Checking The Piston Pin - Yamaha 2009 YZF-R1 (Y) Service Manual

Piston ring side clearance
Top ring
0.030–0.065
0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
0.020–0.055
0.0022 in)
Limit
0.115 mm (0.0045 in)
2. Install:
• Piston ring
(into the cylinder)
TIP
Level the piston ring into the cylinder with the
piston crown.
a. 10 mm (0.4 in)
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.
CONNECTING RODS AND PISTONS
mm (0.0012–
mm (0.0008–
5-78
Piston ring end gap
Top ring
0.15–0.25 mm (0.0059–0.0098
in)
Limit
0.50 mm (0.0197 in)
2nd ring
0.30–0.45 mm (0.0118–0.0177
in)
Limit
0.80 mm (0.0315 in)
Oil ring
0.10–0.40 mm (0.0039–0.0157
in)
EAS24440

CHECKING THE PISTON PIN

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.
Piston pin outside diameter
16.991–17.000 mm (0.6689–
0.6693 in)
Limit
16.971 mm (0.6682 in)
3. Measure:
• Piston pin bore inside diameter "b"
Out of specification → Replace the pis-
ton.
Piston pin bore inside diameter
17.002–17.013 mm (0.6694–
0.6698 in)
Limit
17.043 mm (0.6710 in)