Checking The Piston Pin - Yamaha Sirius T110LSE Service Manual

CYLINDER AND PISTON
3. Measure:
9piston ring end gap
Out of specification → Replace the piston
ring.
NOTE:
The end gap of the oil ring expander cannot be
measured. If the end gaps of the oil ring rails
are excessive, replace all three piston rings.
Piston ring end gap
Top ring
0.10 – 0.25 mm
(0.0039 – 0.0098 in)
<Limit>: 0.4 mm (0.0157 in)
2nd ring
0.10 – 0.25 mm
(0.0039 – 0.0098 in)
<Limit>: 0.4 mm (0.0157 in)
Oil ring rails
0.20 – 0.70 mm
(0.0079 – 0.0276 in)
EAS00265

CHECKING THE PISTON PIN

1. Check:
9piston pin
Blue discoloration/grooves → Replace the
piston pin and then check the lubrication
system.
2. Measure:
9piston pin outside diameter a
Out of specification → Replace the piston
pin.
Piston pin outside diameter
12.996 – 13.000 mm
(0.5117 – 0.5118 in)
<Limit>: 12.976 mm (0.5109 in)
3. Measure:
9piston pin bore diameter (of the piston) b
Out of specification → Replace the piston.
Piston pin bore diameter (of the
piston)
13.002 – 13.013 mm
(0.5119 – 0.5123 in)
<Limit>: 13.043 mm (0.5135 in)
4-35
ENG