Checking The Camshafts - Yamaha YZF-R1 2007 Service Manual

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EAS23850

CHECKING THE CAMSHAFTS

1. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches →
Replace the camshaft.
2. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the cam-
shaft.
Camshaft lobe dimension limit
Intake A
34.450–34.550 mm (1.3563–
1.3602 in)
Limit
34.350 mm (1.3524 in)
Intake B
25.170–25.270 mm (0.9909–
0.9949 in)
Limit
25.070 mm (0.9870 in)
Exhaust A
33.550–33.650 mm (1.3209–
1.3248 in)
Limit
33.450 mm (1.3169 in)
Exhaust B
25.192–25.292 mm (0.9918–
0.9957 in)
Limit
25.092 mm (0.9879 in)
email: info@motomatrix.co.uk
3. Measure:
• Camshaft runout
Out of specification → Replace.
Camshaft runout limit
0.030 mm (0.0012 in)
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)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft
caps).
b. Position strip of Plastigauge® "1" onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
NOTE:
• 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 clear-
ance with the Plastigauge®.
Camshaft cap bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "2".
5-12
CAMSHAFTS