Arctic Cat Sno Pro 120 2011, Service Manual

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2-84
CM193

NOTE: The piston pins must be removed from the
PTO-side of the piston.

NOTE: For proper assembly, keep all MAG-side
components and all PTO-side components sepa-
rated. Assemble them on their proper sides.
11. Lift the pistons clear of the connecting rods and
remove the small-end connecting-rod bearings
(account for two washers); then remove the piston
rings. Keep each piston with its rings; keep each pis-
ton pin and bearing together as a set.
CM151

NOTE: Place a suitable length of rubber hose
around the connecting rods to prevent the connect-
ing rods from damaging the crankcase.

NOTE: For servicing procedures, see Cleaning and
Inspecting Engine and Measuring Critical Compo-
nents in this sub-section.
INSTALLING TOP-SIDE
COMPONENTS
1. Place the cylinder base gasket and alignment pins
into position on the crankcase.
2. 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
3. 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.
TZ068

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.
4. Place each piston over the connecting rod so the indi-
cator dot on each piston will point toward the intake/
exhaust ports; then secure with an oiled piston pin.
CAUTION
Do not use the large extractor nut to remove the pin or
damage to the piston may occur.
CAUTION
DO NOT use any type of punch to drive the piston pin
free of the piston; damage may result. Use a piston-pin
puller only.
CAUTION
Incorrect installation of the piston rings will result in
engine damage.
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