oil pressure YAMAHA WR 250F 2003 Owners Manual

1 - 5
GEN
INFOIMPORTANT INFORMATION
EC130000
IMPORTANT
INFORMATION
EC131010PREPARATION FOR REMOVAL
AND DISASSEMBLY
1. Remove all dirt, mud, dust, and
foreign material before removal
and disassembly.
When washing the machine with
high pressured water, cover the
parts follows.
Silencer exhaust port
Side cover air intake port
Water pump housing hole at
the bottom
Drain hole on the cylinder
head
(right side)
All electrical components
2. Use proper tools and cleaning
equipment. Refer to “SPECIAL
TOOLS” section.
3. When disassembling the
machine, keep mated parts
together. They include gears,
cylinders, pistons, and other
mated parts that have been
“mated” through normal wear.
Mated parts must be reused as
an assembly or replaced.
4. During the machine disassem-
bly, clean all parts and place
them in trays in the order of dis-
assembly. This will speed up
assembly time and help assure
that all parts are correctly rein-
stalled.
5. Keep away from fire.
EC132000ALL REPLACEMENT PARTS
1. We recommend to use Yamaha
genuine parts for all replace-
ments. Use oil and/or grease
recommended by Yamaha for
assembly and adjustment.
INFORMATIONS
IMPORTANTES
PREPARATION POUR LA DEPOSE
ET DEMONTAGE
1. Eliminer soigneusement crasse,
boue, poussière et corps étrangers
avant la dépose et le démontage.
Avant de laver le véhicule à l’eau
pressurisée, recouvrir les parties
suivantes.
Sortie de silencieux
Entrée d’air sur le cache latéral
Orifice au fond du carter de la
pompe à eau
Trou de vidange sur la culasse
(côté droit)
Tous les composants électriques
2. Utiliser les outils et le matériel de
nettoyage correct. Se reporter à la
section “OUTILS SPECIAUX”.
3. Lors du démontage de la machine,
garder les pièces connexes ensem-
ble. Ils comprennent les engrenages,
cylindres, pistons et autres pièces
connexes qui se sont “accouplées”
par usure normale. Les pièces con-
nexes doivent être réutilisées en un
ensemble ou changées.
4. Lors du démontage de la machine,
nettoyer toutes les pièces et les met-
tre dans des plateaux dans l’ordre
du démontage. Ceci diminuera le
temps de remontage et permettra
d’être sûr que toutes les pièces sont
correctement remontées.
5. Tenir éloigné du feu.
PIECES DE RECHANGE
1. Nous recommandons d’utiliser des
pièces Yamaha d’origine pour tous
les remplacements. Utiliser les hui-
les/graisses recommandées par
Yamaha lors des remontages et
réglages.
INFORMATIONS IMPORTANTES

GENERAL SPECIFICATIONS
2 - 2
SPEC
Oil capacity:
Engine oil
Periodic oil change 1.2 L (1.06 Imp qt, 1.27 US qt)
With oil filter replacement 1.3 L (1.14 Imp qt, 1.37 US qt)
Total amount 1.4 L (1.23 Imp qt, 1.48 US qt)
Coolant capacity (including all routes): 1.3 L (1.14 Imp qt, 1.37 US qt)
Air filter: Wet type element
Fuel:
Type Premium unleaded gasoline only with a
research octane number of 95 or higher.
(Except for ZA)
Premium gasoline (For ZA)
Tank capacity 10 L (2.2 Imp gal, 2.64 US gal)
Reserve 1.2 L (0.26 Imp gal, 0.32 US gal)
Carburetor:
Type FCR-MX37
Manufacturer KEIHIN
Spark plug:
Type/manufacturer CR8E/NGK (resistance type)
Gap 0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
Clutch type: Wet, multiple-disc
Transmission:
Primary reduction system Gear
Primary reduction ratio 57/17 (3.353)
Secondary reduction system Chain drive
Secondary reduction ratio 52/13 (4.000)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 31/13 (2.385)
2nd 28/16 (1.750)
3rd 28/21 (1.333)
4th 25/24 (1.042)
5th 22/27 (0.815)
Chassis:
Frame type Semi double cradle
Caster angle 27.1°
Trail 117.4 mm (4.62 in)
Tire:
Type With tube
Size (front) 80/100-21 51M (For USA, CDN and ZA)
90/90-21 54R (For EUROPE, AUS and NZ)
Size (rear) 100/100-18 59M (For USA, CDN and ZA)
130/90-18 69R (For EUROPE, AUS and NZ)
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm
2, 15 psi)
1
2
3
4
5
6
7

MAINTENANCE SPECIFICATIONS
2 - 9
SPEC
Lubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less
(0.0047 in or less)0.20 mm
(0.008 in)
Side clearance 0.09 ~ 0.17 mm
(0.0035 ~ 0.0067 in)0.24 mm
(0.009 in)
Housing and rotor clearance 0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)0.17 mm
(0.0067 in)
Cooling:
Radiator core size
Width 117.8 mm (4.6 in) ----
Height 220 mm (8.7 in) ----
Thickness 32 mm (1.26 in) ----
Radiator cap opening pressure 110 kPa (1.1 kg/cm
2, 15.6 psi) ----
Radiator capacity (total) 0.6 L (0.53 Imp qt, 0.63 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit

MAINTENANCE SPECIFICATIONS
2 - 12
SPEC
CHASSIS
Item Standard Limit
Steering system:
Steering bearing type Taper roller bearing ----
Front suspension: USA, CDN EUROPE AUS, NZ, ZA
Front fork travel 300 mm (11.8 in)←←
Fork spring free length 460 mm (18.1 in)←←
Spring rate, STD K = 4.31 N/mm
(0.44 kg/mm,
24.6 lb/in)K = 4.12 N/mm
(0.42 kg/mm,
23.5 lb/in)K = 4.22 N/mm
(0.43 kg/mm,
24.1 lb/in)
Optional spring/spacer Yes←←
Oil capacity568 cm
3
(20.0 lmp oz,
19.2 US oz) 573 cm3
(20.2 lmp oz,
19.4 US oz) 578 cm3
(20.3 lmp oz,
19.5 US oz)
Oil level 135 mm (5.31 in) 130 mm (5.12 in) 125 mm (4.92 in)

(From top of outer tube with inner
tube and damper rod fully com-
pressed without spring.)80 ~ 150 mm
(3.15 ~ 5.91 in)←←
Oil grade Suspension oil
“01”←←
Inner tube outer diameter 46 mm (1.81 in)←←
Front fork top end 5 mm (0.20 in)←10 mm (0.39 in)
Rear suspension: USA, CDN EUROPE AUS, NZ, ZA
Shock absorber travel 132 mm (5.20 in)←←
Spring free length
260 mm (10.24 in)←←
Fitting length 245 mm (9.65 in)
246.5 mm (9.70 in)245 mm (9.65 in)
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)←←
Spring rate, STD K = 49.0 N/mm
(5.00 kg/mm,
280.0 lb/in)K = 46.0 N/mm
(4.70 kg/mm,
263.2 lb/in)K = 50.0 N/mm
(5.10 kg/mm,
285.6 lb/in)
Optional spring Yes←←
Enclosed gas pressure
1,000 kPa
(10 kg/cm2, 142 psi)
←←
Swingarm:
Swingarm free play limit
End ---- 1.0 mm
(0.04 in)

3 - 3
INSP
ADJ
MAINTENANCE INTERVALS
*marked: For USAFRONT FORKS
Inspect and adjust
Replace oilSuspension oil “01”
Replace oil seal
FRONT FORK OIL SEAL AND DUST SEAL
Clean and lubeLithium base grease
REAR SHOCK ABSORBER
Inspect and adjust
Lube
(After
rain
ride)Molybdenum disulfide
grease
Retighten
DRIVE CHAIN GUIDE AND ROLLERS
Inspect
SWINGARMMolybdenum disulfide
grease
Inspect, lube and retighten
RELAY ARM, CONNECTING ROD Molybdenum disulfide
grease
Inspect, lube and retighten
STEERING HEAD
Inspect free play and retighten
Clean and lubeLithium base grease
Replace bearing
TIRE, WHEELS
Inspect air pressure, wheel run-out, tire
wear and spoke looseness
Retighten sprocket bolt
Inspect bearings
Replace bearings
LubricateLithium base grease
THROTTLE, CONTROL CABLE Yamaha cable lube or SAE
10W-30 motor oil
Inspect dirt and wear on the
throttle cable on the
carburetor side. Check routing and connection
Lubricate
Inspect and clean (throttle cable)
HOT STARTER, CLUTCH LEVER
Inspect free play
BATTERY
Check terminal for looseness and
corrosionItemAfter
break-inEvery
race
Every third
(or
500 km)Every fifth
(or
1,000 km)As
requiredRemarks

3 - 16
INSP
ADJ
PRE-OPERATION INSPECTION AND MAINTENANCE
EC320000
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating condition.
Before using this machine, check the following points.
GENERAL INSPECTION AND MAINTENANCE
Item Routine Page
CoolantCheck that coolant is filled up to the radiator cap.
Check the cooling system for leakage.P.3-21 ~ 29
FuelCheck that a fresh gasoline is filled in the fuel tank. Check the
fuel line for leakage.P.1-35
Engine oilCheck that the oil level is correct. Check the crankcase and
frame oil line for leakage.P.3-39 ~ 47
Gear shifter and clutchCheck that gears can be shifted correctly in order and that the
clutch operates smoothly.P.3-29 ~ 31
Throttle grip/HousingCheck that the throttle grip operation and free play are correctly
adjusted. Lubricate the throttle grip and housing, if necessary.P.3-31 ~ 33
Brakes Check the play of front brake and effect of front and rear brake. P.3-65 ~ 77
Drive chainCheck drive chain slack and alignment. Check that the drive
chain is lubricated properly.P.3-79 ~ 83
WheelsCheck for excessive wear and tire pressure. Check for loose
spokes and have no excessive play.P.3-99 ~ 101
SteeringCheck that the handlebar can be turned smoothly and have no
excessive play.P.3-101 ~ 103
Front forks and rear shock
absorberCheck that they operate smoothly and there is no oil leakage. P.3-83 ~ 97
Cables (wires)Check that the clutch and throttle cables move smoothly. Check
that they are not caught when the handlebars are turned or when
the front forks travel up and down.—
Exhaust pipeCheck that the exhaust pipe is tightly mounted and has no
cracks.P.4-7 ~ 11
Rear wheel sprocket Check that the rear wheel sprocket tightening bolt is not loose. P.3-77
Lubrication Check for smooth operation. Lubricate if necessary. P.3-105
Bolts and nuts Check the chassis and engine for loose bolts and nuts. P.1-45
Lead connectorsCheck that the AC magneto, CDI unit, and ignition coil are
connected tightly.P.1-9
SettingsIs the machine set suitably for the condition of the racing course
and weather or by taking into account the results of test runs
before racing? Are inspection and maintenance completely
done?P.7-1 ~ 42

3 - 47
INSP
ADJ
OIL PRESSURE INSPECTION
1. Check:
Oil pressure
Checking steps:
Slightly loosen the oil pressure
check bolt
1.
Start the engine and keep it
idling until oil starts to seep from
the oil pressure check bolt. If no
oil comes out after one minute,
turn the engine off so it will not
seize.
Check oil passages and oil
pump for damage or leakage.
Start the engine after solving
the problem(s) and recheck the
oil pressure.
Tighten the oil pressure check
bolt.
T R..
Oil pressure check bolt:
10 Nm
(1.0 m  kg, 7.2 ft  lb)
PILOT SCREW ADJUSTMENT
1. Adjust:
Pilot screw
1
* Except for USAAdjustment steps:
NOTE:To optimize the fuel flow at a
smaller throttle opening, each
machine’s pilot screw has been
individually set at the factory.
Before adjusting the pilot screw,
turn it in fully and count the num-
ber of turns. Record this number
as the factory-set number of turns
out.
Turn in the pilot screw until it is
lightly seated.
Turn out the pilot screw by the
factory-set number of turns.
Pilot screw:
2 turns out (example)
* 1-7/8 turns out
CONTROLE DE LA PRESSION
D’HUILE
1. Contrôler:
Pression d’huile
REGLAGE DE LA VIS DE
RICHESSE
1. Régler:
Vis de richesse 1
* Excepté USA Etapes du contrôle:
Desserrer légèrement le boulon 1
de contrôle de la pression d’huide.
Lancer le moteur et le laisser tour-
ner au ralenti jusqu’à ce que l’huile
commence à suinter au niveau du
boulon de la rampe de graissage. Si
l’huile ne sort pas après une
minute, arrêter le moteur pour évi-
ter qu’il ne grippe.
Vérifier les passages d’huile et la
pompe à huile pour voir s’il y a des
fuites ou des dégâts.
Mettre le moteur en marche après
avoir remédié au(x) problème(s) et
vérifier à nouveau la pression
d’huile.
Serrer le boulon de contrôle de la
pression d’huile au couple indiqué.
T R..
Boulon de contrôle de la
pression d’huile:
10 Nm
(1,0 m  kg, 7,2 ft  lb)
Etapes de réglage:
N.B.:
Afin d’optimiser le flux de carburant
à plus petite ouverture des gaz, la vis
de richesse de chaque véhicule a été
réglée individuellement à l’usine.
Avant de régler la vis de richesse, la
visser complètement en comptant le
nombre de tours exact. Noter ce chif-
fre et dévisser la vis de ce nombre de
tours.
Visser la vis de richesse jusqu’à ce
qu’elle touche légèrement son
siège.
Dévisser la vis de richesse du nom-
bre de tour réglé à l’usine.
Vis de richesse:
2 tours en arrière
(exemple)
* 1-7/8 tours en arrière
ENGINE
MOTEUR

3 - 79
INSP
ADJ
DRIVE CHAIN INSPECTION
1. Remove:
Drive chain
1
NOTE:Remove the drive chain using a drive
chain cutter
2.
2. Clean:
Drive chain
Brush off as much dirt as pos-
sible. Then clean the drive
chain using the chain cleaner.
CAUTION:
This machine has a drive chain
with small rubber O-rings 1
between the side plates. Steam
cleaning, high-pressure washes,
certain solvent and kerosene can
damage these O-rings.
1
3. Inspect:
O-ring
1 (drive chain)
Damage
→ Replace the drive
chain.
Roller
2
Side plate
3
Damage/wear → Replace the
drive chain.
4. Measure:
Drive chain length (10 links) a
Out of specification →
Replace.
Drive chain length
(10 links):
:
150.1 mm (5.91 in)
5. Check:
Drive chain stiffness a
Clean and oil the drive chain
and hold as illustrated.
Stiff → Replace the drive
chain.
CONTROLE DE LA CHAINE DE
TRANSMISSION
1. Déposer:
Chaîne de transmission 1
N.B.:
Déposer la chaîne de transmission à
l’aide d’un découpe-chaîne 2.
2. Nettoyer:
Chaîne de transmission
Brosser la chaîne pour enlever le
plus de saleté possible. Nettoyer
ensuite la chaîne avec un produit
de nettoyage pour chaîne.
ATTENTION:
Des petits joints toriques en caout-
chouc 1 sont montés entre les flas-
ques des maillons de la chaîne de
transmission. Le nettoyage à la
vapeur, les lavages à haute pression,
certains dissolvants et le kérosène peu-
vent endommager ces joints toriques.
3. Contrôler:
Joints toriques 1 (chaîne de
transmission)
Endommagement → Remplacer
la chaîne de transmission.
Rouleau 2
Flasques 3
Endommagement/usure → Rem-
placer la chaîne de transmission.
4. Mesurer:
Longueur de chaîne de transmis-
sion (10 maillons) a
Hors spécification → Remplacer.
Longueur limite de la
chaîne de transmission
(10 maillons):
:
150,1 mm (5,91 in)
5. Contrôler:
Raideur de la chaîne de transmis-
sion a
Nettoyer et huiler la chaîne de
transmission et la tenir comme
représenté sur l’illustration.
Raideur → Remplacer la chaîne
de transmission.
CHASSIS
PARTIE CYCLE

3 - 85
INSP
ADJ
EC36D001FRONT FORK OIL SEAL AND
DUST SEAL CLEANING
1. Remove:
Protector
Dust seal
1
NOTE:Use a thin screw driver, and be care-
ful not to damage the inner fork tube
and dust seal.
2. Clean:
Dust seal
a
Oil seal
b
NOTE:Clean the dust seal and oil seal
after every run.
Apply the lithium soap base grease
on the inner tube.
FRONT FORK INTERNAL
PRESSURE RELIEVING
NOTE:If the front fork initial movement feels
stiff during a run, relieve the front fork
internal pressure.
1. Elevate the front wheel by plac-
ing a suitable stand under the
engine.
2. Remove the air bleed screw
1
and release the internal pressure
from the front fork.
3. Install:
Air bleed screw
T R..1 Nm (0.1 m · kg, 0.7 ft · lb)
NETTOYAGE DE BAGUE
D’ETANCHEITE ET DE JOINT
ANTIPOUSSIERE DE FOURCHE
AVANT
1. Déposer:
Protection
Joint antipoussière 1
N.B.:
Utiliser un petit tournevis et faire atten-
tion à ne pas endommager le fourreau de
fourche interne ni le cache-poussière.
2. Nettoyer:
Joint antipoussière a
Bague d’étanchéité b
N.B.:
Nettoyer le joint antipoussière et la
bague d’étanchéité après chaque
course.
Appliquer la graisse à base de savon
au lithium sur le tube interne.
PURGE DE L’AIR DE LA
FOURCHE AVANT
N.B.:
Si le mouvement initial de la fourche
avant montre une certaine raideur à l’uti-
lisation, purger l’air de la fourche avant.
1. Surélever la fourche avant en pla-
çant un support adéquat sous le
moteur.
2. Enlever la vis de purge d’air 1
pour purger la fourche avant.
3. Monter:
Vis de purge d’air
T R..1 Nm (0,1 m · kg, 0,7 ft · lb)
CHASSIS
PARTIE CYCLE

3 - 99
INSP
ADJ
EC36Q000TIRE PRESSURE CHECK
1. Measure:
Tire pressure
Out of specification
→ Adjust.
NOTE:Check the tire while it is cold.
Loose bead stoppers allow the tire
to slip off its position on the rim
when the tire pressure is low.
A tilted tire valve stem indicates
that the tire slips off its position on
the rim.
If the tire valve stem is found tilted,
the tire is considered to be slipping
off its position. Correct the tire
position.
Standard tire pressure:
100 kPa
(1.0 kgf/cm
2, 15 psi)
EC36S002SPOKES INSPECTION AND
TIGHTENING
1. Inspect:
Spokes
1
Bend/damage
→ Replace.
Loose spoke
→ Retighten.
2. Tighten:
Spokes
NOTE:Be sure to retighten these spokes
before and after break-in. After a
practice or a race check spokes for
looseness.
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)
EC36T000WHEEL INSPECTION
1. Inspect:
Wheel runout
Elevate the wheel and turn it.
Abnormal runout
→ Replace.
CONTROLE DE PRESSION DES
PNEUS
1. Mesurer:
Pression des pneus
Hors spécification → Régler.
N.B.:
Vérifier le pneu alors qu’il est froid.
Des butées de bourrelet lâches permet-
tent au pneu de se détacher de sa posi-
tion sur la jante lorsque la pression des
pneus est basse.
Une tige de soupape de pneu inclinée
indique que le pneu se détache de sa
position sur la jante.
Si la tige de soupape de pneu est incli-
née, le pneu a tendance à se détacher
de sa position. Corriger la position du
pneu.
Pression des pneus
standard:
100 kPa
(1,0 kgf/cm
2, 15 psi)
CONTROLE ET SERRAGE DES
RAYONS
1. Contrôler:
Rayons 1
Déformation/endommagement →
Remplacer.
Rayons desserrés → Resserrer.
2. Serrer:
Rayon
N.B.:
Ne pas oublier de retendre les rayons
avant et après le rodage. Après un entraî-
nement ou une course, contrôler si les
rayons ne sont pas détendus.
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
CONTROLE DE LA ROUE
1. Contrôler:
Voile de roue
Soulever la roue et la tourner.
Voile excessif → Remplacer.
CHASSIS
PARTIE CYCLE