Yamaha YZ426F(M)/LC Owner's Service Manual page 74

Camshaft runout limit
Cam chain:
Cam chain type/No. of links
Cam chain adjustment method
Valve, valve seat, valve guide:
Valve clearance (cold)
Valve dimensions:
A
Head Diameter
"A" head diameter
"B" face width
"C" seat width
"D" margin thickness
Stem outside diameter
Guide inside diameter
Stem-to-guide clearance
MAINTENANCE SPECIFICATIONS
Item
IN
EX
B
Face Width
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
Standard
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92RH2010-120MPX/120
Automatic
0.15 ~ 0.20 mm
(0.0059 ~ 0.0079 in)
0.25 ~ 0.30 mm
(0.0098 ~ 0.0118 in)
C
Seat Width
26.9 ~ 27.1 mm
(1.0591 ~ 1.0669 in)
27.9 ~ 28.1 mm
(1.0984 ~ 1.1063 in)
2.26 mm (0.089 in)
2.26 mm (0.089 in)
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
1 mm (0.0394 in)
1 mm (0.0394 in)
4.475 ~ 4.490 mm
(0.1762 ~ 0.1768 in)
4.960 ~ 4.975 mm
(0.1953 ~ 0.1959 in)
4.500 ~ 4.512 mm
(0.1772 ~ 0.1776 in)
5.000 ~ 5.012 mm
(0.1969 ~ 0.1973 in)
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
2 - 5
SPEC
Limit
0.03 mm
(0.0012 in)
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----
----
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D
Margin Thickness
----
----
----
----
1.5 mm
(0.0591 in)
1.5 mm
(0.0591 in)
0.85 mm
(0.033 in)
0.85 mm
(0.033 in)
----
----
----
----
0.08 mm
(0.003 in)
0.10 mm
(0.004 in)