8. CYLINDER/PISTON
8-5
Mongoose/KXR 250
INSPECTION
Inspect the piston, piston pin and piston
rings.
Remove the piston rings.
Clean carbon deposits from the piston ring
grooves.
Inspect the piston wall for
wear/scratches/damage.
If any defects are found, replace the piston
with a new one.
Install the piston rings onto the piston and
measure the piston ring-to-groove clearance.
Service Limits: Top: 0.09mm replace if
over
2nd: 0.09mm replace if
over
Remove the piston rings and insert each
piston ring into the cylinder bottom.
Measure the piston ring end gap.
Service Limit: Top: 0.5mm replace if over
2nd: 0.65mm replace if over
Oil ring: 0.9mm replace if
over
Measure the piston pin hole I.D.
Service Limit: 17.04mm replace if over
Take care not to damage or break the
piston rings during removal.
＊
Use the piston head to push each piston
ring into the cylinder.
＊
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