Yamaha T135SE, Service Manual

Page: 28 / 349

SPEC
2-6
MAINTENANCE SPECIFICATIONS
Item Standard Limit
Valve spring
Free length IN/EX 47.33 mm (1.86 in) 44.96 mm
(1.77 in)
Installed length (valve closed) IN/EX 35.30 mm (1.39 in) ----
Compressed spring force IN/EX 135.6 – 156.0 N (13.8 – 15.8 kgf) ----
at 35.3 mm (1.39 in)
Tilt limit “*” IN/EX ---- 2.0 mm
(0.08 in)
Winding direction IN/EX Clockwise ----
Piston
Piston-to-cylinder clearance 0.015 – 0.048 mm (0.0006 – 0.0019 in) 0.150 mm
(0.0059 in)
Piston size “D” 53.962 – 53.985 mm (2.1245 – 2.1254 in) ----
Measuring point “H” 5.0 mm (0.1969 in) ----
Offset 0.25 mm (0.0098 in) ----
Offset direction Intake side ----
Piston pin bore inside diameter 14.002 – 14.013 mm (0.5513– 0.5517 in) 14.043 mm
(0.5529 in)
Piston pin outside diameter 13.995 – 14.000 mm (0.5510– 0.5512 in) 13.975 mm
(0.5502 in)
Piston rings
Top ring
Ring type Barrel ----
Dimensions (B
⋅
T) 0.80
⋅
1.90 mm (0.03
⋅
0.07 in) ----
End gap (installed) 0.10 – 0.25 mm (0.0098 in) (0.00-0.01 in) 0.40 mm
(0.0157 in)
Ring side clearance (installed) 0.030 – 0.065 mm (0.0012-0.0026 in) 0.10 mm
(0.0039 in)
2nd ring
Ring type Taper ----
Dimensions (B
⋅
T) 0.80
⋅
2.15 mm (0.03
⋅
0.08 in) ----
End gap (installed) 0.10 – 0.25 mm (0.0098 in) (0.00-0.01 in) 0.40 mm
(0.0157 in)
Ring side clearance 0.020 – 0.055 mm (0.0008-0.0022 in) 0.10 mm
(0.0039 in)
Oil ring
Dimensions (B
⋅
T) 1.50
⋅
1.95 mm (0.06
⋅
0.08 in) ----
End gap (installed of oil ring rails) 0.20 – 0.70 mm (0.01 – 0.03 in) ----
T
B
B
T
B
T
H
D
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