Checking The Decompression System; Installing The Camshafts - Yamaha YZ450F Owner's Service Manual

2015
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CHECKING THE DECOMPRESSION SYS-
EAS1SL5213
TEM
1. Check:
• Decompression system
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a. Check that the decompressor cam "1"
moves smoothly.
b. Check that the decompressor lever pin "2"
projects from the camshaft.
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INSTALLING THE CAMSHAFTS

EAS1SL5214
1. Install:
• Exhaust camshaft "1"
• Intake camshaft "2"
2
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a. Turn the crankshaft counterclockwise with a
wrench.
TIP
• Apply molybdenum disulfide oil to the cam-
shafts.
• Apply the engine oil on the decompression
system.
• Fill the cylinder head with engine oil up to the
tops "a" of the valve lifters.
a
b. Align the top dead center (TDC) mark "a" on
the rotor with the alignment mark "b" on the
crankcase cover.
c. Fit the timing chain "3" onto both camshaft
sprockets and install the camshafts on the
cylinder head.
1
TIP
Make sure that the alignment mark "c" on the
exhaust camshaft sprocket and the alignment
mark "d" on the intake camshaft sprocket are
aligned with the edge of the cylinder head.
d
ECA33DD029
NOTICE
Do not turn the crankshaft during the cam-
shaft installation. Damage or improper
valve timing will result.
d. Install the clips, the camshaft caps and the
bolts (camshaft cap).
5-16
CAMSHAFT
a
3
Bolt (camshaft cap)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
a
b
a
c

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