Suzuki DF9,9 Service Manual page 148

6-28 POWER UNIT
Identification of oversize piston/piston ring
Piston
Oversize
0.50 mm (0.020 in)
1st & 2nd ring
Oversize
0.50 mm (0.020 in)
Oil ring
Oversize
0.50 mm (0.020 in)
NOTE:
For the oil ring side rail, measure the outer diameter of the rail to
distinguish because there is no I.D. mark.
Piston ring to groove clearance
Measure the clearance after decarboning.
 09900-20803: Thickness gauge
Standard: 1st & 2nd 0.02 – 0.06 mm (0.001 – 0.002 in)
Service limit: 1st & 2nd 0.10 mm (0.004 in)
If measurement exceeds service limit, replace the piston and/or
piston ring.
 09900-20102: Vernier calipers
09900-20205: Micrometer
Piston ring groove width
Standard:
1st & 2nd 1.21 – 1.23 mm (0.0476 – 0.0484 in)
Oil 2.51 – 2.53 mm (0.099 – 0.100 in)
Piston ring thickness
Standard: 1st & 2nd 1.17 – 1.19 mm (0.046 – 0.047 in)
I.D. mark
50
I.D. mark
50
I.D. mark
Red paint
I.D. mark
1st, 2nd ring
I.D. mark
Oil ring spacer
I.D. mark