Yamaha SR125 1997, Service Manual

Page: 25 / 243

2-5
MAINTENANCE SPECIFICATIONS
SPEC
Item Standard Limit
Guide inside diameter IN
EX
Stem-to-guide clearance IN
EX
Stem runout limit
Valve seat width
IN
EX
6.000
X
6.012 mm
6.000
X
6.012 mm
0.010
X
0.037 mm
0.025
X
0.052 mm
SSS
0.9
X
1.1 mm
0.9
X
1.1 mm
6.042 mm
6.042 mm
0.08 mm
0.10 mm
0.03 mm
1.6 mm
1.6 mm
Valve spring:
Free length (inner) IN / EX
(outer) IN / EX
Set length (valve closed)
(inner) IN / EX
(outer) IN / EX
Compressed pressure
(inner) IN / EX
(outer) IN / EX
Tilt limit (inner) IN / EX
Tilt limit (outer) IN / EX
Direction of winding (inner) IN / EX
Direction of winding (outer) IN / EX
35.5 mm
37.2 mm
22.5 mm
24.0 mm
26.7
X
30.7 kg
52.4
X
40.2 kg
SSS
SSS
Clockwise
Counterclockwise
33.5 mm
35.2 mm
SSS
SSS
SSS
SSS
2.5
_
/1.5 mm
2.5
_
/1.5 mm
SSS
SSS
Piston:
Piston to cylinder
clearance
Piston size “D”
Piston over size (1st)
Piston over size (2nd)
Measuring point “H”
Piston off-set
Piston off-set direction
Piston pin bore
inside diameter
Piston pin outside diameter 0.025
X
0.045 mm
56.960
X
56.975 mm
57.25 mm
57.50 mm
7.0 mm
0.5 mm
IN side
15.002
X
15.013 mm
14.978
X
14.992 mm
SSS
SSS
SSS
SSS
SSS
SSS
SSS
15.045 mm
14.975 mm
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)
Plane
2.3
2.5 mm
0.15
X
0.35 mm
0.03
X
0.07 mm
Plane
2.3
2.5 mm
0.15
X
0.35 mm
0.02
X
0.06 mm
2.5 2.8 mm
0.3
X
0.9 mm
SSS
SSS
0.60 mm
0.15 mm
SSS
SSS
0.60 mm
0.15 mm
SSS
SSS