Yamaha 2006 XF50W, Service Manual

Page: 193 / 338

CYLINDER AND PISTON
ENG
% m
EAS00265
CHECKING THE PISTON PIN
1. Check:
• piston pin
Blue discoloration/grooves -* Replace the
piston pin and then check the lubrication
system.
2. Measure:
• piston pin outside diameter a
Out of specification -* Replace the pis-
ton pin.
Piston pin outside diameter
9.996 ~ 10.000 mm (0.3935 ~
0.3937 in)
<Limit>:9.976 mm (0.3928 in)
3. Measure:
• piston pin bore diameter b
Out of specification^ Replace the piston.
Piston pin bore diameter
10.002 ~ 10.013 mm (0.3938 ~
0.3942 in)
<Limit>:10.043 mm (0.3954 in)
4. Calculate:
• piston-pin-to-piston-pin-bore clearance
Out of specification -* Replace the pis-
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)
5-36
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