Suzuki DF 2.5 Service Manual page 91

Piston ring to groove clearance
Before checking, the piston grooves must be clean, dry and free
of carbon.
Fit the piston ring into the piston groove, and measure the clear-
ance between the ring and the ring groove using the thickness
gauge.
 09900-20803: Thickness gauge
Piston ring to groove clearance:
Standard:
1st & 2nd 0.020 – 0.060 mm (0.0008 – 0.0024 in)
Service limit:
1st & 2nd 0.120 mm (0.0047 in)
If the measurement exceeds the service limits, replace the pis-
ton and/or the piston ring.
Piston ring groove width:
Standard:
1st & 2nd 1.21 – 1.23 mm (0.048 – 0.049 in)
Oil 1.51 – 1.53 mm (0.059 – 0.060 in)
Piston ring thickness:
Standard:
1st & 2nd 1.17 – 1.19 mm (0.046 – 0.047 in)
Piston ring end gap
Measure the piston ring end gap with the piston ring in the low-
est position of the cylinder bore.
 09900-20803: Thickness gauge
Piston ring end gap:
Standard:
1st & 2nd 0.15 – 0.35 mm (0.006 – 0.014 in)
Service limit:
1st & 2nd 0.50 mm (0.020 in)
If the measurement exceeds the service limit, replace the posi-
tion ring.
POWER UNIT 6-25
Piston ring
1st ring
2nd ring
Piston ring