Yamaha TT-R50E Owner's Service Manual page 62

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)
2nd ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance
MAINTENANCE SPECIFICATIONS
Item
H
D
T
T
Standard
0.030 ~ 0.040 mm
(0.0012 ~ 0.0016 in)
35.960 ~ 35.980 mm
(1.4157 ~ 1.4165 in)
5 mm (0.20 in)
0.50 mm (0.0197 in)
Intake side
12.002 ~ 12.013 mm
(0.4725 ~ 0.4730 in)
11.996 ~ 12.000 mm
(0.4723 ~ 0.4724 in)
B
Barrel
0.80 × 1.60 mm
(0.031 × 0.063 in)
0.10 ~ 0.25 mm
(0.004 ~ 0.010 in)
0.020 ~ 0.070 mm
(0.0008 ~ 0.0028 in)
B
Taper
0.80 × 1.60 mm
(0.031 × 0.063 in)
0.15 ~ 0.30 mm
(0.006 ~ 0.012 in)
0.020 ~ 0.060 mm
(0.0008 ~ 0.0024 in)
2 - 7
SPEC
Limit
0.15 mm
(0.0059 in)
----
----
----
----
12.043 mm
(0.4741 in)
11.976 mm
(0.4715 in)
----
----
0.50 mm
(0.020 in)
0.12 mm
(0.0047 in)
----
----
0.65 mm
(0.026 in)
0.12 mm
(0.0047 in)