Yamaha YZF-R1S Service Manual - Eng
5-81
CONNECTING RODS AND PISTONS
ENG
NOTE:
NOTE:
Piston ring side clearance
Top ring
0.030
X 0.065 mm
(0.0012
X 0.0026 in)
2nd ring
0.020
X 0.055 mm
(0.0008
X 0.002 in)
2. Install:
Spiston ring
(into the cylinder)
Level the piston ring into the cylinder with the
piston crown.
a
5 mm (0.20 in)
3. Measure:
Spiston ring end gap
Out of specification
! Replace the piston
ring.
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
Piston ring end gap
Top ring
0.15
X 0.25 mm
(0.0059
X 0.0098 in)
2nd ring
0.30
X 0.45 mm
(0.0118
X 0.0177 in)
Oil ring
0.10
X 0.40 mm
(0.0039
X 0.0158 in)
CHECKING THE PISTON PINS
The following procedure applies to all of the pis-
ton pins.
1. Check:
Spiston pin
Blue discoloration / grooves
! Replace the
piston pin and then check the lubrication sys-
tem.