KYMCO Mongoose/KXR 250 Service Manual page 104

8
. CYLINDER/PISTON
INSPECTION
Inspect the piston, piston pin and piston
rings.
Remove the piston rings.
Take care not to damage or break the
piston rings during removal.
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
2nd: 0.09mm replace if
Remove the piston rings and insert each
piston ring into the cylinder bottom.
Use the piston head to push each piston
ring into the cylinder.
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
Measure the piston pin hole I.D.
Service Limit: 17.04mm replace if over
8-5
over
over
over
Mongoose/KXR 250