maintenance YAMAHA WR 250F 2005 Notices Demploi (in French)

EC020000
INTRODUCTION
Congratulations on your purchase of
a Yamaha WR series. This model is
the culmination of Yamaha’s vast
experience in the production of pace-
setting racing machines. It repre-
sents the highest grade of
craftsmanship and reliability that
have made Yamaha a leader.
This manual explains operation,
inspection, basic maintenance and
tuning of your machine. If you have
any questions about this manual or
your machine, please contact your
Yamaha dealer.
NOTE:As improvements are made on this
model, some data in this manual may
become outdated. If you have any
questions, please consult your
Yamaha dealer.
WARNING
PLEASE READ THIS MANUAL
CAREFULLY AND COMPLETELY
BEFORE OPERATING THIS
MACHINE. DO NOT ATTEMPT TO
OPERATE THIS MACHINE UNTIL
YOU HAVE ATTAINED A SATIS-
FACTORY KNOWLEDGE OF ITS
CONTROLS AND OPERATING
FEATURES AND UNTIL YOU
HAVE BEEN TRAINED IN SAFE
AND PROPER RIDING TECH-
NIQUES. REGULAR INSPECTIONS
AND CAREFUL MAINTENANCE,
ALONG WITH GOOD RIDING
SKILLS, WILL ENSURE THAT YOU
SAFETY ENJOY THE CAPABILI-
TIES AND THE RELIABILITY OF
THIS MACHINE.
INTRODUCTION
Félicitations pour votre achat d’une
Yamaha séries WR. Ce modèle est
l’aboutissement de la vaste expérience
de Yamaha dans la production de machi-
nes de course. Il représente l’échelon le
plus élevé de la dextérité manuelle et de
la fiabilité qui ont fait de Yamaha un lea-
der.
Ce manuel explique le fonctionnement,
l’inspection, l’entretien de base et la
mise au point de votre machine. Si vous
avez des questions à poser à propos de ce
manuel ou de votre machine, prière de
prendre contact avec votre concession-
naire Yamaha.
N.B.:
Comme des améliorations sont faites sur
ce modèle, quelques données contenues
dans ce manuel peuvent être périmées. Si
vous avez des questions à poser, prière
de consulter votre concessionnaire
Yamaha.
AVERTISSEMENT
PRIERE DE LIRE ATTENTIVE-
MENT ET COMPLETEMENT CE
MANUEL AVANT D’UTILISER
CETTE MACHINE. NE PAS
ESSAYER D’UTILISER CETTE
MACHINE AVANT DE POSSEDER
DES CONNAISSANCES SATISFAI-
SANTES SUR SES COMMANDES
ET FONCTIONS ET D’AVOIR ETE
FORME POUR DES TECHNIQUES
DE CONDUITE CORRECTES ET
SURES. DES INSPECTION REGU-
LIERES ET UN ENTRETIEN SOI-
GNEUX, AVEC UNE BONNE
APTITUDE DE CONDUITE, VOUS
ASSURERONT LA POSSIBILITE
D’APPRECIER LES POSSIBILITES
ET LA FIABILITE DE CETTE
MACHINE.

EC050000
TO THE NEW OWNER
This manual will provide you with a
good basic understanding of fea-
tures, operation, and basic mainte-
nance and inspection items of this
machine. Please read this manual
carefully and completely before oper-
ating your new machine. If you have
any questions regarding the opera-
tion or maintenance of your machine,
please consult your Yamaha dealer.
NOTE:This manual should be considered a
permanent part of this machine and
should remain with it even if the
machine is subsequently sold.
EC060000
NOTICE
Some data in this manual may
become outdated due to improve-
ments made to this model in the
future. If there is any question you
have regarding this manual or
your machine, please consult your
Yamaha dealer.
EC070001
F.I.M. MACHINE WEIGHTS:
Weights of machines without
fuel
The minimum weights for
motocross machines are:
for the class 125 cc ..... minimum
88 kg (194 lb)
for the class 250 cc ..... minimum
98 kg (216 lb)
for the class 500 cc ..... minimum
102 kg (225 lb)
In modifying your machine (e.g.,
for weight reduction), take note of
the above limits of weight.
AU NOUVEAU
PROPRIETAIRE
Ce manuel vous apportera une connais-
sance de base des caractéristiques, du
fonctionnement, et des entretiens de base
et des délais d’inspection de cette
machine.
Veuillez lire soigneusement et entière-
ment ce manuel avant d’utiliser votre
nouvelle machine. Si vous avez des
questions concernant le fonctionnement
ou l’entretien de votre machine, veuillez
consulter votre concessionnaire Yamaha.
N.B.:
Ce manuel doit être considéré comme
partie permanente de la machine et doit
rester avec celle-ci si elle est revendue à
une tierce personne.
AVERTISSEMENT
Certaines données contenues dans ce
manuel risquent de devenir périmées
du fait d’améliorations apportées à ce
modèle dans le futur. Pour toute ques-
tion concernant ce manuel ou la
machine, consulter un concessionnaire
Yamaha.
POIDS DES MACHINES,
SPECIFICATION F.I.M.:
Poids des machines sans carburant
Poids minimum admis pour les moto-
cross:
pour la catégorie 125 cc ... minimum
88 kg (194 lb)
pour la catégorie 250 cc ... minimum
98 kg (216 lb)
pour la catégorie 500 cc ... minimum
102 kg (225 lb)
En cas de modification de la machine
(par exemple pour réduction de
poids), tenir compte des limites de
poids spécifiées ci-dessus.

E0A0000
CONTENTS
CHAPTER 1
GENERAL
INFORMATION
DESCRIPTION........................... 1-1
MACHINE IDENTIFICATION..... 1-3
IMPORTANT INFORMATION.... 1-5
CHECKING OF CONNECTION... 1-9
SPECIAL TOOLS..................... 1-11
CONTROL FUNCTIONS.......... 1-27
FUEL........................................ 1-35
STARTING AND BREAK-IN.... 1-37
TORQUE-CHECK POINTS...... 1-45
CLEANING AND STORAGE.... 1-51
CHAPTER 2
SPECIFICATIONS
GENERAL SPECIFICATIONS... 2-1
MAINTENANCE
SPECIFICATIONS...................... 2-4
GENERAL TORQUE
SPECIFICATIONS.................... 2-19
DEFINITION OF UNITS............ 2-19
CABLE ROUTING DIAGRAM... 2-97
CHAPTER 3
REGULAR
INSPECTION AND
ADJUSTMENTS
MAINTENANCE INTERVALS.... 3-1
PRE-OPERATION INSPECTION
AND MAINTENANCE............... 3-16
ENGINE.................................... 3-21
CHASSIS.................................. 3-65
ELECTRICAL......................... 3-107
TABLES DES
MATIERES
CHAPITRE 1
RENSEIGNEMENTS
GENERAUX
DESCRIPTION................................ 1-1
IDENTIFICATION DE LA
MOTO............................................... 1-3
INFORMATIONS
IMPORTANTES.............................. 1-5
VERIFICATION DES
CONNEXIONS................................ 1-9
OUTILS SPECIAUX..................... 1-14
FONCTIONS DES
COMMANDES.............................. 1-27
CARBURANT................................ 1-35
MISE EN MARCHE ET
RODAGE........................................ 1-37
POINTS DE VERIFICATION
DES COUPLES DE SERRAGE... 1-46
NETTOYAGE ET REMISAGE... 1-51
CHAPITRE 2
CARACTERISTIQUES
CARACTERISTIQUES
GENERALES................................. 2-20
CARACTERISTIQUES
D’ENTRETIEN.............................. 2-23
CARACTERISTIQUES
GENERALES DE COUPLE......... 2-38
DEFINITION DES UNITES......... 2-38
CHEMINEMENT DES
CABLES......................................... 2-98
CHAPITRE 3
CONTROLES ET
REGLAGES
PERIODIQUES
PROGRAMME D’ENTRETIEN... 3-4
CONTROLE ET ENTRETIEN
AVANT UTILISATION................ 3-17
MOTEUR....................................... 3-21
CHASSIS........................................ 3-65
PARTIE ELECTRIQUE............. 3-107

1 - 37
GEN
INFO
STARTING AND
BREAK-IN
WARNING
Never start or run the engine in a
closed area. The exhaust fumes
are poisonous; they can cause
loss of consciousness and death
in a very short time. Always oper-
ate the machine in a well-venti-
lated area.
CAUTION:
The carburetor on this machine
has a built-in accelerator pump.
Therefore, when starting the
engine, do not operate the throt-
tle or the spark plug will foul.
Unlike a two-stroke engine, this
engine cannot be kick started
when the throttle is open
because the kickstarter may
kick back. Also, if the throttle is
open the air/fuel mixture may be
too lean for the engine to start.
Before starting the machine,
perform the checks in the pre-
operation check list.
AIR FILTER MAINTENANCE
According to “AIR FILTER CLEAN-
ING” section in the CHAPTER 3,
apply the foam-air-filter oil or its
equivalent to the element. (Excess
oil in the element may adversely
affect engine starting.)
STARTING A COLD ENGINE
NOTE:This model is equipped with an igni-
tion circuit cut-off system. The
engine can be started under the fol-
lowing conditions.
When the transmission is in neu-
tral.
When the clutch is disengaged
with the transmission in any posi-
tion. However, it is recommended
to shift into neutral before starting
the engine.
MISE EN MARCHE ET
RODAGE
AVERTISSEMENT
Ne jamais démarrer ou faire tourner
le moteur dans un endroit clos. Les
gaz d’échappement sont nocifs et peu-
vent entraîner très rapidement un éva-
nouissement, voire la mort. Toujours
faire tourner le moteur dans un
endroit bien ventilé.
ATTENTION:
Le carburateur de cette moto est
équipé d’une pompe de reprise inté-
grée. Par conséquent, on ne donnera
pas de gaz en démarrant le moteur
sous peine de noyer la bougie.
A la différence d’un moteur deux
temps, ce moteur ne peut pas être
démarré au kick lorsque le papillon
est ouvert parce que le kick risque
de revenir brutalement. De même, si
le papillon est ouvert, le mélange
air/carburant risque d’être trop
pauvre pour permettre le démar-
rage du moteur.
Avant de mettre le moteur en mar-
che, effectuer les contrôles repris
dans la liste “Contrôles et entretiens
avant utilisation”.
MAINTENANCE DU FILTRE A AIR
Comme indiqué à la section “NET-
TOYAGE DU FILTRE A AIR” du
CHAPITRE 3, appliquer l’huile pour fil-
tre à air mousse ou une huile équivalente
sur la cartouche de filtre. (Un excès
d’huile dans la cartouche peut rendre le
démarrage du moteur plus difficile.)
MISE EN MARCHE A FROID
N.B.:
Ce modèle est équipé d’un coupe-circuit
d’allumage. Il est possible de démarrer le
moteur dans les conditions suivantes.
Lorsque la boîte de vitesses est au
point mort.
En débrayant, dans n’importe quelle
position de la boîte de vitesses. Il est
toutefois recommandé de revenir au
point mort avant de démarrer le
moteur.
STARTING AND BREAK-IN
MISE EN MARCHE ET RODAGE

1 - 45
GEN
INFO
TORQUE-CHECK POINTS
Frame construction Frame to rear frame
Combined seat and fuel tank Fuel tank to frame
Exhaust system Silencer to rear frame
Engine mounting Frame to engine
Engine bracket to engine
Engine bracket to frame
Steering Steering stem to handlebar Steering stem to frame
Steering stem to upper bracket
Upper bracket to handlebar
Suspension Front Steering stem to front fork Front fork to upper bracket
Front fork to lower bracket
Rear For link type Assembly of links
Link to frame
Link to rear shock absorber
Link to swingarm
Rear Installation of rear
shock absorberRear shock absorber to frame
Rear Installation of swingarm Tightening of pivot shaft
Wheel Installation of wheel Front Tightening of wheel axle
Tightening of axle holder
Rear Tightening of wheel axle
Wheel to rear wheel sprocket
Brake Front Brake caliper to front fork
Brake disc to wheel
Tightening of union bolt
Brake master cylinder to handlebar
Tightening of bleed screw
Tightening of brake hose holder
Rear Brake pedal to frame
Brake disc to wheel
Tightening of union bolt
Brake master cylinder to frame
Tightening of bleed screw
Tightening of brake hose holder
Fuel system Fuel tank to fuel cock
Lubrication system Tightening of oil hose clamp
NOTE:Concerning the tightening torque, refer to
“MAINTENANCE SPECIFICATIONS” sec-
tion in the CHAPTER 2.
TORQUE-CHECK POINTS

MAINTENANCE SPECIFICATIONS
2 - 4
SPEC
MAINTENANCE SPECIFICATIONS
ENGINE
Item Standard Limit
Cylinder head:
Warp limit ---- 0.05 mm
(0.002 in)
Cylinder:
Bore size 77.00 ~ 77.01 mm
(3.0315 ~ 3.0319 in)----
Out of round limit ---- 0.05 mm
(0.002 in)
Camshaft:
Drive method Chain drive (Left) ----
Camshaft cap inside diameter 22.000 ~ 22.021 mm
(0.8661 ~ 0.8670 in)----
Camshaft outside diameter 21.959 ~ 21.972 mm
(0.8645 ~ 0.8650 in)----
Shaft-to-cap clearance 0.028 ~ 0.062 mm
(0.0011 ~ 0.0024 in)0.08 mm
(0.003 in)
Cam dimensions
Intake“A”30.296 ~ 30.346 mm
(1.1923 ~ 1.1947 in)30.196 mm
(1.1888 in)
“B”22.45 ~ 22.55 mm
(0.8839 ~ 0.8878 in)22.35 mm
(0.8799 in)
Exhaust“A”30.399 ~ 30.499 mm
(1.1968 ~ 1.2007 in)30.299 mm
(1.1929 in)
“B”22.45 ~ 22.55 mm
(0.8839 ~ 0.8878 in)22.35 mm
(0.8799 in)
Camshaft runout limit ---- 0.03 mm
(0.0012 in)
A
B

MAINTENANCE SPECIFICATIONS
2 - 5
SPEC
Timing chain:
Timing chain type/No. of links 92RH2010-114M/114 ----
Timing chain adjustment method Automatic ----
Valve, valve seat, valve guide:
Valve clearance (cold) IN 0.10 ~ 0.15 mm
(0.0039 ~ 0.0059 in)----
EX 0.17 ~ 0.22 mm
(0.0067 ~ 0.0087 in)----
Valve dimensions:
“A” head diameter IN 22.9 ~ 23.1 mm
(0.9016 ~ 0.9094 in)----
EX 24.4 ~ 24.6 mm
(0.9606 ~ 0.9685 in)----
“B” face width IN 2.26 mm (0.089 in) ----
EX 2.26 mm (0.089 in) ----
“C” seat width IN 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
EX 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
“D” margin thickness IN 0.8 mm (0.0315 in) ----
EX 0.7 mm (0.0276 in) ----
Stem outside diameter IN 3.975 ~ 3.990 mm
(0.1565 ~ 0.1571 in)3.945 mm
(0.1553 in)
EX 4.460 ~ 4.475 mm
(0.1756 ~ 0.1762 in)4.430 mm
(0.1744 in)
Guide inside diameter IN 4.000 ~ 4.012 mm
(0.1575 ~ 0.1580 in)4.050 mm
(0.1594 in)
EX 4.500 ~ 4.512 mm
(0.1772 ~ 0.1776 in)4.550 mm
(0.1791 in)
Stem-to-guide clearance IN 0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)0.08 mm
(0.003 in)
EX 0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)0.10 mm
(0.004 in) Item Standard Limit
BC
DA
Head diameter Face width Seat width Margin thickness

MAINTENANCE SPECIFICATIONS
2 - 6
SPEC
Stem runout limit ---- 0.01 mm
(0.0004 in)
Valve seat width IN 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
EX 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
Valve spring:
Free length IN 37.81 mm (1.49 in) 36.81 mm
(1.45 in)
EX 37.54 mm (1.48 in) 36.54 mm
(1.44 in)
Set length (valve closed) IN 29.13 mm (1.15 in) ----
EX 29.30 mm (1.15 in) ----
Compressed force (installed) IN 99 ~ 114 N at 29.13 mm
(9.9 ~ 11.4 kg at 29.13 mm,
22.27 ~ 25.57 lb at 1.15 in)----
EX 126 ~ 144 N at 29.30 mm
(12.6 ~ 14.4 kg at 29.30 mm,
28.44 ~ 32.41 lb at 1.15 in)----
Tilt limit IN ---- 2.5°/1.7 mm
(2.5°/0.067 in)
EX ---- 2.5°/1.6 mm
(2.5°/0.063 in)
Direction of winding (top view) IN Clockwise ----
EX Clockwise ----
Piston:
Piston to cylinder clearance 0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in)0.1 mm
(0.004 in)
Piston size “D”76.955 ~ 76.970 mm
(3.0297 ~ 3.0303 in)----
Measuring point “H”8 mm (0.31 in) ----
Piston off-set 0.5 mm (0.020 in)/IN-side ----Item Standard Limit
*
H
D

MAINTENANCE SPECIFICATIONS
2 - 7
SPEC
Piston pin bore inside diameter 16.002 ~ 16.013 mm
(0.6300 ~ 0.6304 in)16.043 mm
(0.6316 in)
Piston pin outside diameter 15.991 ~ 16.000 mm
(0.6296 ~ 0.6299 in)15.971 mm
(0.6288 in)
Piston rings:
Top ring:
Type Barrel ----
Dimensions (B × T) 0.90 × 2.75 mm (0.04 × 0.11 in) ----
End gap (installed) 0.15 ~ 0.25 mm
(0.006 ~ 0.010 in)0.50 mm
(0.020 in)
Side clearance (installed) 0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in)0.12 mm
(0.005 in)
2nd ring:
Type Taper ----
Dimensions (B × T) 0.80 × 2.75 mm (0.03 × 0.11 in) ----
End gap (installed) 0.30 ~ 0.45 mm
(0.012 ~ 0.018 in)0.80 mm
(0.031 in)
Side clearance 0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in)0.12 mm
(0.005 in)
Oil ring:
Dimensions (B × T) 1.50 × 2.25 mm (0.06 × 0.09 in) ----
End gap (installed) 0.10 ~ 0.40 mm
(0.004 ~ 0.016 in)----
Crankshaft:
Crank width “A”55.95 ~ 56.00 mm
(2.203 ~ 2.205 in)----
Runout limit “C”0.03 mm (0.0012 in) 0.05 mm
(0.002 in)
Big end side clearance “D”0.15 ~ 0.45 mm
(0.0059 ~ 0.0177 in)0.50 mm
(0.02 in)
Small end free play “F”0.4 ~ 1.0 mm (0.02 ~ 0.04 in) 2.0 mm
(0.08 in) Item Standard Limit
T
B
B
T
B
T

MAINTENANCE SPECIFICATIONS
2 - 8
SPEC
Clutch:
Friction plate thickness 2.9 ~ 3.1 mm (0.114 ~ 0.122 in) 2.7 mm
(0.106 in)
Quantity 9 ----
Clutch plate thickness 1.1 ~ 1.3 mm (0.043 ~ 0.051 in) ----
Quantity 8 ----
Warp limit ---- 0.1 mm
(0.004 in)
Clutch spring free length 37.0 mm (1.46 in) 36.0 mm
(1.42 in)
Quantity 5 ----
Clutch housing thrust clearance 0.10 ~ 0.35 mm
(0.0039 ~ 0.0138 in)----
Clutch housing radial clearance 0.010 ~ 0.044 mm
(0.0004 ~ 0.0017 in)----
Clutch release method Inner push, cam push ----
Shifter:
Shifter type Cam drum and guide bar ----
Guide bar bending limit ---- 0.05 mm
(0.002 in)
Kickstarter:
Type Kick and ratchet type ----
Carburetor:
Type/manufacturer FCR-MX37/KEIHIN
I. D. mark 5UM8 80
Main jet (M.J) #168
Main air jet (M.A.J)ø2.0
Jet needle (J.N) OBERP-5
Cutaway (C.A) 1.5
Pilot jet (P.J) #40
Pilot air jet (P.A.J) #70
Pilot outlet (P.O)ø0.9
Pilot screw (example) (P.S) 1-3/4
Bypass (B.P)ø1.0
Valve seat size (V.S)ø3.8
Starter jet (G.S) #72
Leak jet (Acc.P) #95
Float height (F.H) 8 mm (0.31 in)
Engine idle speed 1,900 ~ 2,100 r/min
Intake vacuum 29.3 ~ 34.7 kPa
(220 ~ 260 mmHg,
8.66 ~ 10.24 inHg)
Hot starter lever free play 3 ~ 6 mm
(0.12 ~ 0.24 in) Item Standard Limit