How to Fog a Snowmobile Engine

Snowmobiling can be a fun outdoor activity for the entire family. Proper maintenance of your snowmobile engine will help provide years of trouble-free service. Long-term storage can dry out the cylinders and other vital drivetrain surfaces. Fogging the engine before long-term storage reduces the chance of internal corrosion and rusting. An aerosol can of fogging oil can be purchased from most automotive, marine, or snowmobile parts suppliers.

Things You'll Need

  • Fuel stabilizer
  • Spark plug socket and wrench
  • Fogging oil
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Instructions

    • 1

      Open the fuel tank and add fuel stabilizer to the gasoline. Fill the tank with fuel to reduce condensation and corrosion.

    • 2

      Start the snowmobile engine and let it run for 5 minutes. This will carry the stabilized fuel throughout the system.

    • 3

      Open the hood to gain access to the engine compartment and remove the air box from the throttle bodies. Turn off the fuel supply valve and spray fogging oil directly into each of the throttle bodies until the engine stalls.

    • 4

      Allow the engine to cool. Remove the wires from the spark plugs by grasping them with your hands and firmly pulling up on them until they come off.

    • 5

      Remove the spark plugs using a socket wrench. Inspect them for carbon build-up and corrosion.

    • 6

      Spray fogging oil directly into the spark plug holes for approximately 3 seconds.

    • 7

      Replace the spark plugs. Use new plugs if the old ones appear worn. Leave the plug wires off at this point.

    • 8

      Pull the starter rope three or four times to coat the cylinder walls with the fogging oil. Crank the engine a few times, if the snowmobile is equipped with electric start.

    • 9

      Replace the plug wires back on the spark plugs by placing them on top of the plugs and applying pressure with your fingers until you feel them snap into place.

    • 10

      Close the hood.