Yamaha R6 2009, Service Manual

Page: 269 / 434

CONNECTING RODS AND PISTONS
5-60
2. Install:
• Piston ring
(into the cylinder)
TIP
Level the piston ring into the cylinder with the
piston crown.
3. Measure:
• Piston ring end gap
Out of specification
→
Replace the piston
ring.
TIP
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.
EAS24440
CHECKING THE PISTON PINS
The following procedure applies to all of the
piston pins.
1. Check:
• Piston pin
Blue discoloration/grooves
→
Replace
the piston pin and then check the lubrica-
tion system.
2. Measure:
• Piston pin outside diameter “a”
Out of specification
→
Replace the piston
pin.
3. Measure:
• Piston pin bore diameter “b”
Out of specification
→
Replace the pis-
ton.
a. 5 mm (0.20 in)
Piston ring
Top ring
End gap (installed)
0.25–0.35 mm (0.0098–0.0138
in)
Limit
0.60 mm (0.0236 in)
2nd ring
End gap (installed)
0.70–0.80 mm (0.0276–0.0315
in)
Limit
1.15 mm (0.0453 in)
Oil ring
End gap (installed)
0.10–0.35 mm (0.0039–0.0138
in)
Piston pin outside diameter
14.991–15.000 mm (0.5902–
0.5906 in)
Limit
14.971 mm (0.5894 in)