KYMCO Super 8 50, Service Manual, Page: 99 / 185

8
. CYLINDER/PISTON
8-4
Super 8 50
Measure the piston pin O.D.
Service Limit : 12.96mm replace if below
Measure the piston O.D.
Service Limit : 38.9mm replace if below
Measure the piston-to-piston pin clearance.
Service Limit : 0.02mm replace if over
CYLINDER INSPECTION
Inspect the cylinder bore for wear 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 : 39.10mm repair or replace if
over
Measure the cylinder-to-piston clearance.
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) 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
Middle
Bottom
Top
Take measurement at 9mm from the
bottom and 90

to the piston pin hole.
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