2004 YAMAHA WR 250F oil pressure

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 capacity578 cm
3
(20.3 lmp oz,
19.5 US oz) 573 cm3
(20.2 lmp oz,
19.4 US oz) ←
Oil level 125 mm (4.92 in) 130 mm (5.12 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, AUS,
NZ, ZAEUROPE
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)----
240.5 ~ 258.5 mm
(9.47 ~ 10.18 in)←----
Spring rate, STD K = 50.0 N/mm
(5.10 kg/mm,
285.6 lb/in)K = 46.0 N/mm
(4.70 kg/mm,
263.2 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
DRIVE CHAIN STOPPER
Inspect
SWINGARMMolybdenum disulfide
grease
Inspect, lube and retighten
RELAY ARM, CONNECTING ROD Molybdenum disulfide
grease
Inspect, lube and retighten
SIDESTAND
LubricateLithium base grease
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.3-85 ~ 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)
* 1-1/2 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)
* 1-1/2 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