AUX YAMAHA WR 250F 2007 Notices Demploi (in French)

YAMAHA WR 250F 2007 Notices Demploi (in French) WR 250F 2007 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52333/w960_52333-0.png YAMAHA WR 250F 2007 Notices Demploi (in French)

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YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 53
ENGCAMSHAFTS
REMOVAL POINTS
Camshaft
1. Remove:
Timing mark accessing screw
1 
Crankshaft end accessing
screw 
2 
2. Align:
T.D.C. mark
With align mark.
Checking steps:
Turn the crankshaft

Page 462 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 55
ENGCAMSHAFTS
5. Remove:
Exhaust camshaft 
1 
Intake camshaft 
2 
NOTE:Attach a wire 
3 to the timing chain to
prevent it from falling into the crank-
case.
1
2
3
INSPECTION
Camshaft
1. Inspec

Page 464 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 57
ENGCAMSHAFTS
4. Measure:
Camshaft-to-cap clearance 
Out of specification 
→ Mea-
sure camshaft outside diame-
ter. 
5. Measure: 
Camshaft outside diameter 
a 
Out of specification 
→ 
Rep

Page 468 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 61
ENGCAMSHAFTS
Fit the timing chain 
3 onto both
camshaft sprockets and install
the camshafts on the cylinder
head.
NOTE:The camshafts should be installed
onto the cylinder head so that the
punc

Page 475 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 68
ENG
CULASSE
Organisation de la dépose:1 Dépose de la culasse
Organisation de la dépose Ordre Nom de la pièce QtéRemarques
DEPOSE DE LA CULASSE
Préparation à la dépose Selle et réservoi

Page 492 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 85
ENGVALVES AND VALVE SPRINGS
5. Measure:
Runout (valve stem)
Out of specification 
→ 
Replace.
NOTE:When installing a new valve
always replace the guide.
If the valve is removed or replaced

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YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 87
ENGVALVES AND VALVE SPRINGS
9. Lap:
Valve face
Valve seat
NOTE:After refacing the valve seat or
replacing the valve and valve guide,
the valve seat and valve face should
be lapped.
Lapping st

Page 498 of 912

YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 91
ENGVALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
Valve and valve spring
1. Apply:
Molybdenum disulfide oil
Onto the valve stem and valve
stem seal.
2. Install:
Valve 
1 
Valve spring se

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YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 121
ENGCLUTCH
Friction plate
1. Measure:
Friction plate thickness
Out of specification 
→ 
Replace friction plate as a set.
Measure at all four points.
Friction plate thickness:
2.9 ~ 3.1 mm 
(

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YAMAHA WR 250F 2007  Notices Demploi (in French) 5 - 125
ENGCLUTCH
4. Install:
Seat plate 
1 
Cushion spring 
2 
NOTE:Install the seat plate with its cham-
fered portion 
a facing the clutch
boss 
3.
Install the seat plate so that it is not
caug