KYMCO ZING 150 - Cylinder Inspection

7. CYLINDER/PISTON
7
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4
Measure the piston pin O.D.
Service Limit: 14.99mm replace if below
Measure the piston O.D.
Service Limit:
150cc: 61.8mm replace if below
125cc: 56.35mm replace if below
CYLINDER INSPECTION
Inspect the cylinder bore for wear, scratches
or damage.
Measure the cylinder I.D. at three levels of
top, middle and bottom at 90° to the piston
pin (in both X and Y directions).
Service Limit: 150cc: 62.1mm replace if over
125cc: 56.6mm replace if over
Measure the cylinder-to-piston clearance and
take the maximum figure measured.
Service Limit: 0.1mm repair or replace if
over
The true roundness is the difference between
the values measured in X and Y directions.
The cylindricity (difference between the
values measured at the three levels in X or Y
directions) is subject to the maximum value
calculated.
Service Limits:
True Roundness: 0.05mm repair or replace
if over
Cylindricity: 0.05mm repair or replace if over
Take measurement at 10mm from the
bottom and 90° to the piston pin hole.
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Middle
Top
Bottom
Top
Middle
Bottom