Piston And Piston Ring Inspection - Suzuki RM250 Owner's Service Manual

6·4 CYLINDER, PISTON AND EXHAUST VALVE
• Inspect for cylinder distortion .
Service limit : 0 .05 mm (0.002 in)
• Measure the cylinder bore for wear w ith a cylinder gauge
20 mm from the t op su rface.
NOTE: The cylinder bore must be measured perpendicular
to the crankshaft axis direction.
Standard : 67.000 - 67 .015 mm 12.6378 -2.6384 inl
09900·20508 Cylinder gauge set 140 - 80 mml
• Disconnect the exha ust valve breather hose and fil ter.
• Remove ca rbon deposits from the filter and clean it .
PISTON AND PISTON RING INSPECTION
• Remove the piston ring from t he piston ring groove.
• Remove carbon deposits from the piston.
• Inspect the piston for wear, sc ratches and damage.
• Measure the piston outer diameter 24 mm 10.94 in) from
the skirt end .
Service limit : 66 .950 mm (2 .6381 in)
09900·20203 Micrometer 150 - 75 mml
• Measure the piston pin bore and piston pin diameter .
Pi ston pin bore
Piston pin 0 .0 .
09900 -20605 Dial gauge
09900-20205 Micrometer
Service limit
18.030 mm 10 .7098 in)
17 .980 mm 10 .6724 in)
~~
20
mm
24
mm
(0.94 in )