Checking The Piston Pin - Yamaha YJ125S Service Manual

b
CYLINDER AND PISTON
EAS00265

CHECKING THE PISTON PIN

1. Check:
8 piston pin
Blue discoloration/grooves
piston pin and then check the lubrication
system.
2. Measure:
8 piston pin outside diameter a
Out of specification
ton pin.
Piston pin outside diameter
12.996 ~ 13.000 mm
a
(0.5117~0.5118 in)
<Limit>:12.976 mm (0.5109 in)
3. Measure:
8 piston pin bore diameter b
Out of specification
Piston pin bore diameter
13.002 ~ 13.013 mm
(0.5119 ~ 0.5123 in)
<Limit>:13.043 mm (0.5135 in)
4. Calculate:
8 piston-pin-to-piston-pin-bore clearance
Out of specification
ton pin and piston as a set.
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter b -
Piston pin outside diameter a
Piston-pin-to-piston clearance
<Limit>:0.067 mm(0.0026 in)
5-32
ENG
Replace the
Replace the pis-
Replace the piston.
Replace the pis-