Suzuki drz 400E Service Manual page 76

3-34 ENGINE
PISTON-RING-TO-GROOVE CLEARANCE
Measure the side clearances of the 1st and 2nd piston rings
using the thickness gauge. If any clearance reading exceeds the
service limit, replace both the piston and piston rings.
09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
Piston-ring-to-groove clearance
Service Limit:
1st: 0.18 mm (0.0071 in)
2nd: 0.15 mm (0.0059 in)
Piston ring groove width
Standard:
1st: 0.78 – 0.80 mm (0.0307 – 0.0315 in)
1.30 – 1.32 mm (0.0512 – 0.0520 in)
2nd: 0.81 – 0.83 mm (0.0319 – 0.0327 in)
Oil: 2.01 – 2.03 mm (0.0791 – 0.0799 in)
Piston ring thickness
Standard:
1st: 0.71 – 0.76 mm (0.0280 – 0.0299 in)
1.08 – 1.10 mm (0.0425 – 0.0433 in)
2nd: 0.77 – 0.79 mm (0.0303 – 0.0311 in)
PISTON RING FREE END GAP AND PISTON RING END GAP
Measure the piston ring free end gap using the vernier calipers,
first, and then fit the piston ring squarely into the cylinder and
measure the piston ring end gap using the thickness gauge.
If any measurement exceeds the service limit, replace the pis-
ton ring with a new one.
09900-20101: Vernier calipers
Piston ring free end gap
Service Limit:
1st: 5.5 mm (0.22 in)
2nd: 9.2 mm (0.36 in)
09900-20803: Thickness gauge
Piston ring end gap
Service Limit:
1st: 0.50 mm (0.020 in)
2nd: 0.50 mm (0.020 in)