Yamaha YZF-R1B 2012 Service Manual

Also see for YZF-R1 2012: Service manual

Contents

CONNECTING RODS AND PISTONS5-772. Install:• Piston ring(into the cylinder)TIPLevel the piston ring into the cylinder with thepiston crown.3. Measure:• Piston ring end gapOut of specification → Replace the pistonring.TIPThe oil ring expander spacer’s end gap cannotbe measured. If the oil ring rail’s gap is exces-sive, replace all three piston rings.EAS24440CHECKING THE PISTON PIN1. Check:• Piston pinBlue discoloration/grooves → Replacethe piston pin and then check the lubrica-tion system.2. Measure:• Piston pin outside diameter “a”Out of specification → Replace the pistonpin.3. Measure:• Piston pin bore inside diameter “b”Out of specification → Replace the pis-ton.Piston ring side clearanceTop ring0.030–0.065 mm (0.0012–0.0026 in)Limit0.115 mm (0.0045 in)2nd ring0.020–0.055 mm (0.0008–0.0022 in)Limit0.115 mm (0.0045 in)a. 10 mm (0.4 in)Piston ring end gapTop ring0.15–0.25 mm (0.0059–0.0098in)Limit0.50 mm (0.0197 in)2nd ring0.30–0.45 mm (0.0118–0.0177in)Limit0.80 mm (0.0315 in)Oil ring0.10–0.40 mm (0.0039–0.0157in)Piston pin outside diameter16.991–17.000 mm (0.6689–0.6693 in)Limit16.971 mm (0.6682 in)Piston pin bore inside diameter17.002–17.013 mm (0.6694–0.6698 in)Limit17.043 mm (0.6710 in)Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keysemail: info@motomatrix.co.uk