HYOSUNG 2010 ST7 Service Manual page 277

9-21 SERVICING INFORMATION
CYLINDER + PISTON + PISTON RING
ITEM
Compression pressure
Piston to cylinder clearance
Cylinder bore
Piston diam.
Cylinder or cylinder head distortion
Piston ring free end gap
Piston ring end gap (Assembly condition)
Piston ring to groove clearance
Piston ring groove width
Piston ring thickness
Piston pin hole bore
Piston pin O.D.
STANDARD
2
14 kgf/cm (at 500 rpm)
0.045 ~ 0.075 (0.0018 ~ 0.0030)
81.500 ~ 81.515 (3.2087 ~ 3.2093)
81.440 ~ 81.455 (3.2063 ~ 3.2069)
[Measure at 20 mm (0.79 in) from the skirt end]
1st Approx 9.9 (0.390)
2nd Approx 10.5 (0.413)
1st 0.20 ~ 0.35 (0.008 ~ 0.013)
2nd 0.20 ~ 0.35 (0.008 ~ 0.013)
1st
2nd
1st 1.21 ~ 1.23 (0.0476 ~ 0.0484)
2nd 1.01 ~ 1.03 (0.040 ~ 0.041)
Oil 2.01 ~ 2.03 (0.079 ~ 0.080)
1st 0.970 ~ 0.990 (0.0382 ~ 0.0390)
2nd 1.170 ~ 1.190 (0.0461 ~ 0.0469)
20.002 ~ 20.008 (0.7875 ~ 0.7877)
19.996 ~ 20.000 (0.7872 ~ 0.7874)
Unit : mm (in)
LIMIT
2
12 kgf/cm
0.120 (0.0047)
81.575 (3.2116)
81.380 (3.2039)
0.05 (0.002)
7.9 (0.311)
8.4 (0.330)
0.5 (0.020)
0.7 (0.028)
0.180 (0.007)
0.150 (0.006)
20.030 (0.7886)
19.980 (0.7866)