Craftsman BUSHWACKER 316.715860 Operator's Manual

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15Fig. 210.025 in.(0.635 mm)MAINTAINING THE SPARK PLUG1. Stop the engine and allow it to cool. Grasp the spark plug bootfirmly and pull it from the spark plug.2. Clean around the spark plug. Remove the spark plug from thecylinder head with a 5/8-inch socket, turning counterclockwise.3. Inspect the spark plug. If the spark plug is cracked, fouled ordirty, replace it with a replacement part #753-06193, aChampion RDJ7J or an equivalent spark plug.4. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm)(Fig. 21).5. Install the spark plug in the cylinder head. Tighten the spark plugwith a 5/8-inch socket, turning it clockwise until snug.NOTE: If using a torque wrench, torque to:110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.6. Reattach the spark plug boot.WARNING: Do not sand blast, scrape or clean spark plugelectrodes. Grit in the engine could damage the cylinder.Fig. 20Idle Speed ScrewADJUSTING THE IDLE SPEEDNOTE: Careless adjustments can seriously damage the unit. A Sears orother qualified service dealer should make carburetor adjustments.If, after checking the fuel and cleaning the air filter, the engine stillwill not idle, adjust the idle speed screw as follows:1. Start the engine. Refer to Starting and Stopping.2. Release the throttle control and let the engine idle. If the enginestops, use a small Phillips screwdriver to turn the idle speed screwclockwise, 1/8 of a turn at a time (as needed) until the engine idlessmoothly (Fig. 20).3. If the engine is idling too quickly, turn the idle speed screwcounterclockwise, 1/8 of a turn at a time (as needed) to reduce theidle speed (Fig. 20).Checking the fuel, cleaning the air filter, and adjusting the idle speedshould solve most engine problems. If not, and any of the followingconditions are true, take the unit to a Sears or other qualified servicedealer:• the engine will not idle• the engine hesitates or stalls on acceleration• there is a loss of engine powerWARNING: The cutting head may spin during idle speedadjustments. Wear protective clothing and observe allsafety instructions to prevent serious personal injury.