2007 YAMAHA YZ250F transmission

ENG
4 - 87
ZUSAMMENBAU UND MONTAGE
Motor montieren
1. Montieren:
Motor
1
Den Motor von der rechten
Seite montieren.
Schwingenachse
2
Motor-Lagerbolzen (unten)
3
Untere Motorhalterung
4
Schraube (untere Motorhalte-
rung)
5
Sicherungsring
6
Motor-Lagerbolzen (vorn)
7
Obere Motorhalterung
8
Schraube (obere Motorhalte-
rung)
9
Motor-Lagerbolzen (oben)
0
Motorschutz unten
A
Schraube (Motorschutz unten)
B
HINWEIS:
Molybdändisulfidöl auf die Schwin-
genachse auftragen.
Den Sicherungsring mit den
Klauen
a zur Außenseite des
Rahmens weisend montieren.
T R..85 Nm (8,5 m · kg, 61 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..38 Nm (3,8 m · kg, 27 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..34 Nm (3,4 m · kg, 25 ft · lb)
T R..55 Nm (5,5 m · kg, 40 ft · lb)
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
Fußbremshebel
1. Montieren:
Feder
1
Fußbremshebel
2
O-Ring
3
Fußbremshebel-Schraube
4
Clip
5
HINWEIS:
Die Schraube, O-Ringe und Fuß-
bremshebel-Halterung mit Lithium-
seifenfett bestreichen.
Antriebsritzel
1. Montieren:
Antriebsritzel
1
Antriebskette
2
HINWEIS:
Antriebsritzel und -kette gemeinsam
montieren.
T R..26 Nm (2,6 m · kg, 19 ft · lb)
ASSEMBLAGE ET MONTAGE
Montage du moteur
1. Monter:
Moteur 1
Monter le moteur par le côté
droit.
Boulon-pivot 2
Boulon d’ancrage du moteur
(inférieur) 3
Support de moteur inférieur 4
Boulon (support de moteur infé-
rieur) 5
Rondelle 6
Boulon d’ancrage du moteur
(avant) 7
Support de moteur supérieur 8
Boulon (support de moteur supé-
rieur) 9
Boulon d’ancrage du moteur
(supérieur) 0
Protège-carter inférieur A
Boulon (protège-carter inférieur)
B
N.B.:
Appliquer de la graisse au bisulfure de
molybdène sur le boulon-pivot.
Monter la rondelle en orientant la
griffe a vers l’extérieur du châssis.
T R..85 Nm (8,5 m · kg, 61 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..38 Nm (3,8 m · kg, 27 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..34 Nm (3,4 m · kg, 25 ft · lb)
T R..55 Nm (5,5 m · kg, 40 ft · lb)
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
Pédale de frein
1. Monter:
Ressort 1
Pédale de frein 2
Joint torique 3
Boulon (pédale de frein) 4
Clip 5
N.B.:
Appliquer de la graisse à savon de
lithium sur le boulon, les joints toriques
et le support de pédale de frein.
Couronne arrière
1. Monter:
Couronne arrière 1
Chaîne de transmission 2
N.B.:
Monter en même temps la couronne
arrière et la chaîne de transmission.
T R..26 Nm (2,6 m · kg, 19 ft · lb)
MONTAGGIO E INSTALLAZIONE
Installazione del motore
1. Installare:
Motore 1
Installare il motore dal lato
destro.
Albero di articolazione 2
Bullone di fissaggio motore (infe-
riore) 3
Staffa inferiore motore 4
Bullone (staffa inferiore motore)
5
Vite di rappezzo 6
Bullone di fissaggio motore
(anteriore) 7
Staffa superiore motore 8
Bullone (staffa superiore motore)
9
Bullone di fissaggio motore
(superiore) 0
Riparo inferiore motore A
Bullone (riparo inferiore motore)
B
NOTA:
Applicare il grasso al disolfuro di
molibdeno sull’albero di articolazione.
Installare la vite di rappezzo con la
griffa a rivolta verso l’esterno sulla
parte ciclistica.
T R..85 Nm (8,5 m · kg, 61 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..38 Nm (3,8 m · kg, 27 ft · lb)
T R..53 Nm (5,3 m · kg, 38 ft · lb)
T R..34 Nm (3,4 m · kg, 25 ft · lb)
T R..55 Nm (5,5 m · kg, 40 ft · lb)
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
Pedale del freno
1. Installare:
Molla 1
Pedale del freno 2
Guarnizione circolare 3
Bullone (pedale del freno) 4
Fermo 5
NOTA:
Applicare il grasso a base di sapone di
litio sul bullone, sulle guarnizioni circo-
lari e sulla staffa del pedale del freno.
Ruota dentata di trasmissione
1. Installare:
Ruota dentata di trasmissione 1
Catena di trasmissione 2
NOTA:
Installare la ruota dentata di trasmissione
con la catena di trasmissione.
T R..26 Nm (2,6 m · kg, 19 ft · lb)
DEPOSE DU MOTEUR
MOTOR DEMONTIEREN
RIMOZIONE DEL MOTORE

ENG
4 - 88
2. Montieren:
Sicherungsscheibe
1
Antriebsritzel-Mutter
2
HINWEIS:
Beim Festziehen der Mutter die Hin-
terradbremse betätigen.
T R..75 Nm (7,5 m · kg, 54 ft · lb)
3. Die Lasche der Sicherungs-
scheibe gegen die Mutter umbie-
gen.
4. Montieren:
Antriebsritzel
1
Antriebsritzel-Abdeckung
2
(Antriebsritzel-Abdeckung)
3
T R..8 Nm (0,8 m · kg, 5,8 ft · lb)
Leerlaufschalter und Schlauchfüh-
rung
1. Montieren:
Feder
1
Stift
2
O-Ring
3
Leerlaufschalter
4
Leerlaufschalter-Schraube
5
HINWEIS:
Den O-Ring mit Lithiumseifenfett
bestreichen.
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
2. Montieren:
Schlauchführung (Zylinder-
kopf-Entlüftungsschlauch)
1
Schraube (Schlauchführung)
2
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
2. Monter:
Rondelle-frein 1
Ecrou (couronne arrière) 2
N.B.:
Serrer l’écrou tout en actionnant le frein
arrière.
T R..75 Nm (7,5 m · kg, 54 ft · lb)
3. Plier l’onglet de la rondelle-frein
pour bloquer l’écrou.
4. Monter:
Patin de chaîne de transmission
1
Couvercle de pignon de chaîne de
transmission 2
Vis (couvercle de pignon de
chaîne de transmission) 3
T R..8 Nm (0,8 m · kg, 5,8 ft · lb)
Contacteur point mort et durit de
frein
1. Monter:
Ressort 1
Goupille 2
Joint torique 3
Contacteur de point mort 4
Vis (contacteur de point mort) 5
N.B.:
Appliquer de la graisse à savon de
lithium sur le joint torique.
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
2. Monter:
Guide de durit (durit de mise à
l’air de la culasse) 1
Boulon (guide de durit) 2
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
2. Installare:
Rondella di bloccaggio 1
Dado (ruota dentata di trasmis-
sione) 2
NOTA:
Serrare il dado azionando contemporane-
amente il freno posteriore.
T R..75 Nm (7,5 m · kg, 54 ft · lb)
3. Piegare la linguetta della rondella di
bloccaggio per bloccare il dado.
4. Installare:
Guida ruota dentata catena di tra-
smissione 1
Coperchio ruota dentata catena di
trasmissione 2
Vite (coperchio ruota dentata
catena di trasmissione) 3
T R..8 Nm (0,8 m · kg, 5,8 ft · lb)
Interruttore folle e guida flessibile
1. Installare:
Molla 1
Perno 2
Guarnizione circolare 3
Interruttore folle 4
Vite (interruttore folle) 5
NOTA:
Applicare il grasso a base di sapone di
litio sulla guarnizione circolare.
T R..4 Nm (0,4 m · kg, 2,9 ft · lb)
2. Installare:
Guida flessibile (flessibile di
sfiato testata) 1
Bullone (guida flessibile) 2
T R..10 Nm (1,0 m · kg, 7,2 ft · lb)
DEPOSE DU MOTEUR
MOTOR DEMONTIEREN
RIMOZIONE DEL MOTORE

4 - 91
ENGCRANKCASE AND CRANKSHAFT
CRANKCASE BEARING
Extent of removal:
1 Crankcase bearing removal
Extent of removal Order Part name Q’ty Remarks
CRANKCASE BEARING
REMOVAL
Preparation for removal Transmission Refer to “TRANSMISSION, SHIFT
CAM AND SHIFT FORK” section.
Shift cam and shift fork
1 Oil seal 2
2 Bearing 10 Refer to “REMOVAL POINTS”.
1

4 - 92
ENGCRANKCASE AND CRANKSHAFT
REMOVAL POINTS
Crankcase
1. Separate:
Right crankcase
Left crankcase
Separation steps:
Remove the crankcase bolts 1, hose
guide 2 and clutch cable holder 3.
NOTE:
Loosen each bolt 1/4 of a turn at a time and
after all the bolts are loosened, remove
them.
Remove the right crankcase 4.
NOTE:
Place the crankcase with its left half down-
ward and split the right half apart while lift-
ing it horizontally by lightly tapping the
projection a on it using a soft hammer.
When splitting it, leave the crankshaft and
transmission with the left half.
CAUTION:
Use soft hammer to tap on the case half.
Tap only on reinforced portions of case.
Do not tap on gasket mating surface.
Work slowly and carefully. Make sure the
case halves separate evenly. If the cases
do not separate, check for a remaining
case bolt or fitting. Do not force.
Remove the dowel pins and O-ring.
a
4

4 - 96
ENGCRANKCASE AND CRANKSHAFT
2. Check:
Shifter operation
Transmission operation
Unsmooth operation → Repair.
3. Install:
Oil strainer 1
Bolt (oil strainer) 2
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
4. Apply:
Sealant
On the right crankcase 1.
NOTE:
Clean the contacting surface of left and right
crankcase before applying the sealant.
5. Install:
Dowel pin 1
O-ring 2
Right crankcase
To left crankcase.
NOTE:
Fit the right crankcase onto the left crank-
case. Tap lightly on the case with soft ham-
mer.
When installing the crankcase, the connect-
ing rod should be positioned at TDC (top
dead center).
YAMAHA Bond No. 1215
(ThreeBond® No. 1215):
90890-85505

4 - 97
ENGCRANKCASE AND CRANKSHAFT
6. Tighten:
Hose guide 1
Clutch cable holder 2
Bolt (crankcase) 3
NOTE:
Tighten the crankcase tightening bolts in
stage, using a crisscross pattern.
T R..12 Nm (1.2 m · kg, 8.7 ft · lb)
7. Install:
Oil delivery pipe 2 1
O-ring 2
Bolt (oil delivery pipe 2) 3
NOTE:
Apply the lithium soap base grease on the O-
rings.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)
8. Install:
Timing chain 1
Timing chain guide (intake side) 2
Bolt (timing chain guide) 3
9. Remove:
Sealant
Forced out on the cylinder mating sur-
face.
10. Apply:
Engine oil
To the crank pin, bearing and oil delivery
hole.
11. Check:
Crankshaft and transmission operation.
Unsmooth operation → Repair.
T R..10 Nm (1.0 m · kg, 7.2 ft · lb)

4 - 98
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H0000
TRANSMISSION, SHIFT CAM AND SHIFT FORK
Extent of removal:
1 Shift fork, shift cam, main axle and drive axle removal
Extent of removal Order Part name Q’ty Remarks
TRANSMISSION, SHIFT CAM
AND SHIFT FORK REMOVAL
Preparation for removal Engine Refer to “ENGINE REMOVAL” section.
Separate the crankcase. Refer to “CRANKCASE AND CRANK-
SHAFT” section.
1 Main axle 1
Refer to “REMOVAL POINTS”. 2 Drive axle 1
3Shift cam 1
4 Shift fork 3 1
5 Shift fork 2 1
6 Shift fork 1 1
7 Collar 1
1

4 - 99
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H3000
REMOVAL POINTS
EC4H3230
Transmission
1. Remove:
Main axle 1
Drive axle 2
Shift cam
Shift fork 3
Shift fork 2
Shift fork 1
NOTE:
Remove assembly with the collar 3 installed
to the crankcase.
Remove assembly carefully. Note the posi-
tion of each part. Pay particular attention to
the location and direction of shift forks.
Remove the main axle, drive axle, shift cam
and shift fork all together by tapping lightly on
the transmission drive axle with a soft ham-
mer.
EC4H4000
INSPECTION
EC4H4200
Gears
1. Inspect:
Matching dog a
Gear teeth b
Shift fork groove c
Wear/damage → Replace.
2. Inspect:
O-ring 1
Damage → Replace.
3. Check:
Gears movement
Unsmooth movement → Repair or
replace.
EC4H4600
Bearing
1. Inspect:
Bearing 1
Rotate inner race with a finger.
Rough spot/seizure → Replace.