2007 Polaris Two Stroke Snowmobile Workshop Repair manual, Page 60Get this manual
MAINTENANCE Piston Ring Installed Gap Recommended Coolant
Polaris snowmobiles use premium 6040 pre-mix antifreezeThis premium antifreeze is mixed with deionized water for better protection for aluminum coolingThis pre-mix is good for temperatures down to -62F (-52C)Replace coolant every years or if contaminatedPosition the ring .50" (1.3 cm) from the top of the cylinder using the piston to push it squarely into placeMeasure installed gap with feeler gauge at both the top and bottom of the cylinderNOTE: difference in end gap indicates cylinder taperThe cylinder should be measured for excessive taper and out of roundReplace rings if the installed end gap exceeds the service limitAlways check piston ring installed gap after reboring cylinder or when installing new rings
Cooling System Bleeding
123Allow the cooling system to cool completelyCheck the coolant reservoir and make sure it is at the FULL COLD markPlace the snowmobile in its normal riding position and apply the parking brake and run the engine at the specified idle RPM until the thermostat opens upElevate the front of the machine slightlyOpen the bleed screw (A) at the top of the water outlet manifold.Only open slightly, do not remove the screw