Yamaha TT-R90(R), Instruction Manual

Page: 34 / 132

SPEC
2 - 7
Piston:
Piston to cylinder clearance 0.025 ~ 0.045 mm
(0.0010 ~ 0.0018 in) 0.15 mm
(0.0059 in)
Piston size “D” 46.960 ~ 46.975 mm
(1.8488 ~ 1.8494 in) ----
Piston over size (2nd) 47.5 mm (1.8701 in) ----
(4th) 48.0 mm (1.8898 in) ----
Measuring point “H” 4 mm (0.16 in) ----
Piston off-set 0.75 mm (0.0295 in) ----
Piston pin bore inside diameter 13.002 ~ 13.013 mm
(0.5119 ~ 0.5123 in) 13.045 mm
(0.5136 in)
Piston pin outside diameter 12.996 ~ 13.000 mm
(0.5117 ~ 0.5118 in) 12.976 mm
(0.5109 in)
Piston rings:
Top ring
Type Barrel ----
Dimensions (B
×
T) 1.0
×
2.0 mm (0.04
×
0.08 in) ----
End gap (installed) 0.10 ~ 0.25 mm
(0.004 ~ 0.010 in) 0.4 mm
(0.016 in)
Side clearance (installed) 0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in) 0.12 mm
(0.005 in)
2nd ring
Type Taper ----
Dimensions (B
×
T) 1.0
×
2.0 mm (0.04
×
0.08 in) ----
End gap (installed) 0.10 ~ 0.25 mm
(0.004 ~ 0.010 in) 0.4 mm
(0.016 in)
Side clearance 0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in) 0.12 mm
(0.005 in)
Oil ring
Dimensions (B
×
T) 2.0
×
2.3 mm (0.08
×
0.09 in) ----
End gap (installed) 0.2 ~ 0.7 mm (0.01 ~ 0.03 in) ----
Item Standard Limit
H
D
T
B
B
T
B
T
MAINTENANCE SPECIFICATIONS