Spark Plug Muffler/Spark Arrester A light brown insulator indicates that a plug is correct. At the intervals shown in the Periodic Maintenance A white or dark insulator indicates that the engine may Chart, clean the spark arrester using the following pro- need to be serviced or the carburetor may need to be cedure. adjusted. To maintain a hot, strong spark, keep the plug free of carbon. ! WARNING Wait until the muffler cools to avoid burns. 1. Remove the cap screws securing the spark arrester assembly to the muffler; then loosen and remove the arrester. ATV-0051 ! CAUTION Before removing a spark plug, be sure to clean the area around the spark plug. Dirt could enter engine when removing or installing the spark plug. KC154A Adjust the gap to 0.7-0.8 mm (0.028-0.032 in.) for 2. Using a suitable brush, clean the carbon deposits proper ignition. Use a feeler gauge to check the gap. from the screen taking care not to damage the screen. NOTE: If the screen or gasket is damaged in any way, it must be replaced. 3. Install the spark arrester assembly with gasket; then secure with the cap screws. Tighten to 48 in.-lb. ATV0052C When installing the spark plug, be sure to tighten it securely. A new spark plug should be tightened 1/2 turn once the washer contacts the cylinder head. A used spark plug should be tightened 1/8 - 1/4 turn once the washer contacts the cylinder head. KC145 2-8