Yamaha XP500 2001 - Checking the Piston Rings

5-58
CYLILNDER AND PISTON
ENG
NOTE:
NOTE:
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
0.020  0.045 mm
<Limit>: 0.15 mm
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
EAS00263
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.
Piston ring side clearance
Top ring
0.030  0.065 mm
<Limit>: 0.115 mm
2nd ring
0.020  0.055 mm
<Limit>: 0.105 mm
2. Install:
 piston ring
(into the cylinder)
Level the piston ring in the cylinder with the pis-
ton crown as shown.
a
10 mm