wheel alignment YAMAHA WR 250F 2004 Owners Manual

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 - 83
INSP
ADJ
3. Adjust:
Drive chain slack
DRIVE CHAIN STOPPER
INSPECTION
1. Inspect:
Drive chain stopper
1
Wear indicator groove
a has
almost disappeared
→
Replace.
2. Replace:
Drive chain stopper Drive chain slack adjustment
steps:
Loosen the axle nut
1 and
locknuts
2.
Adjust the drive chain slack by
turning the adjusters
3.
To tighten → Turn the adjuster
3 counterclockwise.
To loosen → Turn the adjuster
3 clockwise and push wheel
forward.
Turn each adjuster exactly the
same amount to maintain cor-
rect axle alignment. (There are
marks
a on each side of the
drive chain puller alignment.)
NOTE:Turn the adjuster so that the drive
chain is in line with the sprocket,
as viewed from the rear.
CAUTION:
Too small drive chain slack will
overload the engine and other
vital parts; keep the slack
within the specified limits.
Tighten the axle nut while push-
ing down the drive chain.
T R..
Axle nut:
125 Nm
(12.5 m  kg, 90 ft  lb)
Tighten the locknuts.
T R..
Locknut:
16 Nm
(1.6 m  kg, 11 ft  lb)
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
1
1a
3. Régler:
Flèche de la chaîne de transmis-
sion
INSPECTION DE LA BUTEE DE
CHAINE DE TRANSMISSION
1. Contrôler:
Butée de chaîne de transmission
1
La rainure d’indication d’usure
a a presque disparu → Changer.
2. Changer:
Butée de chaîne de transmission Etapes de réglage de flèche de la
chaîne de transmission:
Desserrer l’écrou d’axe 1 et les
contre-écrous 2.
Régler la flèche de chaîne de trans-
mission en tournant les dispositifs
de réglage 3.
Pour tendre → Tourner le
dispositif de réglage 3 à gauche.
Pour détendre → Tourner le
dispositif de réglage 3 à droite
et pousser le roue vers l’avant.
Tourner chaque dispositif exacte-
ment du même nombre de tours
pour conserver l’alignement cor-
rect de la roue. (Les repères a
figurent de chaque côté sur les ten-
deurs de chaîne de transmission.)
N.B.:
Tourner le tendeur pour que la chaîne
de transmission soit alignée avec la
couronne, vue par l’arrière.
ATTENTION:
Une chaîne de transmission trop
tendue impose des efforts excessifs
au moteur et aux organes de trans-
mission; maintenir la tension de la
chaîne dans les limites spécifiées.
Serrer l’écrou de l’axe tout en
enfonçant la chaîne de transmis-
sion.
T R..
Ecrou d’axe:
125 Nm
(12,5 m  kg, 90 ft  lb)
Serrer les contre-écrous.
T R..
Contre-écrou:
16 Nm
(1,6 m  kg, 11 ft  lb)
T R..7 Nm (0,7 m · kg, 5,1 ft · lb)
CHASSIS
PARTIE CYCLE