Arctic Cat Sno Pro 120 Service Manual page 101

10. Remove the eight nuts securing the cylinders to the
crankcase; then using a rubber hammer, gently tap
the cylinders and remove from the crankcase by lift-
ing them straight up off their studs. Account for gas-
ket(s) and any alignment pins.
11. Remove the PTO-side piston-pin circlip from the
PTO-side piston; then remove the MAG-side piston-
pin circlip from the MAG-side piston. Discard the
circlips.
12. Using Piston Pin Puller, remove the piston pins from
both pistons.
 NOTE: For proper assembly, keep all MAG-side
components and all PTO-side components sepa-
rated. Assemble them on their proper sides.
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.
13. 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.
Place rubber bands over the connecting rods and
around the cylinder studs to prevent the connecting
rods from damaging the crankcase.
14. Remove the intake flanges and reed valve assem-
blies.
CM149
15. Remove the three cap screws securing the thermostat
cap; then remove the cap, gasket, and thermostat.
FC029
16. Remove the six screws securing the water pump cover
to the crankcase and remove the cover. Account for
the O-ring gasket and the alignment pins.
17. Remove the cap screw securing the water pump
impeller; then slide the impeller free of the shaft.
18. Remove either lower union cap screw securing the
lower check valve assembly; then remove the two
screws securing the oil-injection pump to the crank-
case. Remove the pump, retainer, and O-ring.
CAUTION
CM151
2
FC030
FC032
2-81