2004 Poalaris MSX110, MSX150 PWC Original Service Manual, Page 43Get this manual
MAINTENANCE OffSeason Storage
The offseason storage period is determined to be the time when 1The watercraft will not be used for 30 or more days, or, 2The end of the normal riding season where the watercraft will be "winterized" for storage1Remove the engine oil and replace with new
Used oil contains water, and unburned fuelWhen left inside the engine for extended periods of time, internal engine corrosion can occurFlushing the freshwater cooling circuit will remove salt, vegetation, and any other foreign material trapped within the circuitUsing coolant tester, commercially available, test the boil over and freeze temperature of the engine coolantA 5050 mixture of distilled water to propolyne glycol should yield freeze temperature of approximately 26_FA 6040 mixture (coolant to distilled water) should be used where the water temperatures remain cool throughout the year and where the air temperature drops below 26_FA full fuel tank will prevent the formation of moisture and mold inside the tank
2Flush the freshwater cooling circuit