Suzuki DR 125, Service Manual

Page: 183 / 222

SERVICING INFORMATION 7-25
CY PISTON RING
Unit: mm (in)
ITEM STANDARD LIMIT
Compression pressure
1 200 – 1 600 kPa
(12 – 16 kgf/cm
2
, 171 – 228 psi)
1 000 kPa
(10 kgf/cm
2
,
142 psi)
Piston-to-cylinder clearance 0.020 – 0.030
(0.0008 – 0.0012)
0.120
(0.0047)
Cylinder bore 57.000 – 57.015
(2.2440 – 2.2447)
57.110
(2.2484)
Piston diam. 56.975 – 56.990
(2.2431 – 2.2437)
Measure at 12 mm (0.5 in) from the skirt end.
56.880
(2.2394)
Cylinder distortion
—
0.05
(0.002)
Piston ring free end gap
1st R Approx.
7.0
(0.28) 5.6
(0.22)
2nd R Approx.
8.5
(0.33) 6.8
(0.27)
Piston ring end gap
1st
0.10 – 0.25
(0.004 – 0.010)
0.5
(0.02)
2nd
0.10 – 0.25
(0.004 – 0.010)
0.5
(0.02)
Piston ring to groove clearance
1st —
0.18
(0.007)
2nd —
0.15
(0.006)
Piston ring groove width
1st
1.21 – 1.23
(0.047 – 0.048)
—
2nd
1.21 – 1.23
(0.047 – 0.048)
—
Oil
2.51 – 2.53
(0.099 – 0.100)
—
Piston ring thickness
1st
1.175 – 1.190
(0.0463 – 0.0469)
—
2nd
1.170 – 1.190
(0.0461 – 0.0469)
—
Piston pin bore 14.002 – 14.008
(0.5513 – 0.5515)
14.030
(0.5524)
Piston pin O.D. 13.994 – 14.002
(0.5509 – 0.5513)
13.980
(0.5504)