Adjusting the carburetor of the Ski-Doo is a job that you can do in just a few minutes with some basic shop tools. The carburetor is located under the engine cover on the top of the motor and has two mixture needles to adjust the carburetor. Setting the mixture needles routinely will keep the engine running at peak performance as well as providing better fuel efficiency.
Turn both the low-speed and high-speed mixture needles clockwise gently on the carburetor with a screwdriver until the needles are lightly seated. Do not over-tighten the needles.
Adjust the low-speed mixture needle by turning it counterclockwise 3/4 of a turn with the screwdriver. Turn the high-speed mixture needle counterclockwise 1 1/4 turns with the screwdriver.
Start the Ski-Doo motor and let it warm up for about 5 minutes. Test the carburetor settings by driving the Ski-Doo for about a mile at 6,000 rpm.
Take the spark plug out of the motor with a socket wrench and examine the insulator tip on the end of the plug. If the tip is black, the carburetor is running too rich and needs to be leaned out a bit by turning the high-speed mixture needle clockwise 1/4 turn with the screwdriver.
Adjust the high-speed mixture needle counterclockwise 1/4 turn with the screwdriver if the insulator is light gray, indicating that it is running too lean and needs to get just a bit richer mixture. If the insulator is brown, the settings are just right.
Clean off the tip of the spark plug with a clean cloth and secure the plug in the Ski-Doo. Drive the Ski-Doo again for about a mile at 6,000 rpm and repeat Steps 4 and 5 until the insulator is a brownish color.
- To avoid injury, be careful of moving and hot parts while adjusting the Ski-Doo carburetor with the engine running.