Yamaha YZF-R1 Series Service Manual page 308

Camshaft runout limit
0.050 mm (0.0020 in)
4. Measure:
• Camshaft-journal-to-camshaft-cap clearance
Out of specification → Measure the camshaft
journal diameter.
Camshaft-journal-to-camshaft-
cap clearance
0.028–0.062 mm (0.0011–0.0024
in)
Limit
0.080 mm (0.0032 in)
a. Install the camshaft into the cylinder head
(without the camshaft caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
1
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c. Install the dowel pins and camshaft caps.
ECA23010
NOTICE
There are two kinds of camshaft cap bolts
with different lengths. Be sure to install each
bolt onto the correct position.
a b
a. Camshaft cap bolt (black): 40 mm (1.57 in)
b. Camshaft cap bolt (silver): 35 mm (1.38 in)
A. Intake side
B. Exhaust side
TIP
• If the camshaft cap bolt is a new one, it is not
necessary to apply engine oil onto the mating
surface and threads of the bolt.
• If the camshaft cap bolt is a new one, tighten it
to 10 N·m (1.0 kgf·m, 7.4 lb·ft).
• Tighten the camshaft cap bolts in stages and in
a crisscross pattern, working from the inner
caps out.
• Do not turn the camshaft when measuring the
camshaft journal-to-camshaft-cap clearance
with the Plastigauge®.
Camshaft cap bolt
8 N·m (0.8 kgf·m, 5.9 lb·ft)
Camshaft cap bolt (new)
10 N·m (1.0 kgf·m, 7.4 lb·ft)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "1".
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5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the camshaft.
Within specification → Replace the cylinder
head and the camshaft caps as a set.
5-25
CAMSHAFTS
a b
1