2004 YAMAHA YZ250F air filter

5 - 58
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.
WARNINGSupport the machine securely so there is nodanger of it falling over.
Seat and fitting band Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section in the CHAPTER 4.
Silencer Refer to “EXHAUST PIPE AND
SILENCER” section in the CHAPTER 4.
1 Clamp (air filter joint) 1 Only loosening.
2 Rear frame 1
3 Bolt (rear shock absorber-relay
arm)1 Hold the swingarm.
4 Bolt (rear shock absorber-frame) 1
5 Rear shock absorber 1
6 Locknut 1 Only loosening.
7 Adjuster 1 Only loosening.
8 Lower spring guide 1
1
2

5 - 58
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.
WARNUNGDas Motorrad gegen Umfallen sichern.
Sitz und Paßband Siehe Abschnitt “SITZBANK, KRAFTSTOFFTANK
UND SEITENABDECKUNGEN” in KAPITEL 4.
Schalldämpfer Siehe Abschnitt “KRÜMMER UND SCHALLDÄMP-
FER” in KAPITEL 4.
1 Schlauchschelle (Luftfilteranschluß) 1 Nur lockern.
2 Rahmenhinterteil 1
3 Schraube (Umlenkhebel, Federbein) 1 Die Schwinge festhalten.
4 Schraube (Federbein, Rahmen) 1
5 Federbein 1
6 Sicherungsmutter 1 Nur lockern.
7 Einstellmutter 1 Nur lockern.
8 Unterer 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 QtéRemarques
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 et ruban d’ajustement Se référer à la section “SELLE, RESERVOIR DE CAR-
BURANT ET CACHES LATERAUX” du CHAPITRE 4.
Silencieux Se référer à la section “TUYAU D’ECHAPPEMENT ET
SILENCIEUX” du CHAPITRE 4.
1 Bride (raccord de filtre à air) 1 Desserrer uniquement.
2 Cadre arrière 1
3 Boulon (amortisseur arrière-bras de relais) 1 Tenir le bras oscillant.
4 Boulon (amortisseur arrière-cadre) 1
5 Amortisseur arrière 1
6 Contre-écrou 1 Desserrer uniquement.
7 Dispositif de réglage 1 Desserrer uniquement.
8 Guide de ressort inférieur 1
1
2
AMMORTIZZATORE POSTERIORE
Portata dello smontaggio:1 Rimozione ammortizzatore posteriore2 Smontaggio ammortizzatore posteriore
Portata dello smontaggio Ordine Denominazione QuantitàOsservazioni
Preparazione per la rimozioneRIMOZIONE AMMORTIZZATORE
POSTERIORE
Mantenere il veicolo posizionando un supporto
idoneo sotto al motore.
AVVERTENZASostenere saldamente il veicolo in modo che non ci siail rischio che si rovesci.
Sella e fascia di regolazione Fare riferimento al paragrafo “SELLA, SERBATOIO
CARBURANTE E CARENATURA LATERALE” nel
CAPITOLO 4.
Silenziatore Fare riferimento al paragrafo “TUBO DI SCARICO E
SILENZIATORE” nel CAPITOLO 4.
1 Morsetto (giunto filtro dell’aria) 1 Allentare soltanto.
2 Telaio posteriore 1
3 Bullone (ammortizzatore posteriore - leva di
rinvio)1 Sostenere il forcellone oscillante.
4 Bullone (ammortizzatore posteriore - telaio) 1
5 Ammortizzatore posteriore 1
6 Controdado 1 Allentare soltanto.
7 Registro 1 Allentare soltanto.
8 Guida molla inferiore 1
1
2

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CHASREAR SHOCK ABSORBER
2. Install:
Bushing 1
Collar 2
Dust seal 3
NOTE:
Apply the molybdenum disulfide grease on
the bearing.
Apply the lithium soap base grease on the
bushing, collars and dust seals.
Install the dust seals with their lips facing
outward.
3. Install:
Rear shock absorber
4. Install:
Bolt (rear shock absorber-frame) 1
Nut (rear shock absorber-frame) 2
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
5. Install:
Bolt (rear shock absorber-relay arm) 1
Nut (rear shock absorber-relay arm) 2
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
T R..56 Nm (5.6 m · kg, 40 ft · lb)
T R..53 Nm (5.3 m · kg, 38 ft · lb)
6. Install:
Rear frame 1
Bolt [rear frame (upper)] 2
Bolt [rear frame (lower)] 3
T R..32 Nm (3.2 m · kg, 23 ft · lb)
T R..29 Nm (2.9 m · kg, 21 ft · lb)
7. Tighten:
Screw (air filter joint) 1
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)

5 - 64
CHAS
2. Montieren:
Buchse 1
Hülse 2
Staubschutzring 3
HINWEIS:
Molybdändisulfidfett auf das Lager
auftragen.
Lithiumfett auf die Buchse, Muffe
und die Staubdichtungen auftragen.
Die Staubdichtungen so einbauen,
daß die Dichtlippen nach außen
weisen.
3. Montieren:
Federbein
4. Montieren
Schraube (Federbein, Rah-
men) 1
Mutter (Federbein, Rahmen)
2
HINWEIS:
Molybdändisulfidfett auf die Schrau-
be auftragen.
T R..56 Nm (5,6 m · kg, 40 ft · lb)
5. Montieren:
Schraube (Umlenkhebel,
Federbein) 1
Mutter (Umlenkhbel, Feder-
bein) 2
HINWEIS:
Molybdändisulfidfett auf die Schrau-
be auftragen.
T R..53 Nm (5,3 m · kg, 38 ft · lb)
6. Montieren:
Rahmen-Hinterteil 1
Schraube [Rahmen-Hinter-
teil (oben)] 2
Schraube [Rahmen-Hinter-
teil (unten)] 3
T R..32 Nm (3,2 m · kg, 23 ft · lb)
T R..29 Nm (2,9 m · kg, 21 ft · lb)
7. Festziehen:
Schraube (Luftfilteran-
schluß) 1
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
2. Monter:
Douille 1
Collerette 2
Joint antipoussière 3
N.B.:
Enduire le roulement de graisse au
bisulfure de molybdène.
Enduire les douilles, les collerettes et
les joints antipoussière de graisse à
base de savon au lithium.
Monter les joints antipoussière en diri-
geant leurs lèvres vers l’extérieur.
3. Monter:
Amortisseur arrière
4. Monter:
Boulon (amortisseur arrière-
cadre) 1
Ecrou (amortisseur arrière-
cadre) 2
N.B.:
Appliquer de la graisse de molybdène
sur le boulon.
T R..56 Nm (5,6 m · kg, 40 ft · lb)
5. Monter:
Boulon (amortisseur arrière-
bras de relais) 1
Ecrou (amortisseur arrière-bras
de relais) 2
N.B.:
Appliquer de la graisse de molybdène
sur le boulon.
T R..53 Nm (5,3 m · kg, 38 ft · lb)
6. Monter:
Cadre arrière 1
Boulon [cadre arrière (haut)] 2
Boulon [cadre arrière (bas)] 3
T R..32 Nm (3,2 m · kg, 23 ft · lb)
T R..29 Nm (2,9 m · kg, 21 ft · lb)
7. Serrer:
Vis (raccord de filtre à air) 1
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
2. Installare:
Boccola 1
Collarino 2
Guarnizione parapolvere 3
NOTA:
Applicare grasso al disolfuro di molib-
deno sul cuscinetto.
Applicare grasso a base di sapone di
litio sulle boccole, sui collarini e sui
parapolvere.
Installare i parapolvere con il labbro
rivolto in avanti.
3. Installare:
Ammortizzatore posteriore
4. Installare:
Bullone (ammortizzatore
posteriore - telaio) 1
Dado (ammortizzatore poste-
riore - telaio) 2
NOTA:
Applicare grasso al disolfuro di molib-
deno sul bullone.
T R..56 Nm (5,6 m · kg, 40 ft · lb)
5. Installare:
Bullone (ammortizzatore
posteriore - leva di rinvio) 1
Dado (ammortizzatore poste-
riore - leva di rinvio) 2
NOTA:
Applicare grasso al disolfuro di molib-
deno sul bullone.
T R..53 Nm (5,3 m · kg, 38 ft · lb)
6. Installare:
Telaio posteriore 1
Bullone [telaio posteriore
(superiore)] 2
Bullone [telaio posteriore (infe-
riore)] 3
T R..32 Nm (3,2 m · kg, 23 ft · lb)
T R..29 Nm (2,9 m · kg, 21 ft · lb)
7. Serrare:
Vite (giunto filtro dell’aria) 1
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
AMORTISSEUR ARRIERE
FEDERBEIN
AMMORTIZZATORE POSTERIORE

7 - 10
TUN
Examples of carburetor setting depending on symptom
This should be taken simply for an example. It is necessary to set the carburetor while checking
the operating conditions of the engine.
Symptom Setting Checking
At full throttle
Hard breathing
Shearing noise
Whitish spark plug
Lean mixtureIncrease main jet calibration no.
(Gradually)Discoloration of spark plug →
If tan color, it is in good condition.
If cannot be corrected:
Clogged float valve seat
Clogged fuel hose
Clogged fuel cock
Check that the accelerator pump oper-
ates smoothly.
At full throttle
Speed pick-up stops
Slow speed pick-up
Slow response
Sooty spark plug
Rich mixtureDecrease main jet calibration no.
(Gradually)Discoloration of spark plug →
If tan color, it is in good condition.
If cannot be corrected:
Clogged air filter
Fuel overflow from carburetor
Lean mixture Lower jet needle clip position.
(1 groove down)
The clip position is the jet needle
groove on which the clip is installed.
The positions are numbered from the
top.
Check that the accelerator pump oper-
ates smoothly. (except for rich mixture
symptom). Rich mixture Raise jet needle clip position.
(1 groove up)
1/4 ~ 3/4 throttle
Hard breathing
Lack of speedLower jet needle clip position.
(1 groove down)
1/4 ~ 1/2 throttle
Slow speed pick-up
Poor accelerationRaise jet needle clip position.
(1 groove up)
Closed to 1/4 throttle
Hard breathing
Speed downUse jet needle with a smaller diameter. Slow-speed-circuit passage
Clogged → Clean.
Overflow from carburetor
Closed to 1/4 throttle
Poor accelerationUse jet needle with a larger diameter.
Raise jet needle clip position. (1 groove
up)
Poor response in the low to
intermediate speedsRaise jet needle clip position.
If this has no effect, lower the jet needle
clip position.
Poor response when throttle
is opened quicklyCheck overall settings.
Use main jet with a lower calibration no.
Raise jet needle clip position.
(1 groove up)
If these have no effect, use a main jet
with a higher calibration no. and lower
the jet needle clip position.Check air filter for fouling.
Check that the accelerator pump oper-
ates smoothly.
Jet needleClip
Groobe 7 Groobe 6
Groobe 5
Groobe 4
Groobe 3
Groobe 2
Groobe 1
Leaner
↑
(Standard)
↓
Richer
*
SETTING