Yamaha YZ450F(S), Owner'S Service Manual

Page: 302 / 642

4 - 32
ENG
●
Remove the bolts.
●
Again apply the molybdenum disulfide
grease on the threads and contact sur-
faces of the bolts and on both contact sur-
faces of the plain washers.
●
Retighten the bolts.
NOTE:
Tighten the bolts to the specified torque in
two or three steps in the proper tightening
sequence as shown.
T
R
.
.
Bolts (cylinder head):
2nd:
20 Nm (2.0 m • kg, 14 ft • lb)
●
Put a mark on the corner 1 of the bolt
(cylinder head) and the cylinder head 2
as shown.
NOTE:
Tighten the bolts 90˚ in each of the two
steps to reach the specified angle of 180˚ in
the proper tightening sequence as shown.
T
R
.
.
Bolts (cylinder head):
Final:
Specified angle 180˚
1
2
180˚
3. Install:
●
Cable guide 1
●
Nut (cylinder head) 2
T
R
.
.
10 Nm (1.0 m · kg, 7.2 ft · lb)
4. Install:
●
Copper washer 1
●
Oil delivery pipe 2
●
Union bolt (M8) 3
●
Union bolt (M10) 4
New
T
R
.
.
18 Nm (1.8 m · kg, 13 ft · lb)
T
R
.
.
20 Nm (2.0 m · kg, 14 ft · lb)
CYLINDER HEAD