2006 YAMAHA WR 250F wheel

MAINTENANCE SPECIFICATIONS
2 - 13
SPEC
Wheel: USA, CDN, ZA EUROPE, AUS, NZ
Front wheel type Spoke wheel← ----
Rear wheel type Spoke wheel← ----
Front rim size/material 21 × 1.60/Aluminum← ----
Rear rim size/material 18 × 1.85/Aluminum 18 × 2.15/Aluminum ----
Rim runout limit:
Radial ---- ---- 2.0 mm
(0.08 in)
Lateral ---- ---- 2.0 mm
(0.08 in)
Drive chain:
Type/manufacturer DID520VM/DAIDO ----
Number of links 113 links + joint ----
Chain slack 48 ~ 58 mm (1.9 ~ 2.3 in) ----
Chain length (15 links) ---- 239.3 mm
(9.42 in)
Front disc brake:
Disc outside dia. × Thickness 250 × 3.0 mm (9.84 × 0.12 in)
250 × 2.5 mm
(9.84 × 0.10 in)
Pad thickness 4.4 mm (0.17 in) 1.0 mm
(0.04 in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 27.0 mm (1.063 in) × 2 ----
Brake fluid type DOT #4 ----
Rear disc brake:
Disc outside dia. × Thickness 245 × 4.0 mm (9.65 × 0.16 in)
245 × 3.5 mm
(9.65 × 0.14 in)
Deflection limit ---- 0.15 mm
(0.006 in)
Pad thickness 6.4 mm (0.25 in) 1.0 mm
(0.04 in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 25.4 mm (1.000 in) × 1 ----
Brake fluid type DOT #4 ----
Brake lever and brake pedal:
Brake lever position 95 mm (3.74 in) ----
Brake pedal height
(vertical height above footrest top)5 mm (0.20 in) ----
Clutch lever free play (lever end) 8 ~ 13 mm (0.31 ~ 0.51 in) ----
Throttle grip free play 3 ~ 5 mm (0.12 ~ 0.20 in) ----Item Standard Limit

MAINTENANCE SPECIFICATIONS
2 - 14
SPEC
NOTE:
1. First, tighten the steering ring nut approximately 38 Nm (3.8 m  kg, 27 ft  lb) by using the steer-
ing nut wrench, then loosen the steering ring nut one turn.
2. Retighten the steering ring nut 7 Nm (0.7 m  kg, 5.1 ft  lb). Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Upper bracket and outer tube M8 × 1.25 4 23 2.3 17
Lower bracket and outer tube M8 × 1.25 4 20 2.0 14
Upper bracket and steering stem M24 × 1.0 1 145 14.5 105
Handlebar upper holder and handlebar lower
holderM8 × 1.25 4 28 2.8 20
Handlebar lower holder and upper bracket M12 × 1.25 2 40 4.0 29
Steering stem and steering ring nut M28 × 1.0 1 Refer to NOTE.
Front fork and front fork cap bolt M51 × 1.5 2 30 3.0 22
Front fork and base valve M30 × 1.0 2 55 5.5 40
Front fork cap bolt and damper rod M12 × 1.25 2 29 2.9 21
Front fork bleed screw and front fork cap bolt M5 × 0.8 2 1 0.1 0.7
Front fork and front fork protector M6 × 1.0 6 7 0.7 5.1
Front fork protector and brake hose holder M6 × 1.0 2 7 0.7 5.1
Throttle grip cap M5 × 0.8 2 4 0.4 2.9
Front brake master cylinder M6 × 1.0 2 9 0.9 6.5
Brake lever mounting bolt M6 × 1.0 1 6 0.6 4.3
Brake lever mounting nut M6 × 1.0 1 6 0.6 4.3
Brake lever position locknut M6 × 1.0 1 5 0.5 3.6
Front brake hose guide and front brake hose
guide bracketM5 × 0.8 1 4 0.4 2.9
Front brake hose guide and lower bracket M6 × 1.0 1 4 0.4 2.9
Clutch lever holder M5 × 0.8 2 4 0.4 2.9
Clutch lever mounting nut M6 × 1.0 1 4 0.4 2.9
Hot starter lever holder M5 × 0.8 2 4 0.4 2.9
Hot starter lever mounting nut M5 × 0.8 1 2 0.2 1.4
Front brake master cylinder cap M4 × 0.7 2 2 0.2 1.4
Front brake hose union bolt M10 × 1.25 2 30 3.0 22
Front brake caliper M8 × 1.25 2 23 2.3 17
Front brake caliper and brake hose holder M6 × 1.0 1 10 1.0 7.2
Pad pin plug M10 × 1.0 2 3 0.3 2.2
Front brake caliper and pad pin M10 × 1.0 1 18 1.8 13
Rear brake caliper and pad pin M10 × 1.0 1 18 1.8 13
Brake caliper and bleed screw M8 × 1.25 2 6 0.6 4.3
Front wheel axle and axle nut M16 × 1.5 1 90 9.0 65
Front wheel axle holder M8 × 1.25 4 23 2.3 17
Front brake disc M6 × 1.0 6 12 1.2 8.7
Rear brake disc M6 × 1.0 6 14 1.4 10
Brake pedal M8 × 1.25 1 26 2.6 19
Rear brake master cylinder M6 × 1.0 2 10 1.0 7.2
Rear brake master cylinder cap M4 × 0.7 2 2 0.2 1.4
Rear brake hose union bolt M10 × 1.25 2 30 3.0 22
Rear wheel axle and axle nut M20 × 1.5 1 125 12.5 90

MAINTENANCE SPECIFICATIONS
2 - 15
SPEC
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Nipple (spoke)—72 3 0.3 2.2
Rear wheel sprocket M8 × 1.25 6 50 5.0 36
Rear brake disc cover M6 × 1.0 2 7 0.7 5.1
Rear brake caliper protector M6 × 1.0 2 7 0.7 5.1
Drive chain puller adjust bolt and locknut M8 × 1.25 2 16 1.6 11
Engine mounting:
Engine and engine bracket (front) M10 × 1.25 1 69 6.9 50
Engine and frame (lower) M10 × 1.25 1 69 6.9 50
Engine bracket and frame M8 × 1.25 6 34 3.4 24
Engine and engine bracket (upper) M10 × 1.25 1 55 5.5 40
Lower engine guard M6 × 1.0 3 10 1.0 7.2
Left engine guard M8 × 1.25 2 23 2.3 17
Right engine guard M8 × 1.25 2 23 2.3 17
Regulator M6 × 1.0 2 7 0.7 5.1
Pivot shaft and nut M16 × 1.5 1 80 8.0 58
Relay arm and swingarm M14 × 1.5 1 70 7.0 50
Relay arm and connecting rod M14 × 1.5 1 80 8.0 58
Connecting rod and frame M14 × 1.5 1 80 8.0 58
Rear shock absorber and frame M10 × 1.25 1 56 5.6 40
Rear shock absorber and relay arm M10 × 1.25 1 53 5.3 38
Rear frame (upper) M8 × 1.25 1 32 3.2 23
Rear frame (lower) M8 × 1.25 2 29 2.9 21
Swingarm and brake hose holder M5 × 0.8 4 2 0.2 1.4
Swingarm and patch M4 × 0.7 4 2 0.2 1.4
Upper drive chain tensioner M8 × 1.25 1 19 1.9 13
Lower drive chain tensioner M8 × 1.25 1 20 2.0 14
Drive chain support M6 × 1.0 3 7 0.7 5.1
Seal guard and swingarm M5 × 0.8 4 6 0.6 4.3
Fuel tank M6 × 1.0 2 10 1.0 7.2
Fuel cock M6 × 1.0 2 6 0.6 4.3
Seat set bracket and fuel tank M6 × 1.0 1 7 0.7 5.1
Hooking screw (fitting band) and fuel tank M6 × 1.0 1 7 0.7 5.1
Fuel tank bracket and fuel tank M6 × 1.0 4 7 0.7 5.1
Air scoop and fuel tank M6 × 1.0 6 7 0.7 5.1
Air scoop and radiator guard (lower) M6 × 1.0 2 6 0.6 4.3
Front fender M6 × 1.0 4 7 0.7 5.1
Rear fender (front) M6 × 1.0 2 7 0.7 5.1
Rear fender (rear) M6 × 1.0 2 11 1.1 8.0
Side cover M6 × 1.0 2 7 0.7 5.1
Seat M8 × 1.25 2 23 2.3 17
Multi-function display bracket and upper
bracketM6 × 1.0 2 7 0.7 5.1
Multi-function display M5 × 0.8 2 4 0.4 2.9

3 - 3
INSP
ADJ
MAINTENANCE INTERVALS
*marked: For USAFRONT FORKS
Inspect and adjust
Replace oilSuspension oil “S1”
Replace oil seal
FRONT FORK OIL SEAL AND DUST SEAL
Clean and lubeLithium base grease
PROTECTOR GUIDE
Replace
REAR SHOCK ABSORBER
Inspect and adjust
Lube
(After
rain
ride)Molybdenum disulfide
grease
Retighten
DRIVE CHAIN GUIDE AND ROLLERS
Inspect
DRIVE CHAIN STOPPER
Inspect
SWINGARMMolybdenum disulfide
grease
Inspect, lube and retighten
RELAY ARM, CONNECTING ROD Molybdenum disulfide
grease
Inspect, lube and retighten
SIDESTAND
LubricateLithium base grease
STEERING HEAD
Inspect free play and retighten
Clean and lubeLithium base grease
Replace bearing
TIRE, WHEELS
Inspect air pressure, wheel run-out, tire
wear and spoke looseness
Retighten sprocket bolt
Inspect bearings
Replace bearings
LubricateLithium base grease
THROTTLE, CONTROL CABLE Yamaha cable lube or SAE
10W-30 motor oil
Inspect dirt and wear on the
throttle cable on the
carburetor side. Check routing and connection
Lubricate
Inspect and clean (throttle cable)
HOT STARTER, CLUTCH LEVER
Inspect free play
BATTERY
Check terminal for looseness and
corrosionItemAfter
break-inEvery
race
Every third
(or
500 km)Every fifth
(or
1,000 km)As
requiredRemarks

3 - 16
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.P.3-21 ~ 29
FuelCheck that a fresh gasoline is filled in the fuel tank. Check the
fuel line for leakage.P.1-49
Engine oilCheck that the oil level is correct. Check the crankcase and
frame oil line for leakage.P.3-39 ~ 47
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-29 ~ 31
Throttle grip/HousingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-31 ~ 33
Brakes Check the play of front brake and effect of front and rear brake. P.3-65 ~ 77
Drive chainCheck drive chain slack and alignment. Check that the drive
chain is lubricated properly.P.3-79 ~ 83
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-99 ~ 101
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-101 ~ 103
Front forks and rear shock
absorberCheck that they operate smoothly and there is no oil leakage. P.3-85 ~ 97
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or when
the front forks travel up and down.—
Exhaust pipeCheck that the exhaust pipe is tightly mounted and has no
cracks.P.4-7 ~ 11
Rear wheel sprocket Check that the rear wheel sprocket tightening bolt is not loose. P.3-77
Lubrication Check for smooth operation. Lubricate if necessary. P.3-105
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P.1-59
Lead connectorsCheck that the AC magneto, CDI unit, and ignition coil are
connected tightly.P.1-9
SettingsIs the machine set suitably for the condition of the racing course
and weather or by taking into account the results of test runs
before racing? Are inspection and maintenance completely
done?P.7-1 ~ 40

3 - 73
INSP
ADJ
4. Check:
Brake lever operation
A softy or spongy feeling
→
Bleed brake system.
Refer to “BRAKE SYSTEM
AIR BLEEDING” section.
REAR BRAKE PAD INSPECTION
AND REPLACEMENT
1. Inspect:
Brake pad thickness
a
Out of specification
→
Replace as a set.
Brake pad thickness:
6.4 mm (0.25 in)
:
1.0 mm (0.04 in)
2. Replace:
Brake pad
Brake pad replacement steps:
Remove the protector
1 and
pad pin plug
2.
Loosen the pad pin
3.
Remove the rear wheel
4 and
brake caliper
5.
Refer to “FRONT WHEEL AND
REAR WHEEL” section in the
CHAPTER 5.
Remove the pad pin
6 and
brake pads
7.
Connect the transparent hose
8 to the bleed screw
9 and
place the suitable container
under its end.
Loosen the bleed screw and
push the brake caliper piston in.
CAUTION:
Do not reuse the drained brake
fluid.
Tighten the bleed screw.
T R..
Bleed screw:
6 Nm
(0.6 m  kg, 4.3 ft  lb)
4. Contrôler:
Fonctionnement du levier de frein
Sensation de mollesse → Purger
le circuit de freinage.
Se reporter à la section “PURGE
D’AIR DU CIRCUIT DE FREI-
NAGE”.
CONTROLE ET REMPLACEMENT
DES PLAQUETTES DE FREIN
ARRIERE
1. Contrôler:
Epaisseur des plaquettes de freins
a
Hors spécifications → Remplacer
l’ensemble.
Epaisseur de la plaquette
de frein:
6,4 mm (0,25 in)
:
1,0 mm (0,04 in)
2. Remplacer:
Plaquette de frein
Etapes du remplacement des pla-
quettes de frein:
Déposer la protection 1 et le bou-
chon de goupille de plaquette 2.
Desserrer la goupille de plaquette
3.
Déposer la roue arrière 4 et
l’étrier de frein 5.
Se reporter à la section “ROUE
AVANT ET ROUE ARRIERE” au
CHAPITRE 5.
Déposer la goupille de plaquette 6
et les plaquettes de frein 7.
Raccorder le tuyau transparent 8 à
la vis de purge 9 et placer un réci-
pient adéquat sous son extrémité.
Desserrer la vis de purge et enfon-
cer le piston de l’étrier de frein.
ATTENTION:
Ne pas réutiliser le liquide de frein
purgé.
Resserrer la vis de purge.
T R..
Vis de purge:
6 Nm
(0,6 m  kg, 4,3 ft  lb)
CHASSIS
CHASSIS

3 - 75
INSP
ADJ
3. Inspect:
Brake fluid level
Refer to “BRAKE FLUID
LEVEL INSPECTION” section.
4. Check:
Brake pedal operation
A softy or spongy feeling
→
Bleed brake system.
Refer to “BRAKE SYSTEM
AIR BLEEDING” section. Install the brake pad
0 and pad
pin
A.
NOTE:Install the brake pads with their
projections
a into the brake
caliper recesses
b.
Temporarily tighten the pad pin
at this point.
Install the brake caliper
B and
rear wheel
C.
Refer to “FRONT WHEEL AND
REAR WHEEL” section in the
CHAPTER 5.
Tighten the pad pin
D.
T R..
Pad pin:
18 Nm
(1.8 m  kg, 13 ft  lb)
Install the pad pin plug
E and
protector
F.
T R..
Pad pin plug:
3 Nm
(0.3 m  kg, 2.2 ft  lb)
Bolt (protector):
7 Nm
(0.7 m  kg, 5.1 ft  lb)
EC36b000REAR BRAKE PAD INSULATOR
INSPECTION
1. Remove:
Brake pad
Refer to “REAR BRAKE PAD
INSPECTION AND RE-
PLACEMENT” section.
2. Inspect:
Rear brake pad insulator
1
Damage
→ Replace.
3. Contrôler:
Niveau du liquide de frein
Se reporter à la section “CON-
TROLE DU NIVEAU DU
LIQUIDE DE FREIN”.
4. Contrôler:
Fonctionnement de la pédale de
frein
Sensation de mollesse → Purger
le circuit de freinage.
Se reporter à la section “PURGE
D’AIR DU CIRCUIT DE FREI-
NAGE”. Monter les plaquettes de frein 0 et
la goupille de plaquette A.
N.B.:
Monter les plaquettes de frein en
insérant leurs ergots a dans les
gorges des étriers de freins b.
A ce stade, serrer provisoirement la
goupille de plaquette.
Monter l’étrier de frein B et la
roue arrière C.
Se reporter à la section “ROUE
AVANT ET ROUE ARRIERE” au
CHAPITRE 5.
Serrer la goupille de plaquette D.
T R..
Goupille de plaquette:
18 Nm
(1,8 m  kg, 13 ft  lb)
Monter le bouchon de plaquette de
frein E et la protection F.
T R..
Bouchon de goupille de
plaquette:
3 Nm
(0,3 m  kg, 2,2 ft  lb)
Boulon (protection):
7 Nm
(0,7 m  kg, 5,1 ft  lb)
CONTROLE DE L’ISOLANT DE
PLAQUETTE DE FREIN ARRIERE
1. Déposer:
Plaquette de frein
Se reporter à la section “CON-
TROLE ET REMPLACEMENT
DES PLAQUETTES DE FREIN
ARRIERE”.
2. Contrôler:
Isolation de plaquette de frein
arrière 1
Endommagement → Remplacer.
CHASSIS
CHASSIS

3 - 77
INSP
ADJ
BRAKE FLUID LEVEL
INSPECTION
1. Place the brake master cylinder
so that its top is in a horizontal
position.
2. Inspect:
Brake fluid level
Fluid at lower level
→ Fill up.
aLower level
ÈFront
ÉRear
WARNING
Use only designated quality
brake fluid to avoid poor brake
performance.
Refill with same type and brand
of brake fluid; mixing fluids
could result in poor brake per-
formance.
Be sure that water or other con-
taminants do not enter master
cylinder when refilling.
Clean up spilled fluid immedi-
ately to avoid erosion of painted
surfaces or plastic parts.
Recommended brake
fluid:
DOT #4
ÈÉ
SPROCKETS INSPECTION
1. Inspect:
Sprocket teeth
a
Excessive wear
→ Replace.
NOTE:Replace the drive sprocket, rear
wheel sprocket and drive chain as a
set.
CONTROLE DU NIVEAU DU
LIQUIDE DE FREIN
1. Placer le maître-cylindre de frein de
manière que son extrémité soit hori-
zontale.
2. Contrôler:
Niveau du liquide de frein
Niveau du liquide bas → Remet-
tre à niveau.
a
Niveau inférieur
È
Avant
É
Arrière
AVERTISSEMENT
N’utiliser que le liquide de frein
recommandé pour éviter une perte
d’efficacité du freinage.
Toujours utiliser la même marque
et le même type de liquide de frein;
le mélange de liquides de frein diffé-
rents peut provoquer une perte
d’efficacité du freinage.
Veiller à ne pas laisser d’eau ou
d’autres impuretés pénétrer dans le
maître-cylindre lors du remplissage.
Essuyer immédiatement tout liquide
renversé pour éviter d’endommager
les surfaces peintes ou les pièces en
plastique.
Liquide de frein
recommandé:
DOT n°4
CONTROLE DES PIGNONS
1. Contrôler:
Dents de pignon
a
Usure excessive → Remplacer.
N.B.:
Remplacer ensemble le pignon d’entraî-
nement, la couronne arrière et la chaîne
de transmission.
CHASSIS
CHASSIS