Checking The Piston Rings - Yamaha XJR1300 2007 Service Manual

b
b. 5 mm (0.20 in) from the bottom edge of the piston
Piston diameter "D"
78.970–78.985 mm
(3.1090–3.1096 in)
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
Piston-to-cylinder clearance
Cylinder bore "C" -
Piston skirt diameter "D"
Piston-to-cylinder clearance
0.015–0.040 mm (0.0006–0.0016
in)
Limit
0.15 mm (0.0059 in)
f. If out of specification, replace the cylinder,
and replace the piston and piston rings as a
set.
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EAS24430

CHECKING THE PISTON RINGS

1. Measure:
Piston ring side clearance
G
Out of specification → Replace the piston
and piston rings as a set.
NOTE:
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
a
CYLINDER AND PISTON
piston ring side clearance
Top ring
Ring side clearance
0.045–0.080 mm (0.0018–0.0032
in)
Limit
0.100 mm (0.0039 in)
2nd ring
Ring side clearance
0.030–0.070 mm (0.0012–0.0028
in)
Limit
0.100 mm (0.0039 in)
2. Install:
Piston ring
G
(into the cylinder)
NOTE:
Level the piston ring into the cylinder with the
piston crown.
a. 30 mm (1.18 in)
3. Measure:
Piston ring end gap
G
Out of specification → Replace the piston
ring.
NOTE:
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.
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a