2002 YAMAHA YZ250F Oil change

5 - 3
CHAS

ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
RUOTA ANTERIORE E RUOTA POSTERIORE
AUSBAU
Hinterrad
1. Demontieren:

Rad
1

HINWEIS:

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

Lager
1

HINWEIS:

Die Lager mit einem Lageraustreiber
2
ausbauen.
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/Freßspu-
ren
→
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-roulement courant 2.
CONTROLE
Roue
1. Mesure:
Voile de roue
Hors limite → Réparer/rempla-
cer.
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 inté-
rieure avec le doigt.
Point dur/grippage → Rempla-
cer.
N.B.:
Changer à la fois les roulements, la
bague d’étanchéité et la collerette de
roue.PUNTI DI RIMOZIONE
Ruota posteriore
1. Rimuovere:
Ruota 1
NOTA:
Spingere la ruota in avanti e rimuovere
la catena di trasmissione 2.
Cuscinetto della ruota (se necessario)
1. Rimuovere:
Cuscinetto 1
NOTA:
Rimuovere il cuscinetto impiegando un
estrattore per cuscinetti 2.
ISPEZIONE
Ruota
1. Misurare:
Scentratura
Fuori limite → Riparare/sosti-
tuire.
Limite di disassamento
ruota:
Radiale 1: 2,0 mm
(0,08 in)
Laterale 2: 2,0 mm
(0,08 in)
2. Ispezionare:
Cuscinetto
Far ruotare l’anello interno con
un dito.
Punti rugosi/grippaggio →
Sostituire.
NOTA:
Sostituire in blocco i cuscinetti, il parao-
lio ed il collarino della ruota.

5 - 4
CHAS
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
RUOTA ANTERIORE E RUOTA POSTERIORE
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 → Fel-
genschlag prüfen.
Falls im Sollbereich, die
Bremsscheibe erneuern.
2. Messen:
Bremsscheibenstärke a
Unvorschriftsmäßig →
Erneuern.
Max. Bremsscheiben-
verzug
Hinten
0,15 mm
Bremsscheiben-Min-
deststärke
Vorn
3,0 mm
2,5 mm
Hinten
4,0 mm
3,5 mm
Axe de roue
1. Mesurer:
Déformation de l’axe de roue
Hors-spécification → Rempla-
cer.
Utiliser le comparateur 1.
N.B.:
La valeur de déformation est égale à la
moitié de la lecture du comparateur.
AVERTISSEMENT
Ne jamais tenter de redresser un axe
tordu.
Limite de déformation 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 unique-
ment)
Utiliser le comparateur 1.
Hors spécification → Exami-
ner le voile de roue.
Si le voile de la roue est nor-
mal, changer le disque de frein.
2. Mesurer:
Epaisseur de disque de frein a
Hors limite → Remplacer.
Limite de déflexion de dis-
que:
Arrière:
:0,15 mm
(0,006 in)
Limite d’usure de disque:
Avant:
3,0 mm (0,12 in)
: 2,5 mm
(0,10 in)
Arrière:
4,0 mm (0,16 in)
: 3,5 mm
(0,14 in)
Asse della ruota
1. Misurare:
Deformazioni asse della ruota
Fuori specifica → Regolare.
Utilizzare un comparatore 1.
NOTA:
Il valore di deformazione corrisponde
alla metà del valore indicato dal compa-
ratore.
AVVERTENZA
Non tentare di raddrizzare un asse
deformato.
Limite di deformazione
dell’asse della ruota:
0,5 mm (0,020 in)
Disco freno
1. Misurare:
Deflessione disco del freno
(solo disco del freno poste-
riore)
Utilizzare un comparatore 1.
Fuori specifica → Ispezionare
il disassamento della ruota.
Se il disassamento è in buone
condizioni, sostituire il disco
del freno.
2. Misurare:
Spessore del disco del freno a
Fuori limite → Sostituire.
Limite di deflessione del
disco freno:
Posteriore:
: 0,15 mm
(0,006 in)
Spessore del disco freno:
Anteriore:
3,0 mm (0,12 in)
: 2,5 mm
(0,10 in)
Posteriore:
4,0 mm (0,16 in)
: 3,5 mm
(0,14 in)

7 - 13
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:
140 mm (5.51 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.

7 - 21
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).