Checking The Piston Rings - Yamaha XP500 2001 Service Manual

CYLILNDER AND PISTON
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
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
EAS00263

CHECKING THE PISTON RINGS

1. Measure:
S piston ring side clearance
Out of specification ! Replace the piston
and piston rings as a set.
NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
2. Install:
S piston ring
(into the cylinder)
NOTE:
Level the piston ring in the cylinder with the pis-
ton crown as shown.
a 10 mm
5-58
ENG
0.020 X 0.045 mm
<Limit>: 0.15 mm
Top ring
0.030 X 0.065 mm
<Limit>: 0.115 mm
2nd ring
0.020 X 0.055 mm
<Limit>: 0.105 mm