HYOSUNG MS3 250 Sercie Manual page 70

3-27 ENGINE
▣ ▣ PISTON RING-TO-GROOVE CLEAR-
ANCE INSPECTION
Remove carbon deposit both from the piston ring and
its groove.
Fit the piston ring into the groove. With the ring com-
pressed and lifted up, measure the clearance on the
bottom side of the ring using a thickness gauge.
If any clearance reading exceeds the service limt,
replace both the piston and piston rings.
Piston ring-groove clearance
1st
2nd
Piston ring groove width
1st
2nd
Oil
Piston ring thickness
1st
2nd
Micrometer(0~25 mm) : 09900-20201
Thickness gauge : 09900-20806
Service limit
0.180 mm (0.007 in)
0.150 mm (0.006 in)
Standard
1.01 ~ 1.03 mm
(0.040 ~ 0.041 in)
1.01 ~ 1.03 mm
(0.040 ~ 0.041 in)
2.01 ~ 2.03 mm
(0.079 ~ 0.080 in)
Standard Standard
0.970 ~ 0.990 mm
(0.0382 ~ 0.0390 in)
0.970 ~ 0.990 mm
(0.0382 ~ 0.0390 in)