HYOSUNG RX 125 Service Manual page 49

3-19 ENGINE
OVERSIZE RINGS
● Oversize piston rings
The following two types of oversize piston rings are
used. They bear the following identification numbers.
Oversize piston ring
0.5 mm
1.0 mm
● Oversize oil rings
The following two types of oversize oil ring are
used. They bear the following identification marks.
Oversize oil ring
0.5 mm
1.0 mm
● Oversize side rail
Just measure outside diameter to identify the side
rail as there is no mark or numbers on it.
PISTON PIN-PIN BORE
Using a caliper gauge, measure the piston pin bore
inside diameter, and using a micrometer measure
the piston pin outside diameter. If the difference
between these two measurements is more than the
limits, replace both piston and piston pin.
Micrometer (0~25 mm) : 09900-20205
Piston pin bore
Piston pin bore
Piston pin O.D.
Piston pin O.D.
CONROD SMALL END I.D.
Using a caliper gauge, measure the conrod small
end inside diameter.
Conrod small end I.D.
● If the conrod small end bore inside diameter
exceeds the limit, replace conrod.
1st 2nd
50 50
100 100
Color classification
Painted red
Painted yellow
Service limit 15.030 mm
Service limit 14.980 mm
Service limit 15.040 mm