Yamaha TT-R125LW, Owner'S Service Manual

Page: 254 / 468

4 - 35
ENG
CYLINDER AND PISTON
●
If out of specification, replace the cylinder,
and replace the piston and piston rings as
a set.
Piston pin
1. Inspect:
●
Piston pin
Blue discoloration/grooves
→
Replace,
then inspect the lubrication system.
2. Measure:
●
Piston pin-to-piston clearance
Measurement steps:
●
Measure the piston pin outside diameter
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
.
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)