2005 YAMAHA WR 250F check oil

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–+ELECTHROTTLE POSITION SENSOR SYSTEM
THROTTLE POSITION SENSOR SYSTEM
INSPECTION STEPS
If the throttle position sensor will not operate, use the following inspection steps.
NOTE:Use the following special tools in this inspection.
Check entire ignition
system for connection.Repair or replace.
Check throttle position sensor.Throttle position
sensor coilReplace.
Check CDI unit.Throttle position
sensor input
voltageReplace.
Pocket tester:
YU-3112-C/
90890-03112
No good
OK
No good
OK
No good

6 - 59
–+ELECTHROTTLE POSITION SENSOR SYSTEM
HANDLING NOTE
CAUTION:
Do not loosen the screws (throttle
position sensor) 1
except when
changing the throttle position sen-
sor due to failure because it will
cause a drop in engine perfor-
mance.
1
EC624000COUPLERS AND LEADS
CONNECTION INSPECTION
1. Check:
Couplers and leads connec-
tion
Rust/dust/looseness/short-cir-
cuit
→ Repair or replace.
THROTTLE POSITION SENSOR
COIL INSPECTION
1. Inspect:
Throttle position sensor coil
resistance
Out of specification
→
Replace.
Tester (+) lead →
Blue lead 1

Tester (–) lead →
Black lead 2
Throttle
position
sensor coil
resistanceTester
selector
position
4 ~ 6 kΩ at
20 °C (68 °F)kΩ × 1
2. Loosen:
Throttle stop screw 1
NOTE:Turn out the throttle stop screw until
the throttle shaft is in the full close
position.
REMARQUES CONCERNANT LA
MANIPULATION
ATTENTION:
Ne pas desserrer les vis (capteur de
position de papillon des gaz) 1 sauf
en cas de remplacement du capteur de
position de papillon des gaz en raison
d’une panne, car cela provoquerait
une baisse des performances du
moteur.
CONTROLE DES CONNEXIONS
DES FICHES RAPIDES ET DES
FILS
1. Contrôler:
Connexion des fiches rapides et
des fils
Rouille/poussière/jeu/court-cir-
cuit → Réparer ou remplacer.
CONTROLE DE LA BOBINE DU
CAPTEUR DE POSITION DE
PAPILLON DES GAZ
1. Contrôler:
Résistance de la bobine du cap-
teur de position de papillon des
gaz
Hors spécifications → Rempla-
cer.
Fil (+) du multimètre → fil bleu 1
Fil (–) du multimètre → fil noir 2
Résistance de la
bobine du
capteur de
position de
papillon des gazPosition du
sélecteur du
multimètre
4 à 6 kΩ à 20 °C
(68 °F)kΩ × 1
2. Desserrer:
Vis de butée de papillon des gaz
1
N.B.:
Dévisser la vis de butée de papillon des
gaz jusqu’à ce que l’axe de papillon soit
en position complètement fermée.
SYSTEME DU CAPTEUR DE POSITION DE PAPILLON DES GAZ

6 - 61
–+ELECTHROTTLE POSITION SENSOR SYSTEM
3. Inspect:
Throttle position sensor coil
variable resistance
Check that the resistance in
increased as the throttle grip is
moved from the full close posi-
tion to the full open position.
Out of specification
→
Replace.
Tester (+) lead →
Yellow lead 1

Tester (–) lead →
Black lead 2

Throttle
position sensor
coil variable
resistanceTester
selector
position
Full
closedFull
opened
kΩ
×
1 Zero ~
3 kΩ
at
20 °C
(68 °F)4 ~ 6 kΩ

at 20 °C
(68 °F)
THROTTLE POSITION SENSOR
REPLACEMENT AND
ADJUSTMENT
1. Remove:
Throttle position sensor cou-
pler
Screw
(throttle position sensor)
1
Throttle position sensor
2
NOTE:Loosen the screws (throttle position
sensor) using the T25 bit.
2. Replace:
Throttle position sensor
12
3. Install:
Throttle position sensor
1
Screw
(throttle position sensor)
2
Throttle position sensor cou-
pler
NOTE:Align the slot
a in the throttle posi-
tion sensor with the projection b
on the carburetor.
Temporarily tighten the screws
(throttle position sensor).
21
b
a
3. Contrôler:
Résistance variable de la bobine
du capteur de position de papillon
des gaz
Vérifier que la résistance aug-
mente lorsque l’on déplace la poi-
gnée des gaz de la position
complètement fermée à la posi-
tion complètement ouverte.
Hors spécifications → Remplacer.
Fil (+) du multimètre →
fil jaune 1
Fil (–) du multimètre → fil noir 2
Résistance variable
de la bobine du cap-
teur de position de
papillon des gazPosition du
sélecteur
du multi-
mètre
Complète-
ment
ferméComplète-
ment
ouvert
kΩ × 1
Zéro à
3 kΩ à
20 °C
(68 °F)4 à 6kΩ
à 20 °C
(68 °F)
REMPLACEMENT ET REGLAGE
DU CAPTEUR DE POSITION DE
PAPILLON DES GAZ
1. Déposer:
Fiche rapide du capteur de posi-
tion de papillon des gaz
Vis
(capteur de position de papillon
des gaz) 1
Capteur de position de papillon
des gaz 2
N.B.:
Desserrer les vis (capteur de position de
papillon des gaz) à l’aide de la mèche T25.
2. Remplacer:
Capteur de position de papillon
des gaz
3. Monter:
Capteur de position de papillon
des gaz 1
Vis
(capteur de position de papillon
des gaz) 2
Fiche rapide du capteur de posi-
tion de papillon des gaz
N.B.:
Aligner la fente a du capteur de posi-
tion de papillon des gaz avec la saillie
b du carburateur.
Serrer provisoirement les vis (capteur
de position de papillon des gaz).
SYSTEME DU CAPTEUR DE POSITION DE PAPILLON DES GAZ

6 - 67
–+ELECLIGHTING SYSTEM
LIGHTING SYSTEM
INSPECTION STEPS
Refer to the following flow chart when inspecting the ignition system for possible problems.
NOTE:Replace the bulb and/or bulb socket.
1) Seat
2) Fuel tank
Use the following special tool.
Check the bulb and bulb socket.Replace the bulb and/or
bulb socket.
Check the AC magneto. Lighting coil Replace.
Check the entire lighting system
proper for connections.Repair or replace.
Check the rectifier/regulator. Out-put voltage Replace.
Pocket tester:
YU-3112-C/
90890-03112
No good
OK
No good
OK
Improperly connected
OK
No good

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).