Yamaha YZ450FT Owner's Service Manual page 139

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.
2. Install:
• Plain washer 1
• Bolt [L = 160 mm (6.30 in)] 2
• Bolt [L = 150 mm (5.91 in)] 3
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.
Bolts (cylinder head):
1st:
30 Nm (3.0 m • kg, 22 ft • lb)
4 - 31
ENG
New