How to Adjust a '97 Ski-Doo for High Elevation

Riding a 1997 Ski-Doo snowmobile at high elevation requires special adjustments to its carburetors. This is because the air is thinner at higher elevations so you need to adjust the carburetor to compensate for this reduction. This adjustment changes the air/fuel ratio at the carburetor to let in more air. It is called running the engine lean and can result in blowing up the engine if there is too much air. It is important that you return the carburetor settings to their original position when riding back at normal altitude.

Things You'll Need

  • Screwdriver
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Instructions

    • 1

      Look at the Ski-Doo's date plate fastened to the tunnel to determine the size of the engine. This information is listed in CCs (cubic centimeters).

    • 2

      Determine if the altitude at which you are riding is greater than 5000 feet above sea level. If it is less, you shouldn't need to adjust the factory settings.

    • 3

      Start the Ski-Doo and go for a short ride to warm up the engine. Shut down the engine.

    • 4

      Open the hood and locate the carburetors, which are typically directly behind the engine. There is one carburetor for each cylinder.

    • 5

      Locate the high-speed needle adjustment screw on the carburetor, typically located near the top. It looks similar to the low-speed needle screw, so don't confuse the two. Your owner's manual can point you to the exact location if you are unsure.

    • 6

      Turn the high-speed needle one full turn clockwise, with a screwdriver, if your engine is 400 CCs or greater. Turn it 5/8th of a turn clockwise if it is less than 400 CCs. Repeat this process on each carburetor.