain.
3. Install:
• Left drive chain puller “1”
• Rear wheel axle “2”
TIP
• Install the left drive chain puller, and insert the
rear wheel axle from the left side.
• Apply the lithium soap base grease to the rear
wheel axle.
4. Install:
• Right drive chain puller “1”
• Washer “2”
• Rear wheel axle nut “3”
TIP
Temporarily tighten the nut (rear wheel axle) at
this point.
5. Adjust:
• Drive chain slack “a”
Refer to “ADJUSTING THE DRIVE CHAIN
SLACK” on page 3-27.
6. Tighten:
• Rear wheel axle nut “1”
• Locknut “2”
1 2
LS
Drive chain slack
50–60 mm (1.97–2.36 in)
Wheel axle nut
135 Nm (13.5 m·kgf, 98 ft·lbf)
Locknut
21 Nm (2.1 m·kgf, 15 ft·lbf)
2
1
3
a
T R..
T R..
1
2

FRONT BRAKE
4-11
EAS1SM1135
FRONT BRAKE
Removing the front brake caliper
Order Part name Q’ty Remarks
Brake fluidDrain.
Refer to “BLEEDING THE BRAKE SYSTEM”
on page 3-21.
1 Union bolt 1
2 Copper washers 2
3 Front brake hose 1
4 Brake pad pin plug 1
5 Brake pad pin 1
6 Brake pads 2
7 Brake pad spring 1
8 Front brake caliper assembly 1
9 Front brake caliper bracket 1
For installation, reverse the removal proce-
dure.
3
9
1
2
8
4
5 7
6
T.R.30 Nm (3.0 mlbf) kgf, 22 ft
T.R.28 Nm (2.8 mlbf) kgf, 20 ft
T.R.17 Nm (1.7 mlbf) kgf, 12 ft
T.R.2.5 Nm (0.25 mlbf) kgf, 1.8 ft
T.R.6 Nm (0.6 mlbf) kgf, 4.3 ft

FRONT BRAKE
4-12
Disassembling the front brake caliper
Order Part name Q’ty Remarks
1 Brake caliper piston 2
2 Brake caliper piston dust seal 2
3 Brake caliper piston seal 2
4 Bleed screw 1
For assembly, reverse the disassemble pro-
cedure.
12
34
S
S
BF
BF
T R..6 Nm (0.6 m kgf, 4.3 ft Ibf)