Yamaha YFZ450S 2003 Service Manual page 83

ADJUSTING THE VALVE CLEARANCE
EXAMPLE:
Original valve pad number = 148 {thickness =
1.48 mm (0.058 in)}
Rounded value = 150
d. Locate the rounded number of the original
valve pad and the measured valve clear-
ance in the valve pad selection table. The
point where the column and row intersect is
the new valve pad number.
NOTE:
_
The new valve pad number is only an approxi-
mation. The valve clearance must be mea-
sured again and the above steps should be
repeated if the measurement is still incorrect.
e. Install the new valve pad 1 and the valve
lifter 2.
NOTE:
_
• Lubricate the valve pad with molybdenum
disulfide oil.
• Lubricate the valve lifter with engine oil.
• The valve lifter must turn smoothly when
rotated by hand.
• Install the valve lifter and the valve pad in the
correct place.
f. Install the exhaust and intake camshafts,
timing chain and the camshaft caps.
Camshaft cap bolt
10 Nm (1.0 m · kg, 7.2 ft · lb)
NOTE:
_
• Refer to "INSTALLING THE CAMSHAFTS —
CAMSHAFTS" in chapter 4.
• Lubricate the camshaft bearings, camshaft
lobes and camshaft journals.
• First, install the exhaust camshaft.
• Align the camshaft sprocket marks with the
edge of the cylinder head.
• Turn the crankshaft counterclockwise sev-
eral full turns to seat the parts.
g. Measure the valve clearance again.
h. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
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