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Yamaha TT-R125ER Manuel D'atelier Du Proprietaire page 314

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CYLINDER AND PISTON
If out of specification, replace the cylinder,
G
and replace the piston and piston rings as
a set.
Piston pin
1. Inspect:
Piston pin
G
Blue discoloration/grooves → Replace,
then inspect the lubrication system.
2. Measure:
Piston pin-to-piston clearance
G
Measurement steps:
Measure the piston pin outside diameter
G
a.
If out of specification, replace the piston
pin.
Outside diameter (piston pin):
14.991 ~ 15.000 mm
(0.5902 ~ 0.5906 in)
<Limit>: 14.971 mm (0.5894 in)
Measure the piston inside diameter b.
G
If out of specification, replace the piston.
Inside diameter (piston):
15.002 ~ 15.013 mm
(0.5906 ~ 0.5911 in)
<Limit>: 15.043 mm (0.5922 in)
4 - 35
ENG

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