oil YAMAHA YZ250F 2001 Notices Demploi (in French)

INSP
ADJ
CONTROLE DE PRESSION DES PNEUS/CONTROLE ET SERRAGE DES RAYONS/
CONTROLE DE LA ROUE
REIFENLUFTDRUCK KONTROLLIEREN/SPEICHEN KONTROLLIEREN UND
FESTZIEHEN/RÄDER KONTROLLIEREN
CONTROLLO DELLA PRESSIONE DEI PNEUMATICI/ISPEZIONE E SERRAGGIO DEI
RAGGI/ISPEZIONE DELLE RUOTE
REIFENLUFTDRUCK KONTROL-
LIEREN
1. Messen:
lReifenluftdruck
Unvorschriftsmäßig ® Ein-
stellen.
HINWEIS:
lDen Reifenluftdruck bei kalten Rei-
fen kontrollieren.
lBei zu niedrigem Reifendruck liegt
die Reifenwulst nicht fest an, was
dazu führen kann, daß sich der
Reifen von der Felge löst.
lEin geneigter Reifenventilschaft
deutet an, daß der Reifen ver-
rutscht ist.
lBei geneigtem Reifenventilschaft
muß die Reifenposition berichtigt
werden.
Standard-Reifenluft-
druck
100 kPa (1,0 bar)
SPEICHEN KONTROLLIEREN
UND FESTZIEHEN
1. Kontrollieren:
lSpeichen 1
Verzug/Beschädigung ®
Erneuern.
Speichen locker ® Nach-
spannen.
2. Festziehen:
lSpeichen
HINWEIS:
Die Speichen müssen vor und nach
dem Einfahren nachgezogen wer-
den. Nach jeder Übungsfahrt bzw.
Rennen die Speichenspannung prü-
fen.
T R..3 Nm (0.3 m · kg)
RÄDER KONTROLLIEREN
1. Messen:
lFelgenschlag
Das Rad anheben und dre-
hen.
Übermäßig ® Erneuern. CONTROLE DE PRESSION DES
PNEUS
1. Mesurer:
lPression des pneus
Hors spécification ® Régler.
N.B.:
lVérifier le pneu alors qu’il est froid.
lDes butées de bourrelet lâches permet-
tent au pneu de se détacher de sa posi-
tion sur la jante lorsque la pression des
pneus est basse.
lUne tige de soupape de pneu inclinée
indique que le pneu se détache de sa
position sur la jante.
lSi la tige de soupape de pneu est incli-
née, le pneu a tendance à se détacher
de sa position. Corriger la position du
pneu.
Pression des pneus stan-
dard:
100 kPa
(1,0 kg/cm
2, 15 psi)
CONTROLE ET SERRAGE DES
RAYONS
1. Contrôler:
lRayons 1
Déformation/endommagement
® Remplacer.
Rayons desserrés ® Resserrer.
2. Serrer:
lRayon
N.B.:
Ne pas oublier de retendre les rayons
avant et après le rodage. Après un entraî-
nement ou une course, contrôler si les
rayons ne sont pas détendus.
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
CONTROLE DE LA ROUE
1. Mesure:
lVoile de roue
Soulever la roue et la tourner.
Voile excessif ® Remplacer.CONTROLLO DELLA PRESSIONE
DEI PNEUMATICI
1. Misurare:
lPressione dei pneumatici
Fuori specifica ® Regolare.
NOTA:
lControllare i pneumatici a freddo.
lI fermi del tallone consentono alla
ruota di scivolare dalla sua posizione
sul cerchio quando la pressione dei
pneumatici è bassa.
lUno stelo della valvola inclinato
indica che il pneumatico scivola dalla
sua posizione sul cerchione.
lSe lo stelo della valvola è inclinato,
indica che il pneumatico ha la ten-
denza a scivolare fuori posizione. Cor-
reggere la posizione dei pneumatici.
Pressione standard pneu-
matici:
100 kPa
(1,0 kg/cm
2, 15 psi)
ISPEZIONE E SERRAGGIO DEI
RAGGI
1. Ispezionare:
lRaggi 1
Deformazione/danno ® Sosti-
tuire.
Raggi allentati ® Serrare.
2. Serrare:
lRaggi
NOTA:
Accertarsi di serrare i raggi prima e dopo
il rodaggio. Dopo un allenamento o una
gara controllare l’eventuale allentamento
dei raggi.
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
ISPEZIONE DELLE RUOTE
1. Ispezionare:
lScentratura
Sollevare la ruota e farla girare.
Scentratura anomala ® Sosti-
tuirla.
3 - 42

3 - 45
INSP
ADJ
LUBRICATION
LUBRICATION
To ensure smooth operation of all compo-
nents, lubricate your machine during setup,
after break-in, and after every race.
1All control cable
2Clutch lever pivot
3Shift pedal pivot
4Footrest pivot
5Throttle-to-handlebar contact
6Drive chain
7Tube guide cable winding portion
8Throttle cable end
9Clutch cable end
0Decompression cable endUse Yamaha cable lube or equivalent on these
areas.
õUse SAE 10W-30 motor oil or suitable chain
lubricants.
‚Lubricate the following areas with high quality,
lightweight lithium-soap base grease.
CAUTION:
Wipe off any excess grease, and avoid get-
ting grease on the brake discs.
AAA
AAB
CC

4 - 19
ENGCAMSHAFTS
CAMSHAFTS
CYLINDER HEAD COVER
Extent of removal:1 Cylinder head cover removal
Extent of removal Order Part name Q’ty Remarks
CYLINDER HEAD COVER
REMOVAL
Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section.
Carburetor Refer to “CARBURETOR” section.
1 Spark plug 1
2 Cylinder head breather hose 1
3 Oil tank breather hose 1
4 Bolt (cylinder head cover) 2
5 Cylinder head cover 1
6 Cylinder head cover gasket 1
7Timing chain guide (top side)
1
1

4 - 25
ENGCAMSHAFTS
CAUTION:
Do not turn the crankshaft during the
camshaft installation. Damage or
improper valve timing will result.
lInstall the clips, camshaft caps 4 and
bolts (camshaft cap) 5.
T R..
Bolt (camshaft cap):
10 Nm (1.0 m • kg, 7.2 ft • lb)
NOTE:
lBefore removing the clips, cover the cylin-
der head with a clean rag to prevent the
clips from into the cylinder head cavity.
lApply the engine oil on the thread and con-
tact surface of the bolts (camshaft cap).
lTighten the bolts (camshaft cap) 5 in a
crisscross pattern.
CAUTION:
The bolts (camshaft cap) must be tight-
ened evenly or damage to the cylinder
head, camshaft caps and camshaft will
result.
2. Install:
lTiming chain tensioner
Installation steps:
lWhile pressing the tensioner rod lightly
with fingers, use a thin screwdriver and
wind the tensioner rod up fully clockwise.
lWith the rod fully wound and the chain
tensioner UP mark a facing upward,
install the gasket 1 and the timing chain
tensioner 2, and tighten the bolt 3 to the
specified torque.
T R..
Bolt (timing chain tensioner):
10 Nm (1.0 m • kg, 7.2 ft • lb)

4 - 27
ENG
7. Install:
lOil tank breather hose
lCylinder head breather hose
lSpark plug
T R..13 Nm (1.3 m · kg, 9.4 ft · lb)
CAMSHAFTS

4 - 28
ENGCYLINDER HEAD
CYLINDER HEAD
Extent of removal:1 Cylinder head removal
Extent of removal Order Part name Q’ty Remarks
CYLINDER HEAD REMOVAL
Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE
COVERS” section.
Exhaust pipe and silencer Refer to “EXHAUST PIPE AND
SILENCER” section.
Radiator hose 1 Disconnect at cylinder head side.
Carburetor Refer to “CARBURETOR” section.
Camshaft Refer to “CAMSHAFTS” section.
Upper engine bracket Refer to “ENGINE REMOVAL” section.
1 Radiator pipe 1
2 Decompression cable guide 1
3 Oil delivery pipe 1
4 Nut 2
5 Bolt [L=135 mm (5.31 in)] 2
6 Bolt [L=145 mm (5.71 in)] 2
7 Cylinder head 1 Disconnect the decompression cable.
8 Timing chain guard (exhaust side) 1
9 Bolt (decompression shaft) 1
10 Decompression shaft 1
1

ENG
4 - 29
CULASSE
ZYLINDERKOPF
TESTATA DEL CILINDRO
PRÜFUNG
Zylinderkopf
1. Entfernen:
lÖlkohleablagerungen (im
Brennraum)
Einen abgerundeten Scha-
ber verwenden.
HINWEIS:
Keine scharfkantigen Gegenstände
benutzen, um Beschädigungen und
Kratzer an folgenden Stellen zu ver-
meiden:
lZündkerzenbohrung
lVentilsitze
2. Kontrollieren:
lZylinderkopf
Kratzer/Beschädigungen ®
Erneuern.
3. Messen:
lZylinderkopf-Verzug
Grenzwert überschritten ®
Planschleifen.
Zylinderkopf-Verzugs-
grenze
unter 0,05 mm
Arbeitsschritte
lLineal und Fühlerlehre über den
Zylinderkopf legen.
lVerzug mit der Fühlerlehre
messen.
lIst die Verzugsgrenze über-
schritten, den Zylinderkopf
planschleifen.
lDen Zylinderkopf mit Naßschleif-
papier (Körnung 400–600) auf ei-
ner planen Platte in einer Achter-
bewegung abschleifen.
HINWEIS:
Den Zylinderkopf mehrmals dre-
hen, um eine ebene Oberfläche
zu gewährleisten.
CONTROLE
Culasse
1. Eliminer:
lDépôt de calamine
(de la chambre de combustion)
Utiliser un grattoir arrondi.
N.B.:
Ne pas utiliser d’instrument pointu pour
éviter d’endommager ou de rayer:
lFilets de bougies
lSièges de soupape
2. Contrôler:
lCulasse
Rayures/endommagement ®
Remplacer.
3. Mesurer:
lDéformation de la culasse
Hors spécifications ® Surfa-
cer.
Limite de déformation de
la culasse:
Moins de 0,05 mm
(0,002 in)
Etapes de la mesure de la limite de
déformation et du surfaçage:
lPlacer une règle et une jauge
d’épaisseur sur la culasse.
lUtiliser une jauge d’épaisseur pour
mesurer la déformation.
lSi la déformation est hors spécifi-
cations, surfacer la culasse.
lMettre un morceau de toile émeri
n˚ 400 à 600 humide sur une pla-
que à surfacer et surfacer la culasse
en décrivant des “huit”.
N.B.:
Tourner la culasse plusieurs fois pour
obtenir une surface lisse.
ISPEZIONE
Testata del cilindro
1. Eliminare:
lDepositi carboniosi (dalle
camere di combustione)
Utilizzare un raschietto arro-
tondato.
NOTA:
Non utilizzare uno strumento appuntito
per evitare di danneggiare o di graffiare:
lFilettature candela di accensione
lSedi delle valvole
2. Ispezionare:
lTestata del cilindro
Graffi/danno ® Sostituire.
3. Misurare:
lDeformazione testata del cilin-
dro
Fuori specifica ® Spianare.
Deformazione della testata
del cilindro:
Meno di 0,05 mm
(0,002 in)
Misurazione della deformazione e
fasi per lo spianamento:
lPosizionare un guardapiano ed uno
spessimetro sulla testata del cilin-
dro.
lUtilizzare uno spessimetro per
misurare la deformazione.
lSe la deformazione è fuori speci-
fica, spianare la testata del cilindro.
lPosizionare carta vetrata di grana
400 ~ 600 umida su un piano di
riscontro e spianare la testata con
un movimento a otto.
NOTA:
Per ottenere una superficie uniforme,
ruotare la testata del cilindro diverse
volte.

4 - 30
ENGCYLINDER HEAD
ASSEMBLY AND INSTALLATION
Cylinder head
1. Install:
lDecompression shaft 1
lCopper washer 2
lBolt (decompression shaft) 3
NOTE:
Apply the engine oil on the decompression
shaft.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
2. Install:
lDowel pin 1
lCylinder head gasket 2
lTiming chain guide (exhaust side) 3
lDecompression cable 4
lCylinder head 5
NOTE:
lInstall the decompression cable to the cylin-
der head, and then to the cylinder.
lWhile pulling up the timing chain, install the
timing chain guide (exhaust side) and cylin-
der head.

4 - 31
ENG
3. Install:
lWasher 1
lCable guide 2
lBolts [L=145 mm (5.71 in)] 3
lBolts [L=135 mm (5.31 in)] 4
lNuts 5
NOTE:
lApply the molybdenum disulfide grease on
the thread and contact surface of the bolts.
lFollow the numerical order shown in the illus-
tration. Tighten the bolts and nuts in two
stages.
T R..38 Nm (3.8 m · kg, 27 ft · lb)
T R..38 Nm (3.8 m · kg, 27 ft · lb)
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
4. Install:
lCopper washer 1
lOil delivery pipe 2
lUnion bolt (M8) 3
lUnion bolt (M10) 4
T R..18 Nm (1.8 m · kg, 13 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
5. Install:
lDecompression cable guide 1
lBolt (decompression cable guide) 2
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
6. Install:
lRadiator pipe 1
lBolt (radiator pipe) 2
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
CYLINDER HEAD

4 - 36
ENGVALVES AND VALVE SPRINGS
5. Measure:
lRunout (valve stem)
Out of specification ® Replace.
NOTE:
lWhen installing a new valve always replace
the guide.
lIf the valve is removed or replaced always
replace the oil seal.
6. Eliminate:
lCarbon deposits
(from the valve face and valve seat)
7. Inspect:
lValve seat
Pitting/wear ® Reface the valve seat.
Runout limit:
0.01 mm (0.0004 in)
8. Measure:
lValve seat width a
Out of specification ® Reface the valve
seat.
Valve seat width:
Intake:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
: 1.6 mm (0.0630 in)
Exhaust:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
: 1.6 mm (0.0630 in)
Measurement steps:
lApply Mechanic’s blueing dye (Dykem) b
to the valve face.
lInstall the valve into the cylinder head.
lPress the valve through the valve guide
and onto the valve seat to make a clear
pattern.
lMeasure the valve seat width. Where the
valve seat and valve face made contact,
blueing will have been removed.
lIf the valve seat is too wide, too narrow, or
the seat is not centered, the valve seat
must be refaced.