Yamaha WR450F, Owner'S Service Manual

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ENG
CYLINDER HEAD
ASSEMBLY AND INSTALLATION
1. Install:
• Timing chain guide (front)
1
• Dowel pin
2
• Cylinder head gasket
3
• Cylinder head
4
NOTE:
While pulling up the timing chain, install the
timing chain guide (front) and cylinder head.
New
2. Install:
• Plain washer
1
• Bolt
2
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
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
the threads and contact surfaces of the
bolts and on both contact surfaces of the
plain washers.
• Install the plain washers and bolts.
• Tighten the bolts to the specified torque in
two or three steps in the proper tightening
sequence as shown.
T
R
.
.
Bolts (cylinder head):
1st:
30 Nm (3.0 m • kg, 22 ft • lb)