Yamaha MIO Service Manual page 26

Item
Piston
Piston-to-cylinder clearance
Diameter D
Height H
Piston pin bore (in the piston)
Diameter
Offset
Offset direction
Piston pin
Outside diameter
Piston-pin-to-piston-pin-bore clear-
ance
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
ENGINE SPECIFICATIONS
0.020 ~ 0.035 mm (0.0008 ~ 0.0014 in)
49.970 ~ 49.985 mm (1.9673 ~ 1.9679 in)
H
D
5 mm (0.20 in)
15.002 ~ 15.013 mm (0.5906 ~ 0.5911 in) 15.043 mm
0.5 mm (0.020 in)
Intake side
14.995 ~ 15.000 mm (0.5904 ~ 0.5906 in) 14.975 mm
0.002 ~ 0.018 mm (0.0001 ~ 0.0007 in)
B
T
Barrel
1.00 × 1.95 mm (0.039 × 0.077 in)
0.10 ~ 0.25 mm (0.004 ~ 0.010 in)
0.03 ~ 0.07 mm (0.0012 ~ 0.0028 in)
B
T
Taper
1.0 × 2.0 mm (0.039 × 0.079 in)
0.10 ~ 0.25 mm (0.004 ~ 0.010 in)
0.02 ~ 0.06 mm (0.0008 ~ 0.0024 in)
Standard
2 - 6
SPEC
Limit
0.150 mm
(0.0059 in)
----
----
(0.5922 in)
----
----
(0.5896 in)
0.068 mm
(0.0027 in)
----
----
0.50 mm
(0.020 in)
0.12 mm
(0.0047 in)
----
----
0.60 mm
(0.024 in)
0.12 mm
(0.0047 in)