9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
2.63
OFF SEASON STORAGE
TREATING THE FUEL SYSTEM
As the riding season draws to a close, Polaris
recommends riders begin treating their snowmobile’s fuel
system with Polaris Carbon Clean or similar
commercially-available fuel stabilizer.
Treating the fuel system with Carbon Clean during the
last few rides of the season ensures the entire fuel
system is treated. Then, when it comes time to store the
snowmobile, all the rider has to do is completely fill the
fuel tank with fresh, non-oxygenated fuel and treat the
new fuel with Carbon Clean.
It is also recommended riders use non-oxygenated fuel
during the last rides of the season as non-oxygenated
fuel stores better than oxygenated fuel and resists water
vapor absorption.
If the rider was unable to treat the fuel system and/or use
non-oxygenated fuel at the end of the riding season, the
rider should do the following:
1. The rider should consume as much fuel in the fuel
tank as possible during the last rides of the season.
2. When performing the summerization storage
procedures, fill the fuel tank completely with non-
oxygenated fuel. Note that most oxygenated fuels
contain ethanol. Since ethanol is hydroscopic,
oxygenated fuel will absorb a small amount of water
vapor during the storage season and more so in
humid locations. Completely filling the tank with non-
oxygenated fuel minimizes water vapor absorption
during the storage period and limits the amount of air
and water vapor that can accumulate in the tank.
3. Treat the fuel in the fuel tank with the recommend
amount of Polaris Carbon Clean. The recommended
mixing ratio is outlined on the bottle label.
4. Position the snowmobile outside in a well-ventilated
area.
5. Start and run the engine for 10-15 minutes to
distribute the treated fuel throughout the fuel system.
NOTICE
On Carbureted engines (550cc / 120 Youth), run the
engine for 10-15 minutes and then turn the fuel shut off
valve to ‘OFF’. Continue to run the engine until the
engine stalls and turns off. Doing this drains the
carburetors of fuel.
FOGGING THE ENGINE
Fogging the engine with Polaris fogging oil or similar
commercial alternative is probably the most important
storage step a rider can do to ensure the internal parts of
their snowmobile’s engine do not rust and corrode during
the storage season.
To fog the engine, do the following:
1. Remove the spark plugs from the engine.
2. Liberally spray fogging oil into each spark plug hole. If
possible, have an assistant slowly pull on the recoil
rope to rotate the engine while spraying the oil into
each cylinder.
3. Loosely install the spark plugs.
NOTICE
Do not install new spark plugs after fogging the
cylinders. Fogging oil prevents the formation of rust /
corrosion by sticking to the internal engine components
– including the spark plug electrodes. Replace these
spark plugs the following season after all of the fogging
oil has been burned out of the engine.
DRIVE BELT STORAGE
Never leave the drive belt installed in the clutches as
oxidation may form where the belt contacts the aluminum
clutch sheave faces.
To clean the drive and driven clutches, do the following:
1. Remove the primary and spare drive belt from the
snowmobile.
2. Inspect the drive belt for wear and glazing. Compare
the primary belt with the spare belt. Decide if a new
belt is needed next season and note the primary belt
can now be used as the spare belt next season.
3. Clean the drive and driven clutch sheaves with
Isopropyl Alcohol. Allow the alcohol to air dry.
Continue cleaning the sheave faces until all belt
residue is removed.
