2007 YAMAHA YZ250F transmission oil

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 - 100
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4810
Shift fork, shift cam and segment
1. Inspect:
Shift fork 1
Wear/damage/scratches → Replace.
2. Inspect:
Shift cam 1
Segment 2
Wear/damage → Replace.
3. Check:
Shift fork movement
Unsmooth operation → Replace shift
fork.
NOTE:
For a malfunctioning shift fork, replace not only
the shift fork itself but the two gears each adja-
cent to the shift fork.
EC4H5000
ASSEMBLY AND INSTALLATION
Transmission
1. Install:
5th pinion gear (24T) 1
3rd pinion gear (20T) 2
Collar 3
4th pinion gear (22T) 4
2nd pinion gear (16T) 5
To main axle 6.
NOTE:
Apply the molybdenum disulfide oil on the
inner and end surface of the idler gear and on
the inner surface of the sliding gear, then
install.

4 - 101
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
2. Install:
2nd wheel gear (28T) 1
4th wheel gear (27T) 2
3rd wheel gear (29T) 3
5th wheel gear (25T) 4
1st wheel gear (30T) 5
O-ring 6
To drive axle 7.
NOTE:
Apply the molybdenum disulfide oil on the
inner and end surface of the idler gear and
on the inner surface of the sliding gear, then
install.
Apply the lithium soap base grease on the O-
ring.
3. Install:
Washer 1
Circlip 2
NOTE:
Be sure the circlip sharp-edged corner a is
positioned opposite side to the washer and
gear b.
Install the circlip with its ends c settled
evenly on the spline crests.
cc
4. Install:
Collar 1
NOTE:
Apply the lithium soap base grease on the oil
seal lip.
When installing the collar into the crankcase,
pay careful attention to the crankcase oil seal
lip.

4 - 102
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
5. Install:
Shift fork 1 (L) 1
Shift fork 2 (C) 2
Shift fork 3 (R) 3
Shift cam 4
To main axle and drive axle.
NOTE:
Apply the molybdenum disulfide oil on the
shift fork grooves.
Mesh the shift fork #1 (L) with the 4th wheel
gear 5 and #3 (R) with the 5th wheel gear 7
on the drive axle.
Mesh the shift fork #2 (C) with the 3rd pinion
gear 6 on the main axle.
6. Install:
Transmission assembly 1
To left crankcase 2.
NOTE:
Apply the engine oil on the bearings and guide
bars.
7. Check:
Shifter operation
Transmission operation
Unsmooth operation → Repair.

5 - 3
CHAS
DEMONTAGE-EINZELHEITEN
Hinterrad
1. Demontieren:
Rad
1
HINWEIS:
Das Hinterrad nach vorn drücken
und die Antriebskette
2 abnehmen.
Radlager (nach Bedarf)
1. Demontieren:
Lager
1
HINWEIS:
Das Lager mit einem Lageraustreiber
2 ausbauen.
KONTROLLE
Rad
1. Messen:
Felgenschlag
Nicht nach Vorgabe
→ Instand
setzen/erneuern.
Max. Felgenschlag:
Höhenschlag 1:
2,0 mm (0,08 in)
Seitenschlag 2:
2,0 mm (0,08 in)
2. Kontrollieren:
Lager
Den Innenlaufring mit den Fin-
gern drehen.
Stockend/fest
→ Erneuern.
HINWEIS:
Lager, Dichtring und Distanzhülse
satzweise erneuern. POINTS DE DEPOSE
Roue arrière
1. Déposer:
Roue 1
N.B.:
Pousser la roue vers l’avant et déposer la
chaîne de transmission 2.
Roulement de roue (si nécessaire)
1. Déposer:
Roulement 1
N.B.:
Déposer le roulement à l’aide d’un arra-
che-roulement courant 2.
CONTROLE
Roue
1. Mesurer:
Voile de roue
Hors spécifications → Réparer/
remplacer.
Limite de voile de roue:
Radial 1:
2,0 mm (0,08 in)
Latéral 2:
2,0 mm (0,08 in)
2. Contrôler:
Roulement
Faire tourner la cage interne avec
le doigt.
Rugosité/grippage → Remplacer.
N.B.:
Remplacer ensemble les roulements, la
bague d’étanchéité et l’entretoise épau-
lée de roue.PUNTI DI RIMOZIONE
Ruota posteriore
1. Togliere:
Ruota 1
NOTA:
Spingere la ruota in avanti e togliere la
catena di trasmissione 2.
Cuscinetto della ruota (se necessario)
1. Togliere:
Cuscinetto 1
NOTA:
Togliere il cuscinetto con un normale
estrattore di cuscinetti 2.
CONTROLLO
Ruota
1. Misurare:
Scentratura ruota
Fuori limite → Riparare/sostituire.
Limite di disassamento della
ruota:
Radiale 1:
2,0 mm (0,08 in)
Laterale 2:
2,0 mm (0,08 in)
2. Controllare:
Cuscinetto
Ruotare la pista interna con un
dito.
Punto ruvido/blocco → Sostitu-
ire.
NOTA:
Sostituire i cuscinetti, il paraolio e il col-
larino della ruota in blocco.
ROUE AVANT ET ROUE ARRIERE
VORDER- UND HINTERRAD
RUOTA ANTERIORE E POSTERIORE