Suzuki DR 125, Service Manual

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3-32 ENGINE
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Piston ring groove width
Standard 1st : 1.21 – 1.23 mm (0.047 – 0.048 in)
2nd : 1.21 – 1.23 mm (0.047 – 0.048 in)
Oil : 2.51 – 2.53 mm (0.099 – 0.110 in)
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Piston ring thickness
Standard 1st : 1.175 – 1.190 mm (0.0463 – 0.0469 in)
2nd : 1.170 – 1.190 mm (0.0461 – 0.0469 in)
NOTE:
Remove any carbon from the piston crown and ring grooves
using a soft-metal scraper.
PISTON RING FREE END GAP AND PISTON RING END GAP
Measure the piston ring free end gap using a vernier calipers.
Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using a thickness gauge.
If the piston ring’s end gap is out of specification, replace the
piston ring.
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Piston ring free end gap
Service Limit 1st : 5.6 mm (0.22 in)
2nd : 6.8 mm (0.27 in)
&
09900-20101: Venier calipers
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Piston ring end gap
Service Limit 1st and 2nd: 0.5 mm (0.02 in)
&
09900-20803: Thickness gauge