Yamaha FZ6-ST Supplementary Service Manual page 323

CONNECTING RODS AND PISTONS
b. If out of specification, replace the cylinder,
c. Measure piston skirt diameter "P" with the
d. If out of specification, replace the piston and
e. Calculate the piston-to-cylinder clearance
f. If out of specification, replace the cylinder,
EAS00263
CHECKING THE PISTON RINGS
1. Measure:
NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
5-70
Cylinder bore "C"
Wear limit
Taper limit "T"
Out of round "R"
"C" = maximum of D
"T" = maximum of D
of D or D
5 6
"R" = maximum of D
minimum of D
and the pistons and piston rings as a set.
micrometer.
a 4 mm (0.16 in) from the bottom edge of the piston
Piston size "P"
65.475 X 65.490 mm
(2.5778 X 2.5783 in)
piston rings as a set.
with the following formula.
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance
0.010 X 0.035 mm
(0.0004 X 0.0014 in)
<Limit>: 0.055 mm (0.0022 in)
and the piston and piston rings as a set.
S piston ring side clearance
Out of specification ! Replace the piston
and piston rings as a set.
ENG
65.50 X 65.51 mm
(2.5787 X 2.5791 in)
65.56 mm
(2.5811 in)
0.05 mm (0.002 in)
0.05 mm (0.002 in)
X D
1 6
or D – maximum
1 2
D or D –
1 3 5
D or D
2 4 6