2007 YAMAHA YZ250F air filter

ENG
4 - 64
AUSGLEICHSWELLE
Arbeitsumfang:
1 Ausgleichswellen-Antriebsritzel
2 Ausgleichswelle
ArbeitsumfangReihen-
folgeBauteil Anz. Bemerkungen
AUSGLEICHSWELLE DEMONTIEREN
Vorbereitungsarbeiten Primärantriebsrad Siehe unter “KUPPLUNG”.
Kurbelgehäusedeckel rechts Siehe unter “ÖLFILTER, WASSERPUMPE UND
KURBELGEHÄUSEDECKEL RECHTS”.
Stator Siehe unter “LICHTMASCHINE”.
1 Mutter (Primärantriebsritzel) 1
Siehe unter “DEMONTAGE-EINZELHEITEN”.
2 Mutter (Ausgleichswellen-Antriebsrad) 1
3 Sicherungsscheibe 1
4Primärantriebsritzel 1
5 Ausgleichswellen-Antriebsritzel 1
6 Sicherungsscheibe 1
7 Ausgleichswellen-Antriebsrad 1
8 Ausgleichswelle 1 Siehe unter “DEMONTAGE-EINZELHEITEN”.
1
2
2
BALANCIER
Organisation de la dépose:1 Pignon menant d’arbre de balancier2 Arbre de balancier
Organisation de la dépose Ordre Nom de la pièce QtéRemarques
DEPOSE DU BALANCIER
Préparation à la dépose Pignon mené de transmission primaire Se reporter à la section “EMBRAYAGE”.
Couvercle de carter droit Se reporter à la section “ELEMENT DE FILTRE A
HUILE, POMPE A EAU ET COUVERCLE DE CAR-
TER DROIT”.
Stator Se reporter à la section “VOLANT MAGNETIQUE CDI”.
1 Ecrou (pignon menant de transmission pri-
maire)1
Se reporter à “POINTS DE DEPOSE”.
2 Ecrou (pignon mené de l’arbre de balancier) 1
3 Rondelle-frein 1
4 Pignon menant de transmission primaire 1
5 Pignon menant de l’arbre de balancier 1
6 Rondelle-frein 1
7 Pignon mené de l’arbre de balancier 1
8 Arbre de balancier 1 Se reporter à “POINTS DE DEPOSE”.
12
2
EQUILIBRATORE
Estensione della rimozione:1 Ingranaggio conduttore dell’albero equilibratore2 Albero equilibratore
Estensione della rimozione Ordine Denominazione QuantitàOsservazioni
RIMOZIONE DELL’EQUILIBRATORE
Preparazione per la rimozione Ingranaggio condotto della trasmissione primaria Fare riferimento al paragrafo “FRIZIONE”.
Coperchio carter destro Fare riferimento al paragrafo “ELEMENTO FILTRO
OLIO, POMPA DELL’ACQUA E COPERCHIO CAR-
TER DESTRO”.
Statore Fare riferimento al paragrafo “MAGNETE CDI”.
1 Dado (ingranaggio conduttore della trasmis-
sione primaria)1
Fare riferimento a “PUNTI DI RIMOZIONE”.
2 Dado (ingranaggio condotto dell’albero equili-
bratore)1
3 Rondella di bloccaggio 1
4 Ingranaggio conduttore della trasmissione pri-
maria1
5 Ingranaggio conduttore dell’albero equilibratore 1
6 Rondella di bloccaggio 1
7 Ingranaggio condotto dell’albero equilibratore 1
8 Albero equilibratore 1 Fare riferimento a “PUNTI DI RIMOZIONE”.
1
2
2
BALANCIER
AUSGLEICHSWELLE
EQUILIBRATORE

ENG
4 - 67
ÖLPUMPE
Arbeitsumfang:
1 Ölpumpe demontieren
2 Ölpumpe zerlegen
ArbeitsumfangReihen-
folgeBauteil Anz. Bemerkungen
ÖLPUMPE DEMONTIEREN UND ZERLE-
GEN
Vorbereitungsarbeiten Primärantriebsrad Siehe unter “KUPPLUNG”.
Kurbelgehäusedeckel rechts Siehe unter “ÖLFILTER, WASSERPUMPE UND
KURBELGEHÄUSEDECKEL RECHTS”.
1 Sicherungsring 1
2 Beilagscheibe 1
3Ölpumpen-Antriebsritzel 1
4Ölpumpe 1
5Außenrotor 2 1
6 Sicherungsring 1
7 Innenrotor 2 1
8 Passhülse 1
9Ölpumpendeckel 1
10 Außenrotor 1 1
11 Innenrotor 1 1
1
2
POMPE A HUILE
Organisation de la dépose:1 Dépose de la pompe à huile2 Démontage de la pompe à huile
Organisation de la dépose Ordre Nom de la pièce QtéRemarques
DEPOSE ET DEMONTAGE DE LA
POMPE A HUILE
Préparation à la dépose Pignon mené de transmission primaire Se reporter à la section “EMBRAYAGE”.
Couvercle de carter droit Se reporter à la section “ELEMENT DE FILTRE A
HUILE, POMPE A EAU ET COUVERCLE DE CAR-
TER DROIT”.
1 Circlip 1
2 Rondelle 1
3 Pignon menant de pompe à huile 1
4 Pompe à huile complète 1
5 Rotor externe 2 1
6 Circlip 1
7 Rotor interne 2 1
8Goujon 1
9 Couvercle de pompe à huile 1
10 Rotor externe 1 1
11 Rotor interne 1 1
1
2
POMPA DELL’OLIO
Estensione della rimozione:1 Rimozione della pompa dell’olio2 Disassemblaggio della pompa dell’olio
Estensione della rimozione Ordine Denominazione QuantitàOsservazioni
RIMOZIONE E DISASSEMBLAGGIO
DELLA POMPA DELL’OLIO
Preparazione per la rimozione Ingranaggio condotto della trasmissione prima-
riaFare riferimento al paragrafo “FRIZIONE”.
Coperchio carter destro Fare riferimento al paragrafo “ELEMENTO FILTRO
OLIO, POMPA DELL’ACQUA E COPERCHIO CAR-
TER DESTRO”.
1 Anello elastico di sicurezza 1
2 Rondella 1
3 Ingranaggio conduttore della pompa olio 1
4 Gruppo pompa dell’olio 1
5 Rotore esterno 2 1
6 Anello elastico di sicurezza 1
7 Rotore interno 2 1
8 Grano di centraggio 1
9 Coperchio pompa dell’olio 1
10 Rotore esterno 1 1
11 Rotore interno 1 1
1
2
POMPE A HUILE
ÖLPUMPE
POMPA DELL’OLIO

5 - 62
CHASREAR SHOCK ABSORBER
EC580000
REAR SHOCK ABSORBER
Extent of removal:
1 Rear shock absorber removal
2 Rear shock absorber disassembly
Extent of removal Order Part name Q’ty Remarks
REAR SHOCK ABSORBER
REMOVAL
WARNING
Support the machine securely so
there is no danger of it falling over. Preparation for removal Hold the machine by placing the
suitable stand under the engine.
Seat 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.
2Rear 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 Spring seat 2
9 Lower spring guide 1
1
2

5 - 68
CHASREAR SHOCK ABSORBER
2. Install:
•Bushing 1
•Collar 2
•Dust seal 3
NOTE:
•Apply the molybdenum disulfide grease on
the bearing and dust seal lips.
•Install the dust seals with their lips facing out-
ward.
3. Install:
•Rear shock absorber
4. Install:
•Bolt (rear shock absorber-frame) 1
•Washer 2
•Nut (rear shock absorber-frame) 3
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.
1 2
3
M
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) 2
T R..32 Nm (3.2 m · kg, 23 ft · lb)
7. Tighten:
•Bolt (air filter joint) 1
1
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)

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 diame-
ter.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 nee-
dle 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
Groove 7 Groove 6
Groove 5
Groove 4
Groove 3
Groove 2
Groove 1
Leaner
↑
(Standard)
↓
Richer
*
SETTING