Yamaha YZF-R1 2007 Service Manual

CRANKSHAFT5-732. Install:• Piston ring(into the cylinder)NOTE:Level the piston ring into the cylinder with thepiston crown.3. Measure:• Piston ring end gapOut of specification → Replace the pistonring.NOTE:The 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 → Replace thepiston pin and then check the lubricationsystem.2. Measure:• Piston pin outside diameter “a”Out of specification → Replace the pistonpin.3. Measure:• Piston pin bore diameter “b”Out of specification → Replace the piston.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. 5 mm (0.20 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