Yamaha YZF-R1 2015, Service Manual

Page: 182 / 704

PERIODIC MAINTENANCE
3-8
b. Calculate the difference between the speci-
fied valve clearance and the measured valve
clearance.
Example:
Specified valve clearance = 0.09–0.17 mm
(0.004–0.007 in)
Measured valve clearance = 0.20 mm (0.008
in)
0.20 mm (0.008 in)–0.17 mm (0.007 in) =
0.03 mm (0.001 in)
c. Check the thickness of the current valve pad.
TIP
• The letter and number “a” marked on the valve
pad indicate the valve pad thickness.
•
The letter A marked on the valve pad indicates
1 mm (0.04 in), while B indicates 2 mm (0.08
in).
• The number marked on the valve pad indicates
hundredths of millimeters.
Example:
If the valve pad is marked “A60”, the pad
thickness is 1.60 mm (0.063 in).
If the valve pad is marked “B30”, the pad
thickness is 2.30 mm (0.091 in).
d. Calculate the sum of the values obtained in
steps (b) and (c) to determine the required
valve pad thickness and the valve pad num-
ber.
Example:
1.60 mm (0.063 in) + 0.03 mm (0.001 in) =
1.63 mm (0.064 in)
The valve pad number is A63.
e. Round off the valve pad number according to
the following table, and then select the suit-
able valve pad.
TIP
Refer to the following table for the available
valve pads.
Example:
Valve pad number = A63
Rounded value = A65
New valve pad number = A65
f. Install the new valve pad “3” and then, push
the rocker arm “1” down.
TIP
•
Lubricate the valve pad with molybdenum di-
sulfide oil.
•
Install the valve pad in the correct place.
g. Install the exhaust and intake camshafts, tim-
ing chain and camshaft caps.
TIP
• Refer to “CAMSHAFTS” on page 5-9.
• Lubricate the camshaft lobes and camshaft
journals.
•
First, install the exhaust camshaft.
2
a
Last digit Rounded value
0, 1, 2 0
3, 4, 5, 6 5
7, 8, 9 10
Valve pad range No. A60–A99, B00–B40
Valve pad thickness
1.60–2.40 mm
(0.0630–0.0944 in)
Available valve pads
17 thicknesses in 0.05
mm (0.002 in) incre-
ments
Camshaft cap bolt
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Camshaft cap bolt (new)
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
3
1
T
R
.
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