Yamaha 5KM2-AE1 Service Manual page 39

Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Piston off-set
Offset direction
Piston pin bore inside diameter
Piston pin outside diameter
Piston rings:
Top ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
MAINTENANCE SPECIFICATIONS
Item
H
D
T
Standard
0.05 ~ 0.07 mm
(0.0020 ~ 0.0028 in)
99.945 ~ 99.995 mm
(3.9348 ~ 3.9368 in)
2.5 mm (0.10 in)
1.0 mm (0.0394 in)
Intake side
22.004 ~ 22.015 mm
(0.8663 ~ 0.8667 in)
21.991 ~ 22.000 mm
(0.8658 ~ 0.8661 in)
B
Barrel
1.2 × 3.8 mm
(0.0472 × 0.1496 in)
0.30 ~ 0.45 mm
(0.0118 ~ 0.0177 in)
0.04 ~ 0.08 mm
(0.0016 ~ 0.0031 in)
2 - 7
SPEC
Limit
0.15 mm
(0.0059 in)
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22.045 mm
(0.8679 in)
21.971 mm
(0.8650 in)
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0.70 mm
(0.0276 in)
0.13 mm
(0.0051 in)