Yamaha XVZ13TF 1999, Service Manual

Page: 234 / 501

4-90
CONNECTING RODS AND PISTONS
ENG
NOTE:
c. Measure piston skirt diameter “P” with the
micrometer.
b 4 mm from the bottom edge of the piston.
Piston size P
Standard 78.926 78.933 mm
Oversize 2 79.25 mm
Oversize 4 79.50 mm
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 “P”
Piston-to-cylinder clearance
0.055 0.069 mm
<Limit>: 0.15 mm
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
EAS00264
CHECKING THE PISTON RINGS
1. Measure:
piston ring side clearance
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.