Yamaha YZ125(R)/LC, Owner'S Service Manual

Page: 260 / 568

4-24
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474700
Combination of piston and cylinder
1. Check:
9
Cylinder mark
a
2. Check:
9 Piston mark
a
3. Combination:
Combine the piston and cylinder by the fol-
lowing chart.
NOTE:
When you purchase a cylinder, you cannot des-
ignate its size. Choose the piston that matches
the above chart.
Piston clearance:
Standard <Limit>
0.040~0.045 mm 0.1 mm
(0.0016~0.0018 in) (0.004 in)
Cylinder mark
a a
Cylinder size
A
54.000~54.002 mm
(2.1260~2.1261 in)
B
54.004~54.006 mm
(2.1261~2.1262 in)
C
54.008~54.010 mm
(2.1263~2.1264 in)
D
54.012~54.014 mm
(2.1265~2.1265 in)
Piston mark
a a
(color) Piston size
A (red)
53.957~53.960 mm
(2.1243~2.1244 in)
B (orange)
53.961~53.964 mm
(2.1244~2.1246 in)
C (green)
53.965~53.968 mm
(2.1246~2.1247 in)
D (purple)
53.969~53.972 mm
(2.1248~2.1249 in)
Cylinder mark Piston mark (color)
A A (red)
B B (orange)
C C (green)
D D (purple)