CPI ARAGON, Service Manual, Page: 62 / 93

CRANK DRIVE / CRANKCASE / CRANKSHAFT CR-7
PISTON ASSEMBLY
Put the oiled needle bearing into the
connecting rod eye.
Place the piston with its arrow
orienting towards the opening. If the
arrow is no longer detectable, then
the piston ring gaps must always be
opposite to the opening.
Slightly press the piston pin into the piston
until it meets the circlip. Then install the
second circlip.
Prior to placing the piston, the tread of the
cylinder and the piston have to be slightly
lubricated with two-stroke oil.
The circlips have to be installed in
such a way that their fastening hooks
are aligned with the direction of
movement of the piston.
Check the connecting rod small end.
Wear limit: 14.06 mm
CYLINDER ASSEMBLY
Mount a new cylinder base gasket.
Slightly lubricate the cylinder, the piston, and
the piston rings and mount the cylinder.
Torque: 15 Nm
COMPRESSION PRESSURE
TESTING
Make sure that the engine has
reached its operating temperature
and that the throttle valve is fully
opened.
Remove the spark plug connector.
Remove the spark plug and connect a
compression tester. Turn on the ignition.
Fully open the throttle and start the engine for
about 7 – 8 seconds until the display on the
tester indicates a stable measuring value.
Compression pressure: 8.5 bar at 600 min
-1
All ignition cables shall be grounded
prior to pressing the start button to
avoid ignition sparks.