Arctic Cat Sno Pro 120 2011, Service Manual

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2-61
2
CM151

NOTE: For servicing procedures, see Cleaning and
Inspecting Engine and Measuring Critical Compo-
nents in this sub-section.
INSTALLING TOP-SIDE
COMPONENTS
1. Install the piston rings on each piston so the letter on
the top (inclined surface) of each ring faces the dome
of the piston.
726-306A
2. Apply oil to the connecting-rod small end bearings;
then install the small-end bearings. Install a washer
on each side of the connecting rod.

NOTE: The shoulder side of the washer must seat to
the needle bearing.
CM172A

NOTE: Prior to installing the pistons, make sure to
install the MAG-side piston pin circlips first.
3. Place each piston over the connecting rod so the indi-
cator dot on each piston will point toward the intake/
exhaust ports; then install an oiled piston pin and
secure the pin with the remaining circlips.

NOTE: The indicator dot (A) is found on the piston
dome.
CM194A
CM195B
4. Rotate each piston ring until the ring ends are prop-
erly positioned on either side of the ring keeper; then
apply oil to the piston assemblies and cylinder bores.

NOTE: Before installing the cylinders, make sure
the alignment pins are in place in the crankcase.
5. In turn on each cylinder, place a piston holder (or
suitable substitute) beneath the piston skirt and
square the piston in respect to the crankcase; then
using a ring compressor or the fingers, compress the
rings and slide the cylinder over the piston. Remove
the piston holder and seat the cylinder firmly onto
the crankcase.
CAUTION
Incorrect installation of the piston rings will result in
engine damage.
CAUTION
Make sure the circlips are firmly seated and the open
end is directed either up or down before continuing with
assembly.
CAUTION
The cylinders should slide on easily. DO NOT force the
pistons into the cylinders.
Manual
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