2006 YAMAHA WR 250F oil

5 - 151
CHASREAR SHOCK ABSORBER
EC583000REMOVAL POINTSEC583320Bearing
1. Remove:
•Stopper ring
(upper bearing)
1
NOTE:Press in the bearing while pressing
its outer race and remove the stop-
per ring.
2. Remove:
•Upper bearing
1
NOTE:Remove the bearing by pressing its
outer race.
3. Remove:
•Lower bearing
1
NOTE:Remove the bearing by pressing its
outer race.
EC584000INSPECTION
Rear shock absorber
1. Inspect:
•Damper rod
1
Bends/damage
→ Replace
rear shock absorber assem-
bly.
•Shock absorber
2
Oil leaks
→ Replace rear
shock absorber assembly.
Gas leaks
→ Replace rear
shock absorber assembly.
•Spring
3
Damage
→ Replace spring.
Fatigue
→ Replace spring.
Move spring up and down.
•Spring guide
4
Wear/damage
→ Replace
spring guide.
•Bearing
5
Free play exists/unsmooth
revolution/rust
→ Replace.
POINTS DE DEPOSE
Roulement
1. Déposer:
Bague d’arrêt
(roulement supérieur) 1
N.B.:
Appuyer sur le roulement tout en pous-
sant sur sa cage externe et déposer la
bague d’arrêt.
2. Déposer:
Roulement supérieur 1
N.B.:
Déposer le roulement en appuyant sur sa
cage externe.
3. Déposer:
Roulement inférieur 1
N.B.:
Déposer le roulement en appuyant sur sa
cage externe.
CONTROLE
Amortisseur arrière
1. Contrôler:
Tige d’amortissement 1
Déformation/endommagement →
Remplacer l’amortisseur arrière
complet.
Amortisseur 2
Fuite d’huile → Remplacer
l’amortisseur arrière complet.
Fuite de gaz → Remplacer
l’amortisseur arrière complet.
Ressort 3
Endommagement → Remplacer
le ressort.
Fatigue → Remplacer le ressort.
Déplacer le ressort de haut en bas.
Guide de ressort 4
Usure/endommagement → Rem-
placer le guide de ressort.
Roulement 5
Jeu/mouvement irrégulier/rouille
→ Remplacer.
AMORTISSEUR ARRIERE

6 - 1
–+ELECELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000ELECTRICAL COMPONENTS
1Headlight
2Multi-function display
3Engine stop switch
4Clutch switch
5Diode
6Starter relay diode
7Throttle position sensor
8Starter relay
9Fuse
0Starting circuit cut-off relay
ATaillightBNeutral switch
CStarter motor
DAC magneto
ERectifier/regulator
FIgnition coil
GSpark plug
HStart switch
IMain switch
JCDI unit
KSpeed sensor
LBatteryCOLOR CODE
B ...................... Black
Br ..................... Brown
Ch .................... Chocolate
Dg .................... Dark green
Gy .................... Gray
L ...................... Blue
O...................... Orange
R ...................... Red
Sb .................... Sky blue
W ..................... WhiteY ...................... Yellow
B/L ................... Black/Blue
B/W .................. Black/White
L/B ................... Blue/Black
L/R ................... Blue/Red
L/Y ................... Blue/Yellow
L/W .................. Blue/White
R/B................... Red/Black
R/W.................. Red/White
EC612000WIRING DIAGRAM
1 234
56
789
0A
B C
D EFGH
I
J
K
L
B/L
W
W
R
BR/BBr
R
BR/BBr
R
Y
Y
L/R/BBB
SbL/W
L/YBBB
WY
RY
R
LY
B
YLB/L
B
B
ON
OFF
10A
BB
OFF
START
R-BrL/W
B
BrL/W
BrL/W
L/B
-Y
Y
B
LY
B
L/WSb
B/WBBB
W/R/W
R/
BGyBrL/W
ON
STOP
O
LSbB/L
W RBrB/W
L
/
BGyWR
/B
B O
L/YSbL/R
R W
Y W
Y W
Y
L B
B
B
RRR/B
B Br B
B B B B
L/W
R
R
R R B
R
BrBr
L/W L/
W
Br B
L/B
L/B
L/R

Br
R/B
L/B L
/W
B/W
WW
/RW
RO
L
Y
ELO
B
L
Y
B/LSb
SbB/W
B
B
L/R L/Y L/Y
B
SbSb
B
Gy
D
E
CI
6
H4 5
B3J
K
2FG
7
8L9
1A
W
B
R/W
Ch
Dg
Y
B BrRW
WRB/W
SIGNAL
+
Backup
SLCT1
SLCT2
RST
GND
BrR/WB
B
R/WBr
WRB/W
R B
W
ChDgYB
B/WWRB/WWR
0
R
W
W W
B/L
Y B
RB
B
L
L
SbBB/LYO
L

6 - 3
–+ELECMAP-CONTROLLED CDI UNIT
MAP-CONTROLLED CDI UNIT
A map-controlled, CDI ignition system is used in the WR250F.
The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining the optimum ignition
timing through the entire operating range. In this way, quick throttle response can be achieved according to various riding
conditions.






Function of Component






Principal of 3-Dimensional Control
Conventionally, ignition timing was controlled only by
engine revolutions (2-dimensional control).
However, ignition timing needs advancement also by
engine load. Thus, accurate ignition timing can be deter-
mined by adding throttle opening to determine ignition
timing (3-dimensional control).
3-D Image Map of Ignition Timing
(different from actual characteristics)
Component Function
Throttle position sensor Detects throttle valve opening and inputs it into the computer in the CDI unit as a
throttle opening signal.
Pickup coil Detects signal rotor revolutions and inputs them into the computer in the CDI unit as
engine revolution signals.
CDI unit The signals of the throttle position sensor and pickup coil sensor are analyzed by
the computer in the CDI unit, which then adjusts ignition timing for the operation
requirements.
Throttle position sensorCDI unitIgnition coil
Pickup coilAC magneto rotor
Ignition timing
Th
rot
t
le
o
peni
ngRev
ol
ut
ion
s

6 - 8
–+ELECIGNITION SYSTEM
EC620000
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure
and for checking the spark plug which will not spark.
*1 marked: Refer to “FUSE INSPECTION” section in the CHAPTER 3.
*2 marked: Refer to “BATTERY INSPECTION AND CHARGING” section in the CHAPTER 3.
*3 marked: Only when the ignition checker is used.
NOTE:•Remove the following parts before inspection.
1) Seat
2) Fuel tank
•Use the following special tools in this inspection.
*1 Check fuse.Replace fuse and check
wire harness.
*2 Check battery. Recharge or replace.
Spark gap test*3 Clean or replace spark
plug.
Check entire ignition system for
connection.
(couplers, leads and ignition coil)Repair or replace.
Check engine stop switch. Replace.
Check main switch.Replace.
Check ignition coil. Primary coil Replace.
Secondary coil Replace.
Check AC magneto. Pickup coil Replace.
Check neutral switch. Repair or replace.
Replace CDI unit.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
Pocket tester:
YU-3112-C/
90890-03112
No good
OK
No good
OK
Spark
No spark
No good
OK
No good
OK
No good
OK
No good
OKNo good
No good
OK
No good
OK

6 - 13
–+ELECIGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the ignition coil from
spark plug.
2. Remove the ignition coil cap.
3. Connect the dynamic spark
tester
1 (ignition checker
2) as
shown.
•Ignition coil
3
•Spark plug
4
ÈFor USA and CDN
ÉExcept for USA and CDN
4. Kick the kickstarter crank.
5. Check the ignition spark gap.
6. Start engine, and increase spark
gap until misfire occurs. (for USA
and CDN only)
Minimum spark gap:
6.0 mm (0.24 in)
È
É
COUPLERS, LEADS AND
IGNITION COIL CONNECTION
INSPECTION
1. Check:
•Couplers and leads connec-
tion
Rust/dust/looseness/short-cir-
cuit
→ Repair or replace.
•Ignition coil and spark plug as
they are fitted
Push in the ignition coil until it
closely contacts the spark plug
hole in the cylinder head
cover.
ENGINE STOP SWITCH
INSPECTION
1. Inspect:
•Engine stop switch conduct
No continuity while being pushed
→
Replace.
Continuity while being freed
→
Replace.Tester (+) lead →
Black lead 1

Tester (–) lead →
Black lead 2

B
1
B
2
Tester
selector
position
PUSH IN
Ω
×
1
FREE
TEST DE LA LONGUEUR
D’ETINCELLE
1. Déconnecter la bobine d’allumage
de la bougie.
2. Déposer le capuchon de la bobine
d’allumage.
3. Connecter le testeur dynamique
d’étincelle 1 (contrôleur d’allu-
mage 2) comme indiqué.
Bobine d’allumage 3
Bougie 4
È
USA et CDN
É
Sauf USA et CDN
4. Actionner le kick.
5. Contrôler la longueur d’étincelle
d’allumage.
6. Démarrer le moteur et augmenter la
longueur d’étincelle jusqu’à ce
qu’un raté se produise. (uniquement
USA et CDN)
Longueur d’étincelle
minimum:
6,0 mm (0,24 in)
CONTROLE DES CONNEXIONS
DES FICHES RAPIDES, DES FILS
ET DE LA BOBINE D’ALLUMAGE
1. Vérifier:
Connexion des coupleurs et des
fils
Rouille/poussière/jeu/court-cir-
cuit → Réparer ou remplacer.
Bobine d’allumage et bougie en
place
Appuyer sur la bobine d’allu-
mage jusqu’à ce qu’elle soit en
contact étroit avec le trou de bou-
gie du couvre-culasse.
CONTROLE DU COUPE-CIRCUIT
DU MOTEUR
1. Contrôler:
Continuité du coupe-circuit du
moteur
Pas de continuité lorsque enfoncé →
Remplacer.
Continuité lorsque relâché → Rempla-
cer.Fil (+) du multimètre → fil noir 1
Fil (–) du multimètre → fil noir 2
B
1 B
2 Position du
sélecteur du
multimètre
ENFONCE
Ω × 1
RELACHE
SYSTEME D’ALLUMAGE

6 - 17
–+ELECIGNITION SYSTEM
EC626002IGNITION COIL INSPECTION
1. Remove the ignition coil cap.
2. Inspect:
•Primary coil resistance
Out of specification
→
Replace.
Tester (+) lead →
Orange lead 1

Tester (–) lead →
Black lead 2

Primary coil
resistanceTester
selector
position
0.08 ~ 0.10 Ω

at 20 °C (68 °F)Ω
×
1
3. Inspect:
•Secondary coil resistance
Out of specification
→
Replace.
Tester (+) lead →
Orange lead 1

Tester (–) lead →

Spark plug terminal 2
Secondary
coil resistanceTester
selector
position
4.6 ~ 6.8 kΩ
at
20 °C (68 °F)kΩ
×
1
4. Inspect:
•Sealed portion of ignition coil
a
•Spark plug terminal pin
b
•Threaded portion of spark plug
c
Wear
→ Replace.
CONTROLE DE LA BOBINE
D’ALLUMAGE
1. Déposer le capuchon de la bobine
d’allumage.
2. Contrôler:
Résistance de l’enroulement pri-
maire
Hors spécifications → Rempla-
cer.
Fil (+) du multimètre →
fil orange 1
Fil (–) du multimètre → fil noir 2
Résistance de
l’enroulement
primairePosition du
sélecteur du
multimètre
0,08 à 0,10 Ω à
20 °C (68 °F)Ω × 1
3. Contrôler:
Résistance de l’enroulement
secondaire
Hors spécifications → Rempla-
cer.
Fil (+) du multimètre →
fil orange 1
Fil (–) du multimètre →
Borne de bougie 2
Résistance de
l’enroulement
secondairePosition du
sélecteur du
multimètre
4,6 à 6,8 kΩ à
20 °C (68 °F)kΩ × 1
4. Contrôler:
Partie scellée de la bobine d’allu-
mage a
Broche de la borne de bougie b
Partie filetée de la bougie c
Usure → Remplacer.
SYSTEME D’ALLUMAGE

6 - 19
–+ELECIGNITION SYSTEM
AC MAGNETO INSPECTION
1. Inspect:
•Pickup coil resistance
Out of specification
→
Replace.
Tester (+) lead →
Red lead 1

Tester (–) lead →
White lead 2

Pickup coil
resistanceTester
selector
position
248 ~ 372 Ω
at
20 °C (68 °F)Ω
×
100
RW
12
NEUTRAL SWITCH INSPECTION
1. Inspect:
•Neutral switch conduct
No continuity while in neutral
→
Replace.
Continuity while in gear
→ Replace. Tester (+) lead →

Sky blue lead 1
Tester (–) lead →
Ground 2

Sb
1
Ground
2
Tester
selector
position
NEUTRAL
Ω
×
1
IN GEAR
–+ Ω×1
1
2L/W Sb
EC628000CDI UNIT INSPECTION
Check all electrical components. If
no fault is found, replace the CDI
unit. Then check the electrical com-
ponents again.CONTROLE DE L’ALTERNATEUR
AVEC ROTOR A AIMENTATION
PERMANENTE
1. Contrôler:
Résistance de la bobine d’excita-
tion
Hors spécifications → Remplacer.
Fil (+) du multimètre →
fil rouge 1
Fil (–) du multimètre → fil blanc 2
Résistance de la
bobine
d’excitationPosition du
sélecteur du
multimètre
248 à 372 Ω à
20 °C (68 °F)Ω × 100
CONTROLE DU CONTACTEUR DE
POINT MORT
1. Contrôler:
Continuité du contacteur de point
mort
Pas de continuité au point mort → Rem-
placer.
Continuité en vitesse → Remplacer. Fil (+) du multimètre →
fil bleu ciel 1
Fil (–) du multimètre → terre 2
Sb
1 Terre
2
Position du
sélecteur
du multi-
mètre
POINT
MORT
Ω × 1
EN
VITESSE
CONTROLE DU BOITIER C.D.I.
Vérifier tous les composants électriques.
Si aucun défaut n’est trouvé, remplacer
le boîtier CDI, puis vérifier à nouveau
les composants électriques.
SYSTEME D’ALLUMAGE

6 - 45
–+ELECCHARGING SYSTEM
EC680000
CHARGING SYSTEM
EC681001INSPECTION STEPS
If the battery is not charged, use the following inspection steps.
*1 marked: Refer to “FUSE INSPECTION” section in the CHAPTER 3.
*2 marked: Refer to “BATTERY INSPECTION AND CHARGING” section in the CHAPTER 3.
NOTE:•Remove the following parts before inspection.
1) Seat
2) Fuel tank
•Use the following special tool in this inspection.
*1 Check fuse.Replace fuse and check
wire harness.
*2 Check battery. Recharge or replace.
Check each coupler and wire
connection.Repair or replace.
Check charging voltage. Charging system is good.
Check AC magneto. Charging coil Replace.
Replace rectifier/regulator.
Pocket tester:
YU-3112-C/
90890-03112
No good
OK
No good
OK
No good
OK
OK
No good
No good
OK