2001 YAMAHA YZ250F lock

5 - 32
CHAS
Front fork cap bolt
1. Inspect:
lFront fork cap bolt 1
lO-ring 2
lAir bleed screw 3
Wear/damage ® Replace.
FRONT FORK
EC555000
ASSEMBLY AND INSTALLATION
Front fork assembly
1. Wash the all parts in a clean solvent.
2. Install:
lDamper rod 1
To inner tube 2.
ACHTUNG:CAUTION:
To install the damper rod into the inner
tube, hold the inner tube aslant. If the inner
tube is held vertically, the damper rod may
fall into it, damaging the valve inside.
3. Install:
lCopper washer 1
lO-ring 2
lBase valve 3
To inner tube 4.
4. Tighten:
lBase valve 1
NOTE:
lUse a damper rod holder 2 to lock the
damper rod 3.
lApply the LOCTITE® on the base valve
thread.
Damper rod holder:
YM-1423/90890-01423
T R..55 Nm (5.5 m · kg, 40 ft · lb)

5 - 33
CHASFRONT FORK
5. Install:
lSpring guide 1
lLocknut 2
To damper rod 3.
NOTE:
lInstall the spring guide with its cut a facing
upward.
lWith its thread b facing upward, fully finger
tighten the locknut onto the damper rod.
6. Install:
lDust seal 1
lStopper ring 2
lOil seal 3
lOil seal washer 4
lSlide metal 5
To inner tube 6.
NOTE:
lApply the fork oil on the inner tube.
lWhen installing the oil seal, use vinyl seat a
with fork oil applied to protect the oil seal lip.
lInstall the oil seal with its manufacture’s
marks or number facing the axle holder side.
7. Install:
lPiston metal 1
NOTE:
Install the piston metal onto the slot on inner
tube.
8. Install:
lOuter tube 1
To inner tube 2.

5 - 37
CHASFRONT FORK
21. Measure:
lDistance a
Out of specification ® Turn into the
locknut.
Distance a:
20 mm (0.79 in) or more
Between damper rod 1 top and
locknut 2 top.
22. Loosen:
lRebound damping adjuster 1
NOTE:
lLoosen the rebound damping adjuster finger
tight.
lRecord the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
23. Install
lCushion rubber 1
lWasher 2
lSpacer 3
To front fork cap bolt 4.
NOTE:
Install the cushion rubber with its smaller
dia.end a facing the front fork cap bolt.
24. Install:
lPush rod 1
lFork spring 2
NOTE:
lInstall the fork spring with the damper rod 3
pulled up.
lAfter installing the fork spring, hold the
damper rod end so that it will not go down.
25. Install:
lFront fork cap bolt 1
Fully tighten the front fork cap bolt onto
the damper rod by hand.

5 - 38
CHASFRONT FORK
26. Tighten:
lFront fork cap bolt (locknut) 1
NOTE:
lWhile compressing the fork spring, set the
thin type spanners 2 between the spacer 3
and spring guide 4.
lHold the locknut 5 and tighten the front fork
cap bolt with specified torque.
27. Install:
lFront fork cap bolt 1
To outer tube.
NOTE:
Temporarily tighten the cap bolt.
T R..29 Nm (2.9 m · kg, 21 ft · lb)
28. Install:
lProtector guide 1
Installation
1. Install:
lFront fork 1
NOTE:
lTemporarily tighten the pinch bolts (lower
bracket).
lDo not tighten the pinch bolts (upper bracket)
yet.
2. Tighten:
lFront fork cap bolt 1
3. Adjust:
lFront fork top end a
Front fork top end (standard) a:
5 mm (0.20 in)
T R..30 Nm (3.0 m · kg, 22 ft · lb)

5 - 45
CHAS
LENKKOPF
Demontage-Arbeiten:1 Untere Gabelbrücke demontieren2 Lager demontieren
ANZUGSREIHENFOLGE:
lLenkerringmutter mit 38 Nm (3,8 m • kg) festziehen.lUm eine Umdrehung lockern.lNochmals mit 7 Nm (0,7 m • kg) festziehen.
Demontage-ArbeitenReihen-
folgeBauteil Anz. Bemerkungen
LENKKOPF DEMONTIEREN
WARNUNG
Das Motorrad gegen Umfallen sichern.Vorbereitung für den Ausbau Das Motorrad am Motor aufbocken
Nummernschild
Lenker
Kabelführung
Vorderrad-AbdeckungSiehe unter “LENKER”.
1 Lenkkopfmutter 1
2 Teleskopgabel 2 Siehe unter “TELESKOPGABEL”.
3 Obere Gabelbrücke 1
4 Lenkerringmutter 1 Spezialwerkzeug verwenden.
Siehe unter “AUSBAU”.
5 Untere Gabelbrücke 1
6 Lagerschutzkappe 1
7 Oberes Lager 1
8 Unteres Lager 1 Siehe unter “AUSBAU”.
9 Laufring 2 Siehe unter “AUSBAU”.
1
2
DIRECTION
LENKKOPF
STERZO
DIRECTION
Organisation de la dépose:1 Dépose du té inférieur2 Dépose du roulement
ETAPES DE SERRAGE:
lSerrer l’écrou crénelé de direction à un couple d’environ 38 Nm (3,8 m • kg, 27 ft • lb).lLe desserrer d’un tour.lLe resserrer à un couple d’environ 7 Nm (0,7 m • kg, 5,1 ft • lb)
Organisation de la dépose Ordre Nom de pièce Qté Remarques
DEPOSE DE LA DIRECTION
AVERTISSEMENT
Bien soutenir la machine afin qu’elle ne risquepas de se renverser.
Préparation pour la dépose Maintenir la machine en plaçant un support
approprié sous le moteur.
Plaque de numéro
Guidon
Guide de câble
Garde-boue avantSe reporter à la section “GUIDON”.
1 Ecrou de colonne de direction 1
2 Fourche avant 2 Se reporter à la section “FOURCHE AVANT”.
3 Té supérieur 1
4 Ecrou crénelé de direction 1 Utiliser l’outil spécial.
Se reporter à “POINTS DE DEPOSE”.
5 Té inférieur 1
6 Couvercle de cage à billes 1
7 Roulement supérieur 1
8 Roulement inférieur 1 Se reporter à “POINTS DE DEPOSE”.
9 Cage à billes 2 Se reporter à “POINTS DE DEPOSE”.
1
2
STERZO
Portata dello smontaggio:1 Rimozione della staffa inferiore 2 Rimozione del cuscinetto
OPERAZIONI DI SERRAGGIO:
lSerrare la ghiera. 38 Nm (3.8 m•kg, 27 ft•lb)
lAllentarla di un giro.
lRiserrarla. 7 Nm (0,7 m • kg, 5,1 ft • lb)
Portata dello smontaggio Ordine Denominazione Quantità Osservazioni
RIMOZIONE DELLO STERZO
AVVERTENZA
Sostenere saldamente il veicolo in modo che non ci siail rischio che si rovesci. Preparazione per la rimozione Mantenere il veicolo posizionando un supporto
idoneo sotto al motore.
Targa
Manubrio
Guidacavo
Parafango anterioreFare riferimento al paragrafo “MANUBRIO”.
1 Dado cannotto dello sterzo 1
2 Forcella anteriore 2Fare riferimento al paragrafo “FORCELLA ANTERIORE”.
3 Piastra superiore 1
4 Ghiera 1 Utilizzare l’utensile speciale.
Fare riferimento a “PUNTI DI RIMOZIONE”.
5 Piastra inferiore 1
6 Coperchio pista 1
7 Cuscinetto superiore 1
8 Cuscinetto inferiore 1 Fare riferimento a “PUNTI DI RIMOZIONE”.
9 Pista 2 Fare riferimento a “PUNTI DI RIMOZIONE”.
1
2

5 - 48
CHAS
4. Install:
lWasher 1
lSteering ring nut 2
Tighten the steering ring nut using the
steering nut wrench 3.
Refer to “STEERING HEAD INSPEC-
TION AND ADJUSTMENT” section in
the CHAPTER 3.
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
5. Check the steering stem by turning it lock
to lock. If there is any binding, remove
the steering stem assembly and inspect
the steering bearings.
6. Install:
lWasher 1
7. Install:
lFront fork 1
lUpper bracket 2
NOTE:
lTemporarily tighten the pinch bolts (lower
bracket).
lDo not tighten the pinch bolts (upper bracket)
yet.
8. Install:
lWasher 1
lSteering stem nut 2
T R..145 Nm (14.5 m · kg, 105 ft · lb)
STEERING

5 - 57
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
Extent of removal:1 Rear shock absorber removal2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
Preparation for removalREAR SHOCK ABSORBER
REMOVAL
Hold the machine by placing the
suitable stand under the engine.
WARNING
Support the machine securely so there is nodanger of it falling over.
Seat Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section.
Silencer Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Bolt (reservoir tank) 1
2 Clamp (air cleaner joint) 1 Only loosening.
3 Rear frame 1
4 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
5 Bolt (rear shock absorber-frame) 1
6 Rear shock absorber 1
7 Locknut 1 Only loosening.
8 Adjuster 1 Only loosening.
9 Lower spring guide 1
1
2

5 - 57
CHAS
AMORTISSEUR ARRIERE
FEDERBEIN
AMMORTIZZATORE POSTERIORE
FEDERBEIN
Demontage-Arbeiten:1 Federbein demontieren2 Federbein zerlegen
Demontage-ArbeitenReihen-
folgeBauteil Anz. Bemerkungen
Vorbereitung für den AusbauFEDERBEIN DEMONTIEREN
Das Motorrad am Motor aufbocken.
WARNUNG
Das Motorrad gegen Umfallen sichern.
Sitzbank Siehe Abschnitt “SITZBANK, KRAFTSTOFFTANK
UND SEITENABDECKUNGEN”.
Schalldämpfer Siehe Abschnitt “AUSPUFF UND SCHALLDÄMP-
FER” in KAPITEL 4.
1 Schraube (Bremsflüssigkeitsbehälter) 1
2 Schlauchschelle (Luftfilteranschluß) 1 Nur lockern.
3 Rahmenhinterteil 1
4 Schraube (Umlenkhebel, Federbein) 1 Die Schwinge festhalten.
5 Schraube (Federbein, Rahmen) 1
6 Federbein 1
7 Sicherungsmutter 1 Nur lockern.
8 Einstellmutter 1 Nur lockern.
9Unterer Federsitz
1
1
2
AMORTISSEUR ARRIERE
Organisation de la dépose:1 Dépose de l’amortisseur arrière2 Démontage de l’amortisseur arrière
Organisation de la dépose Ordre Nom de pièce Qté Remarques
Préparation pour la déposeDEPOSE DE L’AMORTISSEUR
ARRIERE
Maintenir la machine en plaçant un support
approprié sous le moteur.
AVERTISSEMENT
Bien soutenir la machine afin qu’elle ne risque
pas de se renverser.
Selle Se référer à la section “SELLE, RESERVOIR A
ESSENCE ET CACHES LATERAUX”.
Silencieux Se référer à la section “TUYAU D’ECHAPPEMENT ET
SILENCIEUX” du CHAPITRE 4.
1 Boulon (réservoir) 1
2 Bride (raccord de filtre à air) 1 Desserrer uniquement.
3 Cadre arrière 1
4 Boulon (amortisseur arrière-bras de relais) 1 Tenir le bras oscillant.
5 Boulon (amortisseur arrière-cadre) 1
6 Amortisseur arrière 1
7 Contre-écrou 1 Desserrer uniquement.
8 Dispositif de réglage 1 Desserrer uniquement.
9Guide de ressort inférieur
1
1
2
AMMORTIZZATORE POSTERIORE
Portata dello smontaggio:1 Rimozione ammortizzatore posteriore2 Smontaggio ammortizzatore posteriore
Portata dello smontaggio Ordine Denominazione Quantità Osservazioni
Preparazione per la rimozioneRIMOZIONE AMMORTIZZATORE
POSTERIORE
Mantenere il veicolo posizionando un supporto
idoneo sotto al motore.
AVVERTENZA
Sostenere saldamente il veicolo in modo che non ci siail rischio che si rovesci.
Sella Fare riferimento al paragrafo “SELLA, SERBATOIO
DEL CARBURANTE E CARENATURA LATERALE”.
Silenziatore Fare riferimento al paragrafo “TUBO DI SCARICO E
SILENZIATORE” nel CAPITOLO 4.
1 Bullone (serbatoio) 1
2 Morsetto (giunto filtro dell’aria) 1 Allentare soltanto.
3 Telaio posteriore 1
4 Bullone (ammortizzatore posteriore - leva di
rinvio)1 Sostenere il forcellone oscillante.
5 Bullone (ammortizzatore posteriore - telaio) 1
6 Ammortizzatore posteriore 1
7 Controdado 1 Allentare soltanto.
8 Registro 1 Allentare soltanto.
9 Guida molla inferiore 1
1
2