Yamaha YJ125S Service Manual page 22

Piston
Piston-to-cylinder clearance
Diameter D
Height H
Piston pin bore (in the piston)
Diameter
Offset
Offset direction
Piston pin
Outside diameter
Piston rings
Top ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
2nd ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
Oil ring
Dimensions (B × T)
End gap (installed)
Ring side clearance
ENGINE SPECIFICATIONS
Item
D
T
T
T
Standard
0.010~0.030 mm
51.470~51.510 mm
H
3.5 mm
13.002~13.013 mm
0.35~0.65mm
Intake side
12.996~13.000 mm
B
Barrel
1.0 × 2.1mm
0.10~0.20 mm
0.02~0.08 mm
B
Plain
1.0 × 2.1mm
0.20~0.30 mm
0.02~0.06 mm
B
2.0 × 2.2 mm
0.2~0.7 mm
0.06~0.15 mm
2-7
SPEC
Limit
0.150mm
...
...
13.043 mm
...
...
12.976 mm
...
...
0.45mm
0.13 mm
...
...
0.65mm
0.12mm
...
...
...