KYMCO ZX Service Manual page 65

6
. CYLINDER HEAD/CYLINDER/PISTON
Measure each piston ring end gap.
Service Limits: Top/Second
0.40mm replace if over
*
Set each piston ring squarely into the
cylinder using the piston and measure the
end gap.
CONNECTING ROD SMALL END
INSPECTION
Install the piston pin and bearing in the
connecting rod small end and check for
excessive play.
Measure the connecting road small end I.D.
Service Limit:
17.03mm replace if over
PISTON/CYLINDER INSTALLATION
First install the expander in the second ring
groove.
Then install the top and second rings in their
respective ring grooves.
The piston rings should be pressed into the
grooves with even force.
After installation, check and make sure that
each ring is flush with the piston at several
points around the ring.
A ring that will not compress means that the
ring groove has carbon deposits in it and
should be cleaned.
6-9
<Small End I.D. Measurement>
piston
expander
Install a new cylinder gasket on the mating surface
between the cylinder and crankcase.
ZX / SCOUT
Top ring
Sencond ring