2005 Polaris Touring Snowmobiles Owners Manual - Page 94

General Maintenance Spark Plugs MAINTENANCE Spark plug condition is indicative of engine operation. The spark plug firing end condition should be read after the engine has been warmed up and the vehicle has been driven at higher speeds. Immediately check the spark plug for correct color. WARNING A hot exhaust system and engine can cause serious burns. Wear protective gloves when removing a spark plug for inspection. NOTE: Incorrect fuel mixture can often cause a spark plug to appear too dark or too light in color. Before changing spark plug heat ranges, be sure the correct main jet is installed in the carburetor(s). Refer to the Owner's Manual Supplement or see your dealer. 1. Normal The normal insulator tip is gray, tan or light brown. There will be few combustion deposits. The electrodes are not burned or eroded. This indicates the proper type and heat range for the engine and the service. NOTE: The tip should not be white. A white insulator tip indicates overheating, caused by use of an improper spark plug or incorrect carburetion adjustments. 2. Wet Fouled The wet fouled insulator tip is black. A damp oil film covers the firing end. There may be a carbon layer over the entire nose. Generally, the electrodes are not worn. General causes of fouling are excessive oil, use of non-recommended injection oil, improper use of the choke, or incorrect carburetion adjustments. Spark Plug Removal and Replacement 1. Remove the spark plug cap. 2. Using the special wrench provided in the tool pouch, rotate the spark plug counterclockwise to remove. 3. Reverse the procedure for spark plug installation. 4. Torque to 18-22 ft. lbs. (24-30 Nm). 5. Install spark plug cap. 91