Yamaha WR450FB 2012 Owner's Service Manual page 218

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2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of
specification~
Replace the cam-
shaft.
Camshaft lobe dimensions
Intake A
30.100--30.200
mm
(1.1850-
1.1890 in)
Limit
30.000
mm
(1.1811
in)
Intake B
22.450-22.550
mm
(0.8839-
0.8878
in)
Limit
22.350
mm
(0.8799
in)
Exhaust
A
30.200-30.300
mm
(1.1890-
1.1929
in)
Limit
30.100
mm
(1.1850
in)
Exhaust B
22.450-22.550
mm
(0.8839-
0.8878
in)
Limit
22.350
mm
(0.8799
in)
3. Measure:
• Camshaft runout
Out of
specification~
Replace.
Camshaft runout limit
0.015
mm
(0.0006
in)
CAMSHAFT
11151402
4. Measure:
•Camshaft-journal-to-camshaft-cap clear-
ance
Out of
specification~
Measure the cam-
shaft journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
· 0.028-0.062
mm
(0.0011--0.0024
in)
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Install the camshaft into the cylinder head.
b. Position a strip of Plastigauge® "1" onto the
camshaft journal as shown.
o~
c. Install the dowel pins and camshaft caps.
TIP _ _ _ _ _ _ _ _ _ _ _ _ _
•Tighten the camshaft cap bolts in a crisscross
pattern from innermost to outer caps.
• Do not turn the camshaft when measuring the
camshaft journal-to-camshaft cap clearance.
6-10
Camshaft cap bolt
10
Nm
(1.0
m·kgf,
7.2
ft·lbf)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "1".

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