Suzuki GZ250 Service Manual page 72

3-35 ENGINE
PISTON RING-GROOVE CLEARANCE
Measure the side clearance of the 1st and 2nd rings using
the thickness gauge If any of the clearances exceed the
limit, replace both the piston and piston rings.
09900-20803: Thickness gauge 09900-
20205: Micrometer (0-25 mm)
Service Limit
Piston ring-groove clearance
Standard
Piston ring groove width
Standard
Piston ring thickness
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 cali pers.
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.
09900-20101: Vernier calipers
Service Limit
Piston ring free end gap
09900-20803: Thickness gauge
Service Limit
Piston ring end gap (1st and 2nd): 0.50 mm (0.020 in)
1st: 0.180 mm
(0.0071 in)
2nd: 0.150 mm
(0.0059 in)
1st: 1.01-1.03
(0.040-0.041 in)
2nd: 1. 21-1.23
(0.047-0.048 in)
Oil: 2.51-2.53
(0.099-0.100 in)
1st: 0.975-0.990
(0.0384-0.0390 in)
2nd: 1.170-1.190
(0.0461-0.0469 in)
1st: 7.6 mm (0.30 in)
2nd: 8.8 mm (0.35 in)
mm
mm
mm
mm
mm