Yamaha FZS600'98, Service Manual

Page: 139 / 364

4-27
CYLINDER AND PISTON
ENG
P
a
“C” =
X + Y
2
NOTE:
Standard Wear limit
Cylinder
bore “C”
62.00 62.01 62.1 mm
b. If out of specification, replace the cylin-
der, piston and piston rings as a set.
c. Measure piston skirt diameter “P” with the
micrometer.
a 5 mm from the bottom edge of the piston.
Piston size P
Standard 61.960 61.975
d. If out of specification, replace the piston
and piston rings as a set.
e. Calculate the piston-to-cylinder clear-
ance with the following formula.
Piston-to-
cylinder
clearance
=
cylinder bore “C” –
Piston skirt
diameter “P”
Piston-to-cylinder clearance
0.025 0.050 mm
<Limit>: 0.07 mm
f. If out of specification, replace the cylin-
der, piston and piston rings as a set.
EB404410
CHECKING THE PISTON RINGS
1. Measure:
piston ring side clearance 1
Out of specification Replace the piston
and piston rings as a set.
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from
the piston ring grooves and piston rings.
Piston ring side clearance
Top ring
0.020 0.075 mm
<Limit>: 0.1 mm
2nd ring
0.020 0.055 mm
<Limit>: 0.1 mm