Yamaha WR250FM Bicycle User Manual


 
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ENG
CYLINDER HEAD
ASSEMBLY AND INSTALLATION
Cylinder head
1. Install:
Dowel pin 1
Cylinder head gasket 2
Timing chain guide (exhaust side) 3
Cylinder head 4
N
OTE:
While pulling up the timing chain, install the
timing chain guide (exhaust side) and cylinder
head.
2. Install:
Washer 1
Cable guide 2
Bolts [L=145 mm (5.71 in)] 3
Bolts [L=135 mm (5.31 in)] 4
Nuts 5
N
OTE:
Apply the molybdenum disulfide grease on
the thread and contact surface of the bolts.
Follow 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)
New
3. Install:
Copper washer 1
Oil delivery pipe 2
Union bolt (M8) 3
Union 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)
New
4. Install:
Radiator pipe 1
Bolt (radiator pipe) 2
T
R
.
.
10 Nm (1.0 m · kg, 7.2 ft · lb)