Piston Ring Groove Width; Piston Ring Thickness - Suzuki GW250 Service Manual

3-38 ENGINE
PISTON PIN AND PIN BORE
• Measure the piston pin bore diameter using the small bore
gauge.
• If the measurement is out of specification, replace the piston.
 Piston pin bore I.D.:
Service Limit: 15.030 mm (0.5917 in)
 09900-20602: Dial gauge
09900-22401: Small bore gauge (10 – 18 mm)
• Measure the piston pin outside diameter at three positions
using the micrometer.
• If any of the measurements is out of specification, replace the
piston pin.
 Piston pin O.D.:
Service Limit: 14.980 mm (0.5898 in)
 09900-20205: Micrometer (0 – 25 mm)
PISTON RING-TO-GROOVE CLEARANCE
• Measure the side clearances of the 1st and 2nd piston rings
using the thickness gauge.
• If any of the clearances exceeds the 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) : 0.180 mm (0.0071 in)
(2nd) : 0.150 mm (0.0059 in)
 Piston ring groove width:
Standard (1st) : 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(2nd) : 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(Oil) : 2.01 – 2.03 mm (0.0791 – 0.0799 in)
 Piston ring thickness:
Standard (1st) : 0.97 – 0.99 mm (0.0382 – 0.0390 in)
(2nd) : 0.97 – 0.99 mm (0.0382 – 0.0390 in)