Yamaha TT-R90(R), Инструкция по эксплуатации, Страница: 89 / 132

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ENG
CYLINDER AND PISTON
Piston pin
1. Inspect:
●
Piston pin
Blue discoloration/grooves
→
Replace, then inspect the lubrication
system.
2. Measure:
●
Piston pin outside diameter
●
Piston pin bore inside diameter
ASSEMBLY AND INSTALLATION
Piston
1. Install:
●
Piston rings
(onto the piston)
NOTE:
●
Be sure to install the piston rings so that the
manufacturer’s marks or numbers are
located on the upper side of the rings.
●
Lubricate the piston and piston rings liberally
with engine oil.
Measurement steps:
●
Measure the piston pin outside diameter
a
.
If out of specification, replace the piston
pin
Outside diameter (piston pin):
12.996 ~ 13.000 mm
(0.5117 ~ 0.5118 in)
<Limit>:12.976 mm (0.5109 in)
●
Measure the piston inside diameter
b
.
If out of specification, replace the piston.
Inside diameter (piston):
13.002 ~ 13.013 mm
(0.5119 ~ 0.5123 in)
<Limit>: 13.045 mm (0.5136 in)