2015 Polaris 550 Indy Adventure Owners Manual - Page 74
2015 Polaris 550 Indy Adventure Manual
Page 74 highlights
MAINTENANCE Spark Plugs Spark Plug Condition Normal Plug 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. TIP: The tip should not be white. A white insulator tip indicates overheating, caused by use of an improper spark plug or incorrect carburetor/throttle body adjustments. Wet Fouled Plug 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 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. TIP: 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). CAUTION! A hot exhaust system and engine can cause burns. Wear protective gloves when removing a spark plug for inspection. 1. Remove the left side panel. 2. Remove the spark plug cap. 3. Using the special wrench provided in the tool pouch, rotate the spark plug counter-clockwise to remove. 4. Reverse the procedure for spark plug installation. Torque to specification. 5. Reinstall the spark plug cap. 72