tire pressure YAMAHA WR 250F 2003 Owners Manual

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

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 - 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

7 - 25
TUNSETTING
EC72N000Drive and rear wheel sprockets
setting parts
* For AUS and NZ
Part name Size Part number
Drive sprocket
1 (STD) 13T 9383B-13218
Rear wheel
sprocket
2
(STD)
* (STD)48T
* 48T
* 49T
50T
* 50T
* 51T
52T
* 52T
54T5GS-25448-50
5NY-25448-00
5NY-25449-00
5GS-25450-50
5NY-25450-00
5NY-25451-00
5GS-25452-50
5NY-25452-00
5PH-25454-50
EC721002Tire pressure
Tire pressure should be adjust to suit
the road surface condition of the cir-
cuit.
Under a rainy, muddy, sandy, or
slippery condition, the tire pressure
should be lower for a larger area of
contact with the road surface.
Under a stony or hard road condi-
tion, the tire pressure should be
higher to prevent a flat tire.
Standard tire pressure:
100 kPa
(1.0 kgf/cm
2, 15 psi)
Extent of adjustment:
60 ~ 80 kPa
(0.6 ~ 0.8 kgf/cm
2,
9.0 ~ 12 psi)
Extent of adjustment:
100 ~ 120 kPa
(1.0 ~ 1.2 kgf /cm
2,
15 ~ 18 psi)
Pignon menant et couronne arrière
* AUS et NZ
Nom de pièce Taille Numéro de pièce
Pignon menant 1

(STD) 13D 9383B-13218
Couronne arrière
2

(STD)
* (STD)48D
* 48D
* 49D
50D
* 50D
* 51D
52D
* 52D
54D5GS-25448-50
5NY-25448-00
5NY-25449-00
5GS-25450-50
5NY-25450-00
5NY-25451-00
5GS-25452-50
5NY-25452-00
5PH-25454-50
Pression des pneus
Régler la pression des pneus en fonction
des conditions du terrain.
En cas de conduite sous la pluie, sur
surface boueuse, sablonneuse ou glis-
sante, réduire la pression des pneus
pour une meilleure adhésion sur le ter-
rain.
Sur route pavée ou sur surface dure,
augmenter la pression des pneus afin
d’éviter les crevaisons.
Pression des pneus
standard:
100 kPa
(1,0 kgf/cm
2, 15 psi)
Plage de réglage:
60 à 80 kPa
(0,6 à 0,8 kgf/cm
2,
9,0 à 12 psi)
Plage de réglage:
100 à 120 kPa
(1,0 à 1,2 kgf/cm
2,
15 à 18 psi)
REGLAG