Polaris 120 XC SP - Manual (Page 71)

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MAINTENANCE
Engine
Proper off-season preparation of the engine and fuel system is vital to
the prevention of rust and corrosion formation on precision engine
parts during storage.
Without proper storage, jet restriction can cause lean conditions and
very poor slow speed driving quality.
When preparing your snowmobile for off-season storage, we
recommend that you add fuel conditioner/stabilizer or Premium Carbon
Clean (PN2871326) to the fuel tank. Follow the instructions on the
can. Run the engine for five minutes to get additives through the entire
fuel system. Then top off the tank with fresh fuel.
NOTE: This procedure is performed best when the front of the
machine is elevated and the engine is tilted rearward.
Storage
Off season or extended storage of your snowmobile requires you to
take preventative measures to aid against deterioration and to prolong
the useful life of many components.
Your snowmobile should be stored in a dry garage or shed, out of
direct sunlight, and covered with a fabric snowmobile cover. Plastic
tarp can cause condensation to form and may damage some
snowmobile components.