Yamaha YZF-R1 2007 Service Manual

CAMSHAFTS5-12EAS23850CHECKING THE CAMSHAFTS1. Check:• Camshaft lobesBlue discoloration/pitting/scratches →Replace the camshaft.2. Measure:• Camshaft lobe dimensions “a” and “b”Out of specification → Replace the cam-shaft.3. Measure:• Camshaft runoutOut of specification → Replace.4. Measure:• Camshaft-journal-to-camshaft-cap clear-anceOut of specification → Measure the cam-shaft journal diameter.▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼a. Install the camshaft into the cylinder head(without the dowel pins and camshaftcaps).b. Position strip of Plastigauge® “1” onto thecamshaft journal as shown.c. Install the dowel pins and camshaft caps.NOTE:• Tighten the camshaft cap bolts in stages andin a crisscross pattern, working from theinner caps out.• Do not turn the camshaft when measuringthe camshaft journal-to-camshaft cap clear-ance with the Plastigauge®.d. Remove the camshaft caps and then mea-sure the width of the Plastigauge® “2”.Camshaft lobe dimension limitIntake A34.450–34.550 mm (1.3563–1.3602 in)Limit34.350 mm (1.3524 in)Intake B25.170–25.270 mm (0.9909–0.9949 in)Limit25.070 mm (0.9870 in)Exhaust A33.550–33.650 mm (1.3209–1.3248 in)Limit33.450 mm (1.3169 in)Exhaust B25.192–25.292 mm (0.9918–0.9957 in)Limit25.092 mm (0.9879 in)Camshaft runout limit0.030 mm (0.0012 in)Camshaft-journal-to-camshaft-cap clearance0.028–0.062 mm (0.0011–0.0024 in)Camshaft cap bolt10 Nm (1.0 m·kg, 7.2 ft·lb)Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keysemail: info@motomatrix.co.uk