2003 YAMAHA YZ450F oil change

4 - 57
ENG
OIL FILTER, WATER PUMP AND CRANKCASE COVER
(RIGHT)
REMOVAL POINTS
EC4G3110
Impeller shaft
1. Remove:
Impeller 1
Plain washer 2
Impeller shaft 3
NOTE:
Hold the impeller shaft on its width across the
flats a with spanners, etc. and remove the
impeller.
EC4G3210
Oil seal
NOTE:
It is not necessary to disassemble the water
pump, unless there is an abnormality such as
excessive change in coolant level, discolora-
tion of coolant, or milky transmission oil.
1. Remove:
Bearing 1
Oil seal 2
INSPECTION
EC444200
Impeller shaft
1. Inspect:
Impeller shaft 1
Bend/wear/damage → Replace.
Fur deposits → Clean.

5 - 3
CHAS

ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
AUSBAU
Hinterrad
1. Demontieren:

Rad
1

HINWEIS:

Das Rad nach vorne stoßen und die Antriebs-
kette
2
abnehmen.
Radlager (nach Bedarf)
1. Demontieren:

Lager
1

HINWEIS:

Die Lager mit einem Lageraustreiber
2
aus-
bauen.
PRÜFUNG
Rad
1. Messen:

Felgenschlag
Unvorschriftsmäßig
→
Instand setzen/
Erneuern.
Max. Felgenschlag
Höhenschlag
1
: 2,0 mm
Seitenschlag
2
: 2,0 mm
2. Kontrollieren:

Lager
Den inneren Laufring mit dem Finger
drehen.
Schwergängigkeit/Freßspuren
→

Erneuern.
HINWEIS:

Lager, Dichtringe und Hülse im Satz erneuern.
POINTS DE DEPOSE
Roue arrière
1. Déposer:

Roue
1

N.B.:

Pousser la roue vers l’avant et déposer la chaîne de
transmission
2
.
Roulement de roue (si nécessaire)
1. Déposer:

Roulement
1
N.B.:

Déposer le roulement en utilisant un arrache-roule-
ment courant
2
.
CONTROLE
Roue
1. Mesure:

Voile de roue
Hors limite
→
Réparer/changer.
Limite de voile de la roue:
Radial 1: 2,0 mm (0,08 in)
Latéral 2: 2,0 mm (0,08 in)
2. Contrôler:
Roulement
Faire tourner la bague intérieure avec le
doigt.
Point dur/grippage → Changer.
N.B.:
Changer à la fois les roulements, la bague d’étan-
chéité et la collerette de roue.

5 - 4
CHAS
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
Radachse
1. Messen:
Radachsschlag
Unvorschriftsmäßig → Erneuern.
Die Meßuhr 1 verwenden.
HINWEIS:
Der Radachsschlag entspricht der Hälfte der
Meßuhranzeige.
WARNUNG
Nie versuchen, eine verbogene Achse zu
richten.
Max. Radachsschlag
0,5 mm
Bremsscheibe
1. Messen:
Bremsscheibenschlag (nur Hinterrad-
Bremsscheibe)
Die Meßuhr 1 verwenden.
Unvorschriftsmäßig → Felgenschlag
prüfen.
Falls im Sollbereich, die Bremsscheibe
erneuern.
2. Messen:
Bremsscheibenstärke a
Unvorschriftsmäßig → Erneuern.
Max. Bremsscheibenverzug
Standard
Hinten—0,15 mm
Bremsscheiben-Mindeststärke
Standard
Vorn 3,0 mm 2,5 mm
Hinten4,0 mm 3,5 mm
Axe de roue
1. Mesurer:
Les flexions de l’axe de roue
Hors-spécification → Changer.
Utiliser le comparateur 1.
N.B.:
La valeur de flexion est égale à la moitié de la lec-
ture du comparateur.
AVERTISSEMENT
Ne jamais tenter de redresser un axe tordu.
Limite de torsion de l’axe de roue:
0,5 mm (0,020 in)
Disque de frein
1. Mesurer:
Déflexion de disque de frein (disque de
frein arrière uniquement)
Utiliser le comparateur 1.
Hors spécification → Examiner le voile de
roue.
Si le voile de la roue est normal, changer le
disque de frein.
2. Mesurer:
Epaisseur de disque de frein a
Hors limite → Changer.
Limite de déflexion de disque:
Standard
Arrière—0,15 mm
(0,006 in)
Limite d’usure de disque:
Standard
Avant3,0 mm (0,12 in) 2,5 mm (0,10 in)
Arrière 4,0 mm (0,16 in) 3,5 mm (0,14 in)

7 - 12
TUNSETTING
EC722011
Front fork setting
The front fork setting should be made depend-
ing on the rider’s feeling of an actual run and
the circuit conditions.
The front fork setting includes the following
three factors:
1. Setting of air spring characteristics
Change the fork oil level.
2. Setting of spring preload
Change the spring.
Install the adjustment washer.
3. Setting of damping force
Change the compression damping.
Change the rebound damping.
The spring acts on the load and the
damping force acts on the cushion
travel speed.
EC723001
Change in level and characteristics of fork
oil
Damping characteristic near the final stroke
can be changed by changing the fork oil
amount.
CAUTION:
Adjust the oil level in 5 mm (0.2 in) incre-
ments or decrements. Too low oil level
causes the front fork to produce a noise at
full rebound or the rider to feel some pres-
sure on his hands or body. Alternatively,
too high oil level will develop unexpectedly
early oil lock with the consequent shorter
front fork travel and deteriorated perfor-
mance an characteristics. Therefore, adjust
the front fork within the specified range.
ÅAir spring characteristics in relation to oil level
change
ıLoad
ÇStroke
1Max. oil level
2Standard oil level
3Min. oil level
Standard oil level:
135 mm (5.31 in)
Extent of adjustment:
80 ~ 150 mm (3.15 ~ 5.91 in)
From top of outer tube with
inner tube and damper rod fully
compressed without spring.
Å

7 - 20
TUNSETTING
EC72H002
Suspension setting
Front fork
NOTE:
If any of the following symptoms is experienced with the standard position as the base, make
resetting by reference to the adjustment procedure given in the same chart.
Before any change, set the rear shock absorber sunken length to the standard figure 90 ~
100 mm (3.5 ~ 3.9 in).
SymptomSection
Check Adjust
JumpLarge
gapMedium
gapSmall
gap
Stiff over entire range

Compression damping
Oil level (oil amount)
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with soft spring.
Unsmooth movement
over entire range

Outer tube
Inner tube
Under bracket tightening
torqueCheck for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Retighten to specified torque.
Poor initial
movement

Rebound damping
Oil sealTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Apply grease in oil seal wall.
Soft over entire range,
bottoming out

Compression damping
Oil level (oil amount)
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Increase oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with stiff spring.
Stiff toward stroke end
Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke end,
bottoming out
Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial movement
Compression dampingTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low front, tending to
lower front posture

Compression damping
Rebound damping
Balance with rear end
Oil level (oil amount)Turn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 95 ~ 100 mm (3.7 ~ 3.9 in) when
one passenger is astride seat (lower rear posture).
Increase oil level by about 5 mm (0.2 in).
“Obtrusive” front, tend-
ing to upper front pos-
ture

Compression damping
Balance with rear end
Spring
Oil lever (oil amount)Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 90 ~ 95 mm (3.5 ~ 3.7 in) when
one passenger is astride seat (upper rear posture).
Replace with soft spring.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).