Checking The Piston Rings - Yamaha Sirius T110LSE Service Manual

CYLINDER AND PISTON
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance
0.020 – 0.025 mm
(0.0008 – 0.0010 in)
<Limit>: 0.15 mm (0.0059 in)
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
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EAS00263

CHECKING THE PISTON RINGS

1. Measure:
9piston 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
Top ring
0.03 – 0.07 mm
(0.0012 – 0.0028 in)
<Limit>: 0.12 mm (0.0047 in)
2nd ring
0.02 – 0.06 mm
(0.0008 – 0.0024 in)
<Limit>: 0.12 mm (0.0047 in)
2. Install:
9piston ring
(into the cylinder)
NOTE:
Level the piston ring into the cylinder with the
piston crown.
a 40 mm
4-34
ENG