2003 YAMAHA WR 250F length

6 - 41
–+ELECELECTRIC STARTING SYSTEM
5. Measure:
Brush length
a
Out of specification
→
Replace the brushes as a set.
Min. brush length:
3.5 mm (0.14 in)
6. Measure:
Brush spring force
Out of specification
→
Replace the brush springs as
a set.
Brush spring force:
3.92 ~ 5.88 N
(400 ~ 600 gf,
14.1 ~ 21.2 oz)
ASSEMBLY
1. Install:
Brush spring
1
Brush
2
2. Install:
Armature assembly
1
Install while holding down the
brush using a thin screw
driver.
CAUTION:
Be careful not to damage the
brush during installation.
3. Install:
Gasket
1
Starter motor yoke
2
NOTE:Install the starter motor yoke with
its groove
a facing front cover.
Align the match mark
b on the
starter motor yoke with the match
mark
c on the starter motor rear
cover.
New
5. Mesurer:
Longueur des balais a
Hors spécification → Remplacer
les deux balais.
Longueur minimale des
balais:
3,5 mm (0,14 in)
6. Mesurer:
Force des ressorts des balais
Hors spécification → Remplacer
les deux ressorts de balais.
Force des ressorts des
balais:
3,92 à 5,88 N
(400 à 600 g,
14,1 à 21,2 oz)
ASSEMBLAGE
1. Monter:
Ressort de balais 1
Balais 2
2. Monter:
Ensemble de l’armature 1
Installer tout tenant le balais
enfoncé avec un tournevis fin.
ATTENTION:
Ne pas endommager le balais pendant
l’installation.
3. Monter:
Joint 1
Stator de démarreur 2
N.B.:
Installer le stator du moteur de démar-
reur dans sa rainure a face au couver-
cle avant.
Faire coïncider le repère b sur le sta-
tor de moteur et le repère c sur le
couvercle arrière du démarreur.
New
SYSTEM DE DEMARRAGE ELECTRIQUE

7 - 35
TUNSETTING
EC72B000Rear suspension setting
The rear suspension setting should
be made depending on the rider’s
feeling of an actual run and the cir-
cuit conditions.
The rear suspension setting includes
the following two factors:
1. Setting of spring preload
Change the set length of the
spring.
Change the spring.
2. Setting of damping force
Change the rebound damping.
Change the compression
damping.
EC72C001Choosing set length
1. Place a stand or block under the
engine to put the rear wheel
above the floor, and measure
the length
a between the rear
wheel axle center and the rear
fender holding bolt.
2. Remove the stand or block from
the engine and with a rider
astride the seat, measure the
sunken length
b between the
rear wheel axle center and the
rear fender holding bolt.
3. Loosen the locknut
1 and make
adjustment by turning the spring
adjuster
2 to achieve the stan-
dard figure from the subtraction
of the length
b from the length
a.
NOTE:If the machine is new and after it is
broken in, the same set length of
the spring may change because of
the initial fatigue, etc. of the spring.
Therefore, be sure to make re-
evaluation.
If the standard figure cannot be
achieved by adjusting the spring
adjuster and changing the spring
set length, replace the spring with
an optional one and make re-
adjustment.
Standard figure:
90 ~ 100 mm
(3.5 ~ 3.9 in)
Réglage de la suspension arrière
Effectuer le réglage de la suspension
arrière en fonction de la sensation lors de
la conduite ainsi que des conditions de
route.
Les deux réglages de la suspension
arrière sont les suivants:
1. Réglage de la précharge du ressort
Régler la longueur du ressort.
Changer de type de ressort.
2. Réglage de la force d’amortisse-
ment
Régler la force de rebond.
Régler la force de compression.
Choix de la longueur de ressort
1. Placer un support ou un bloc sous le
moteur pour surélever la roue
arrière et mesurer la longueur a
entre le centre de l’axe de roue
arrière et le boulon de fixation du
garde-boue arrière.
2. Retirer le support ou le bloc et
mesurer, avec une personne assise
correctement sur la selle, la lon-
gueur b entre le centre de l’axe de
roue arrière et le boulon de fixation
du garde-boue arrière.
3. Desserrer le contre-écrou 1 et
effectuer le réglage en tournant le
dispositif de réglage 2 de sorte à
régler à la valeur standard, obtenue
en soustrayant la longueur b de la
longueur a.
N.B.:
Le ressort peut s’allonger au fur et à
mesure de la période de rodage. Il est
donc important de corriger les régla-
ges régulièrement.
Si la valeur standard ne peut être obte-
nue à l’aide du dispositif de réglage et
en ajustant la longueur du ressort,
remplacer le ressort avec un ressort en
option et effectuer un nouveau
réglage.
Valeur standard:
90 à 100 mm (3,5 à 3,9 in)
REGLAG

7 - 37
TUNSETTING
Setting of spring after
replacement
After replacement, be sure to adjust
the spring to the set length [sunken
length 90 ~ 100 mm (3.5 ~ 3.9 in)]
and set it.
1. Use of soft spring
Set the soft spring for less
rebound damping to compen-
sate for its less spring load.
Run with the rebound damping
adjuster one or two clicks on
the softer side and readjust it
to suit your preference.
2. Use of stiff spring
Set the soft spring for more
rebound damping to compen-
sate for its greater spring load.
Run with the rebound damping
adjuster one or two clicks on
the stiffer side and readjust it
to suit your preference.
*Adjusting the rebound damp-
ing will be followed more or
less by a change in the com-
pression damping. For correc-
tion, turn the low compression
damping adjuster on the softer
side.
CAUTION:
When using a rear shock absorber
other than currently installed, use
the one whose overall length a
does not exceed the standard as it
may result in faulty performance.
Never use one whose overall
length is greater than standard.
È
Coverage of spring by weight
É
Rider weight
1Soft
2Standard
3Stiff
Length a
of standard
shock:
490.5 mm (19.31 in)
Réglage du ressort après
remplacement
Après avoir remplacé le ressort, veiller à
ajuster celui-ci à la longueur recomman-
dée [profondeur 90 à 100 mm (3,5 à
3,9 in)] et à le régler.
1. Ressort mou
Régler le ressort doux de sorte à
ce que la force de rebond soit
moindre puisque la charge du res-
sort sera moindre. Rouler après
avoir dévissé le dispositif de
réglage de la force de rebond
d’un ou deux déclics et ajuster
ensuite selon ses préférences.
2. Ressort dur
Régler le ressort dur de sorte à ce
que la force de rebond soit plus
élevée afin de compenser la
charge du ressort plus grande.
Rouler après avoir vissé le dispo-
sitif de réglage de la force de
rebond d’un ou deux déclics et
ajuster ensuite selon ses préféren-
ces.
*Un réglage de la force de rebond
entraîne un changement de la
force de compression. Pour com-
penser, dévisser le dispositif de
réglage de la force de compres-
sion.
ATTENTION:
Lors du remplacement de l’amortis-
seur arrière, veiller à monter un
amortisseur dont la longueur totale a
n’excède pas la longueur standard
sinon, il y a risque de mauvaises per-
formances. Ne jamais monter un
amortisseur dont la longueur totale est
supérieure à la longueur standard.
È
Ressort recommandé en fonction du
poids
É
Poids du motocycliste
1
Mou
2
Standard
3
Dur
Longueur standard a
d’amatisseur arrière:
490,5 mm (19,31 in)
REGLAG

7 - 39
TUNSETTING
EC72Q000Rear shock absorber setting parts
Rear shock spring
1
[Equal pitch spring]
* For EUROPE
** For AUS, NZ and ZA
[Unequal pitch spring]
NOTE:The unequal pitch spring is softer
in initial characteristic than the
equal pitch spring and is difficult to
bottom out under full compression.
The I.D. color
a is marked at the
end of the spring.
Extent of adjustment
(spring length)
TYPESPRING
RATESPRING
PART
NUMBERI.D.
COLOR/
POINTSPRING
FREE
LENGTH
SOFT4.3
4.55UN-22212-00
5UN-22212-10Brown/1
Green/1260
260
* STD 4.7 5UN-22212-20 Red/1 260
4.9 5UN-22212-30 Black/1 260
STD 5.0 5UN-22212-80 Orange/1 260
** STD 5.1 5UN-22212-40 Blue/1 260
STIFF5.3
5.5
5.75UN-22212-50
5UN-22212-60
5UN-22212-70Yellow/1
Pink/1
White/1260
260
260
TYPE
SPRING
RATE
(approx.)SPRING
PART
NUMBERI.D.
COLOR/
POINTSPRING
FREE
LENGTH
SOFT
STIFF4.5
4.7
4.9
5.1
5.3
5.5
5.75UN-22212-A0
5UN-22212-B0
5UN-22212-C0
5UN-22212-D0
5UN-22212-E0
5UN-22212-F0
5UN-22212-G0
Green/2
Red/2
Black/2
Blue/2
Yellow/2
Pink/2
White/2275
275
275
275
275
275
275
SPRING FREE
LENGTHEXTENT OF
ADJUSTMENT
b

260 mm
(10.24 in)
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)
275 mm
(10.83 in)255.5 ~ 273.5 mm
(10.06 ~ 10.77 in)
Pièces de réglage de l’amortisseur
arrière
Ressort d’amortisseur arrière 1
[Ressort à pas égal]
* EUROPE
** AUS, NZ et ZA
[Ressort à pas inégal]
N.B.:
Le ressort à pas inégal est plus souple
suivant les caractéristiques initiales
que le ressort à pas égal et atteind dif-
ficilement son niveau le plus bas sous
une compression totable.
Le repère de couleur a est indiquée à
l’extrémité du ressort.
Longueur de réglage
(longueur de ressort)
TypeConstante
du ressortNuméro de pièce
de ressortRepere de
couleur/
pointLongueur
de ressort
MOU4,3
4,55UN-22212-00
5UN-22212-10Brun/1
Vert/1260
260
* STD 4,7 5UN-22212-20 Rouge/1 260
4,9 5UN-22212-30 Noir/1 260
STD 5,0 5UN-22212-80 Orange/1 260
** STD5,1 5UN-22212-40 Bleu/1 260
DUR5,3
5,5
5,75UN-22212-50
5UN-22212-60
5UN-22212-70Jaune/1
Rose/1
Blanc/1260
260
260
Type
Constante
du ressort
(approx.)Numéro de pièce
de ressortRepere de
couleur/
pointLongueur
de ressort
MOU
DUR4,5
4,7
4,9
5,1
5,3
5,5
5,75UN-22212-A0
5UN-22212-B0
5UN-22212-C0
5UN-22212-D0
5UN-22212-E0
5UN-22212-F0
5UN-22212-G0Vert/2
Rouge/2
Noir/2
Bleu/2
Jaune/2
Rose/2
Blanc/2275
275
275
275
275
275
275
LONGUEUR DE
RESSORT
LIBRELONGUEUR DE
REGLAGE b
260 mm (10,24 in)240,5 à 258,5 mm
(9,47 à 10,18 in)
275 mm (10,83 in)255,5 à 273,5 mm
(10,06 à 10,77 in)
REGLAG

7 - 41
TUNSETTING
EC72H002Suspension setting
Front fork
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.
Before any change, set the rear shock absorber sunken length to the standard figure 90 ~ 100 mm (3.5 ~ 3.9 in).
SymptomSection
Check Adjust
JumpLarge
gapMedium
gapSmall
gap
Stiff over entire rangeCompression damping
Oil level (oil amount)
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with soft spring.
Unsmooth movement
over entire rangeOuter tube
Inner tube
Under bracket tightening
torqueCheck for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Retighten to specified torque.
Poor initial
movementRebound damping
Oil sealTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Apply grease in oil seal wall.
Soft over entire
range, bottoming outCompression damping
Oil level (oil amount)
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Increase oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with stiff spring.
Stiff toward stroke
endOil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke
end, bottoming outOil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial movement Compression dampingTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low front, tending to
lower front postureCompression damping
Rebound damping
Balance with rear end
Oil level (oil amount)Turn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in)
when one passenger is astride seat (lower rear
posture).
Increase oil level by about 5 mm (0.2 in).
“Obtrusive” front,
tending to upper front
postureCompression damping
Balance with rear end
Spring
Oil lever (oil amount)Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 90 ~ 95 mm (3.5 ~ 3.7 in)
when one passenger is astride seat (upper rear
posture).
Replace with soft spring.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).

7 - 42
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.