Yamaha WR450FR Owner's Service Manual page 152

CYLINDER HEAD
ASSEMBLY AND INSTALLATION
1. Install:
Timing chain guide (front) 1
G
Dowel pin 2
G
Cylinder head gasket 3
G
Cylinder head 4
G
NOTE:
While pulling up the timing chain, install the
timing chain guide (front) and cylinder head.
2. Install:
Plain washer 1
G
Bolt [L=160 mm (6.30 in)] 2
G
Bolt [L=150 mm (5.91 in)] 3
G
Installation steps:
CAUTION:
Tighten the cylinder head using the rota-
tion angle procedure to obtain uniform
tightening torque.
Wash the threads and contact surfaces of
G
the bolts, the contact surfaces of the plain
washers, the contact surface of the cylin-
der head, and the threads of the crank-
case.
Apply the molybdenum disulfide grease on
G
the threads and contact surfaces of the
bolts and on both contact surfaces of the
plain washers.
Install the plain washers and bolts.
G
Tighten the bolts to the specified torque in
G
two or three steps in the proper tightening
sequence as shown.
Bolts (cylinder head):
1st:
30 Nm (3.0 m • kg, 22 ft • lb)
4 - 31
ENG
New