Piston; Piston Rings - Yamaha TT-R90(P) Owner's Service Manual

Piston:

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