Yamaha YZ250F(S) Owner's Service Manual page 316

CYLINDER HEAD
ASSEMBLY AND INSTALLATION
Cylinder head
1. Install:
Dowel pin 1
G
Cylinder head gasket 2
G
Timing chain guide (exhaust side) 3
G
Cylinder head 4
G
NOTE:
While pulling up the timing chain, install the
timing chain guide (exhaust side) and cylinder
head.
2. Install:
Washer 1
G
Cable guide 2
G
Bolts [L=145 mm (5.71 in)] 3
G
Bolts [L=135 mm (5.31 in)] 4
G
Nuts 5
G
NOTE:
Apply the molybdenum disulfide grease on
G
the thread and contact surface of the bolts.
Follow the numerical order shown in the illus-
G
tration. Tighten the bolts and nuts in two
stages.
3. Install:
Copper washer 1
G
Oil delivery pipe 2
G
Union bolt (M8) 3
G
Union bolt (M10) 4
G
4. Install:
Radiator pipe 1
G
Bolt (radiator pipe) 2
G
4 - 32
ENG
38 Nm (3.8 m · kg, 27 ft · lb)
38 Nm (3.8 m · kg, 27 ft · lb)
10 Nm (1.0 m · kg, 7.2 ft · lb)
18 Nm (1.8 m · kg, 13 ft · lb)
20 Nm (2.0 m · kg, 14 ft · lb)
10 Nm (1.0 m · kg, 7.2 ft · lb)