Yamaha YZ450F, Owner'S Service Manual

Page: 296 / 650

4 - 28
ENG
CAMSHAFTS
• Fit the timing chain
3
onto both camshaft
sprockets and install the camshafts on the
cylinder head.
NOTE:
The camshafts should be installed onto the
cylinder head so that the exhaust cam
sprocket punch mark
c
and the intake cam
sprocket punch mark
d
align with the sur-
face of the cylinder head.
CAUTION:
Do not turn the crankshaft during the
camshaft installation. Damage or
improper valve timing will result.
• Install the clips and camshaft caps
4
.
T
R
.
.
Bolt (camshaft cap):
10 Nm (1.0 m • kg, 7.2 ft • lb)
NOTE:
• Apply the molybdenum disulfide oil on the
thread of the bolts (camshaft cap)
5
.
• Tighten the bolts to the specified torque in
two or three steps in the proper tightening
sequence as shown.
CAUTION:
The bolts (camshaft cap) must be tight-
ened evenly, or damage to the cylinder
head, camshaft caps, and camshaft will
result.
2. Install:
• Timing chain tensioner
Installation steps:
• While pressing the tensioner rod lightly
with fingers, use a thin screwdriver and
wind the tensioner rod up fully clockwise.