Yamaha YZF-R1(B) 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

CAMSHAFTS5-184. 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 camshaft caps).b. Position strip of Plastigauge® “1” onto thecamshaft journal as shown.c. Install the camshaft caps.TIP• 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”.▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲5. Measure:• Camshaft journal diameter “a”Out of specification → Replace the cam-shaft.Within specification → Replace the cylin-der head and the camshaft caps as a set.EAS23870CHECKING THE TIMING CHAIN ANDSPROCKET1. Check:• Timing chainDamage/stiffness → Replace the timingchain, camshaft sprockets and crankshaftsprocket as a set.2. Check:• Camshaft sprocket• Crankshaft sprocketMore than 1/4 tooth wear “a” → Replacethe camshaft sprockets, crankshaftsprocket and timing chain as a set.Camshaft-journal-to-camshaft-cap clearance0.028–0.062 mm (0.0011–0.0024 in)Camshaft cap bolt10 Nm (1.0 m·kgf, 7.2 ft·lbf)Camshaft journal diameter25.459–25.472 mm (1.0023–1.0028 in)