2007 YAMAHA WR 250F Shock

4 - 40
TUNSETTING
Rear shock absorber
NOTE:If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to
the adjustment procedure given in the same chart.
Adjust the rebound damping in 2-click increments or decrements.
Adjust the low compression damping in 1-click increments or decrements.
Adjust the high compression damping in 1/6 turn increments or decrements.
SymptomSection
Check Adjust
JumpLarge
gapMedium
gapSmall
gap
Stiff, tending to sinkRebound damping
Spring set lengthTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in)
when one passenger is astride seat.
Spongy and unstableRebound damping
Low compression
damping
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster clockwise (about 1 click) to increase
damping.
Replace with stiff spring.
Heavy and draggingRebound damping
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Replace with soft spring.
Poor road grippingRebound damping
Low compression
damping
High compression
damping
Spring set length
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Turn adjuster clockwise (about 1 clicks) to increase
damping.
Turn adjuster clockwise (about 1/6 clicks) to
increase damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in)
when one passenger is astride seat.
Replace with soft spring.
Bottoming outHigh compression
damping
Spring set length
SpringTurn adjuster clockwise (about 1/6 turn) to increase
damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in)
when one passenger in astride seat.
Replace with stiff spring.
BouncingRebound damping
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Replace with soft spring.
Stiff travelHigh compression
damping
Spring set length
SpringTurn adjuster counterclockwise (about 1/6 turn) to
decrease damping.
Set sunken length for 90 ~ 100 mm (3.5 ~ 3.9 in)
when one passenger is astride seat.
Replace with soft spring.

5 - 9
ENGCARBURETOR
CARBURETOR
Extent of removal:
1 Carburetor removal
Extent of removal Order Part name Q’ty Remarks
CARBURETOR REMOVAL
Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE COVERS”
section in the CHAPTER 3.
Rear shock absorber Refer to “REAR SHOCK ABSORBER” section in the
CHAPTER 6.
1 Clamp 2
2 Throttle position sensor lead coupler 1
3 Throttle cable cover 1
4 Throttle cable 2
5 Clamp (air filter joint) 1 Loosen the screw (air filter joint).
6 Clamp (carburetor joint) 1 Loosen the screws (carburetor joint).
7 Hot starter plunger 1
8 Carburetor assembly 1
9 Carburetor joint 1
1

6 - 57
CHASFRONT BRAKE AND REAR BRAKE
2. Install:
Brake hose holder
1
Screw (brake hose holder)
2
CAUTION:
After installing the brake hose
holders, make sure the brake hose
does not contact the spring (rear
shock absorber). If it does, correct
its twist.
T R..2 Nm (0.2 m · kg, 1.4 ft · lb)
Brake fluid
1. Fill:
Brake fluid
Until the fluid level reaches
“LOWER” level line
a.
WARNING
Use only the designated quality
brake fluid:
otherwise, the rubber seals may
deteriorate, causing leakage and
poor brake performance.
Refill with the same type of
brake fluid;
mixing fluids may result in a
harmful chemical reaction and
lead to poor performance.
Be careful that water does not
enter the master cylinder when
refilling. Water will significantly
lower the boiling point of the
fluid and may result in vapor
lock.
CAUTION:
Brake fluid may erode painted sur-
faces or plastic parts. Always
clean up spilled fluid immediately.
È
Front
É
Rear
Recommended brake
fluid:
DOT #4
È
É
2. Monter:
Support de durit de frein 1
Vis (support de durit de frein) 2
ATTENTION:
Après avoir monté les supports de
durits de frein, vérifier que la durit de
frein ne soit pas en contact avec le res-
sort (amortisseur arrière). Si c’est le
cas, en corriger la torsion.
T R..2 Nm (0,2 m · kg, 1,4 ft · lb)
Liquide de frein
1. Remplir:
Liquide de frein
Jusqu’à ce que le liquide atteigne
le repère de niveau “LOWER”
a.
AVERTISSEMENT
Utiliser exclusivement le type de
liquide de frein recommandé:
sinon les joints en caoutchouc ris-
quent de se détériorer, entraînant
des fuites et un mauvais fonctionne-
ment du frein.
Toujours utiliser la même marque
de liquide de frein;
le mélange de liquides de marques
différentes risque de provoquer une
réaction chimique nuisible au fonc-
tionnement du frein.
Veiller à ce que, lors du remplis-
sage, de l’eau ne pénètre pas dans le
maître-cylindre. En effet, l’eau
abaissera nettement le point d’ébul-
lition du liquide, ce qui risque de
provoquer un bouchon de vapeur.
ATTENTION:
Le liquide de frein peut attaquer les
surfaces peintes et les pièces en plasti-
que. Toujours essuyer immédiatement
toute trace de liquide renversé.
È
Avant
É
Arrière
Liquide de frein
recommandé:
DOT n°4
FREIN AVANT ET FREIN ARRIERE

6 - 121
CHASSWINGARM
EC570000
SWINGARM
Extent of removal:
1 Swingarm removal
Extent of removal Order Part name Q’ty Remarks
SWINGARM REMOVAL
WARNING
Support the machine securely so there is nodanger of it falling over. Preparation for removal Hold the machine by placing the suitable
stand under the engine.
Brake hose holder
Refer to “FRONT BRAKE AND REAR BRAKE”
section.
Rear brake caliper
Bolt (brake pedal) Shift the brake pedal backward.
Drive chain
1 Drive chain support 1
2 Lower chain tensioner 1
3 Bolt (rear shock absorber-relay arm) 1 Hold the swingarm.
4 Bolt (connecting rod) 1
5 Pivot shaft 1
6 Swingarm 1
1

6 - 137
CHASSWINGARM
7. Check:
•Swingarm side play
a
Free play exists
→ Replace
thrust bearing.
•Swingarm up and down move-
ment
b
Unsmooth movement/binding/
rough spots
→ Grease or
replace bearings, bushings
and collars.
8. Install:
•Bolt (connecting rod)
1
•Washer
2
•Nut (connecting rod)
3
NOTE:•Apply the molybdenum disulfide
grease on the bolt.
•Do not tighten the nut yet.
9. Install:
•Bolt (rear shock absorber-
relay arm)
1
•Nut (rear shock absorber-relay
arm)
2
NOTE:Apply the molybdenum disulfide
grease on the bolt.
T R..53 Nm (5.3 m · kg, 38 ft · lb)
10. Tighten:
•Nut (connecting rod)
1
T R..80 Nm (8.0 m · kg, 58 ft · lb)
11. Tighten:
•Nut (relay arm)
1
T R..70 Nm (7.0 m · kg, 50 ft · lb)
7. Contrôler:
Jeu latéral du bras oscillant a
Jeu → Remplacer le roulement de
butée.
Mouvement de bas en haut du
bras oscillant b
Mouvement irrégulier/coince-
ment/rugosités → Graisser ou
remplacer les roulements, les
bagues et les entretoises épaulées.
8. Monter:
Boulon (bielle) 1
Rondelle 2
Ecrou (bielle) 3
N.B.:
Appliquer de la graisse au bisulfure de
molybdène sur le boulon.
Ne pas encore serrer l’écrou.
9. Monter:
Boulon (amortisseur arrière –
bras relais) 1
Ecrou (amortisseur arrière – bras
relais) 2
N.B.:
Appliquer de la graisse au bisulfure de
molybdène sur le boulon.
T R..53 Nm (5,3 m · kg, 38 ft · lb)
10. Serrer:
Ecrou (bielle) 1
T R..80 Nm (8,0 m · kg, 58 ft · lb)
11. Serrer:
Ecrou (bras relais) 1
T R..70 Nm (7,0 m · kg, 50 ft · lb)
BRAS OSCILLANT

6 - 141
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
Extent of removal:
1 Rear shock absorber removal
2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
REAR SHOCK ABSORBER REMOVAL
WARNING
Support the machine securely so there is nodanger of it falling over. Preparation for removal Hold the machine by placing the suitable
stand under the engine.
Seat and side covers Refer to “SEAT, FUEL TANK AND SIDE COVERS”
section in the CHAPTER 3.
Silencer Refer to “EXHAUST PIPE AND SILENCER” section
in the CHAPTER 3.
Drain the coolant. Refer to “COOLANT REPLACEMENT” section in the
CHAPTER 3.
Catch tank breather hose Disconnect at the catch tank side.
Catch tank hose Disconnect at the catch tank side.
Air induction hose (air cut-off valve-air filter
case)Disconnect at the air filter case side.
Cylinder head breather hose Disconnect at the air filter case side.
Battery Refer to “BATTERY INSPECTION AND
CHARGING” section in the CHAPTER 3.
Disconnect the starter relay coupler.
Starter motor lead Disconnect at the starter relay side.

6 - 145
CHASREAR SHOCK ABSORBER
Extent of removal Order Part name Q’ty Remarks
1 Locking tie 4
2 Taillight coupler 1
3 CDI unit coupler 3
4 Plastic band 1
5 Clamp (air filter joint) 1 Only loosening.
6 Rear frame 1
7 Bolt (rear shock absorber-relay arm) 1 Hold the swingarm.
8 Bolt (rear shock absorber-frame) 1
9 Rear shock absorber 1
10 Locknut 1
Only loosening.
11 Adjuster 1
12 Lower spring guide 1
13 Upper spring guide 1
14 Spring (rear shock absorber) 1
15 Bearing 2 Refer to “REMOVAL POINTS”.
1
2

6 - 149
CHASREAR SHOCK ABSORBER
HANDLING NOTE
WARNING
This rear shock absorber is pro-
vided with a separate type tank
filled with high-pressure nitrogen
gas. To prevent the danger of
explosion, read and understand
the following information before
handling the shock absorber.
The manufacturer can not be held
responsible for property damage
or personal injury that may result
from improper handling.
1. Never tamper or attempt to
disassemble the cylinder or
the tank.
2. Never throw the rear shock
absorber into an open flame
or other high heat. The rear
shock absorber may explode
as a result of nitrogen gas
expansion and/or damage to
the hose.
3. Be careful not to damage any
part of the gas tank. A dam-
aged gas tank will impair the
damping performance or
cause a malfunction.
4. Take care not to scratch the
contact surface of the piston
rod with the cylinder; or oil
could leak out.
5. Never attempt to remove the
plug at the bottom of the nitro-
gen gas tank. It is very danger-
ous to remove the plug.
6. When scrapping the rear
shock absorber, follow the
instructions on disposal.
NOTES ON DISPOSAL
(YAMAHA DEALERS ONLY)
Before disposing the rear shock
absorber, be sure to extract the nitro-
gen gas from valve
1. Wear eye
protection to prevent eye damage
from escaping gas and/or metal
chips.
WARNING
To dispose of a damaged or worn-
out rear shock absorber, take the
unit to your Yamaha dealer for this
disposal procedure.
REMARQUES CONCERNANT LA
MANIPULATION
AVERTISSEMENT
Cet amortisseur arrière est équipé
d’un réservoir indépendant contenant
de l’azote sous haute pression. Afin
d’éviter tout danger d’explosion, lire
attentivement les informations ci-des-
sous avant de manipuler l’amortisseur
arrière.
Le fabricant décline toute responsabi-
lité pour les dommages matériels ou
corporels résultant d’une mauvaise
manipulation.
1. Ne jamais essayer de démonter le
cylindre ou le réservoir.
2. Ne jamais jeter un amortisseur
usagé au feu ou l’exposer à une
chaleur intense. L’amortisseur
arrière risque d’exploser en rai-
son de la dilatation de l’azote et/
ou de l’endommagement de la
durit.
3. Veiller à n’endommager aucune
partie du réservoir de gaz. Un
réservoir endommagé affectera la
capacité d’amortissement ou
entraînera un mauvais fonction-
nement.
4. Veiller à ne pas rayer la surface
de contact de la tige de piston
avec le cylindre afin d’éviter tout
risque de fuite d’huile.
5. Ne jamais essayer d’enlever le
bouchon du fond du réservoir
d’azote. Il est très dangereux
d’enlever ce bouchon.
6. Pour la mise au rebut de l’amor-
tisseur, suivre les instructions spé-
cifiques.
REMARQUES CONCERNANT LA
MISE AU REBUT
(CONCESSIONNAIRES YAMAHA
UNIQUEMENT)
Avant de mettre l’amortisseur arrière au
rebut, ne pas oublier d’évacuer l’azote
par la soupape 1. Mettre des lunettes
pour se protéger du gaz et/ou des parti-
cules de métal susceptibles de s’échap-
per.
AVERTISSEMENT
Confier la mise au rebut d’un amortis-
seur endommagé ou usé à un conces-
sionnaire Yamaha.
AMORTISSEUR ARRIERE