Yamaha TT-R125(S), Owner'S Service Manual

Page: 83 / 610

SPEC
2 - 10
MAINTENANCE SPECIFICATIONS
Piston:
Piston to cylinder clearance 0.020 ~ 0.026 mm
(0.0008 ~ 0.0010 in) 0.15 mm
(0.0059 in)
Piston size “D” 53.977 ~ 53.996 mm
(2.1251 ~ 2.1258 in) ----
Piston over size (2nd) 54.5 mm (2.1457 in) ----
(4th) 55.0 mm (2.1654 in) ----
Measuring point “H” 5 mm (0.20 in) ----
Piston off-set 0.5 mm (0.0197 in) ----
Piston pin bore inside diameter 15.002 ~ 15.013 mm
(0.5906 ~ 0.5911 in) 15.043 mm
(0.5922 in)
Piston pin outside diameter 14.991 ~ 15.000 mm
(0.5902 ~ 0.5906 in) 14.971 mm
(0.5894 in)
Piston rings:
Top ring
Type Barrel ----
Dimensions (B
×
T) 1.0
×
2.1 mm (0.04
×
0.08 in) ----
End gap (installed) 0.15 ~ 0.30 mm
(0.006 ~ 0.012 in) 0.4 mm
(0.016 in)
Side clearance (installed) 0.035 ~ 0.090 mm
(0.0014 ~ 0.0035 in) 0.12 mm
(0.0047 in)
2nd ring
Type Taper ----
Dimensions (B
×
T) 1.0
×
2.1 mm (0.04
×
0.08 in) ----
End gap (installed) 0.30 ~ 0.45 mm
(0.012 ~ 0.018 in) 0.55 mm
(0.022 in)
Side clearance 0.020 ~ 0.060 mm
(0.0008 ~ 0.0024 in) 0.12 mm
(0.0047 in)
Oil ring
Dimensions (B
×
T) 2.0
×
2.2 mm (0.08
×
0.09 in) ----
End gap (installed) 0.20 ~ 0.70 mm (0.01 ~ 0.03 in) ----
Item Standard Limit
H
D
T
B
B
T
B
T