Yamaha FZ1-N Service Manual

Contents

CRANKSHAFT5-742. Install:• Piston ring(into the cylinder)NOTE:Level the piston ring into the cylinder with thepiston crown.5 mm (0.20 in) “a”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.ET2D1016CHECKING THE PISTON PINSThe following procedure applies to all of thepiston pins.1. 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 inside 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)Piston ring end gapTop ring0.15–0.25 mm(0.0059–0.0098 in)Limit0.50 mm (0.0197 in)2nd ring0.30–0.45 mm(0.0118–0.0177 in)Limit0.80 mm (0.0315 in)Oil ring0.10–0.40 mm(0.0039–0.0157 in)Piston pin bore outside diame-ter16.991–17.000 mm(0.6689–0.6693 in)Limit16.971 mm (0.6682 in)