Checking The Piston Pin - Yamaha XC50V 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
9.996 ~ 10.000 mm (0.3935 ~
a
0.3937 in)
<Limit>:9.976 mm (0.3928 in)
3. Measure:
8 piston pin bore diameter b
Out of specification
Piston pin bore diameter
10.002 ~ 10.013 mm (0.3938 ~
0.3942 in)
<Limit>:10.043 mm (0.3954 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
0.002 ~ 0.017 mm (0.0001 ~ 0.0007
in)
5-31
ENG
Replace the
Replace the pis-
Replace the piston.
Replace the pis-