Stihl FS 490 C-M Instruction Manual - Page 41
Stopping the Engine.
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3 N Lift the front of the cap (2) and push it to the rear to disengage. N Leave the cap to one side. N Pull off the spark plug boot (3). N Unscrew the spark plug. 9926BA021 KN N Check electrode gap (A) and readjust if necessary - see "Specifications". N Use only resistor type spark plugs of the approved range. Rectify problems which have caused fouling of spark plug: N Too much oil in fuel mix. N Dirty air filter. N Unfavorable running conditions, e.g. operating at part load. Fit a new spark plug after approximately 100 operating hours or earlier if the electrodes are badly eroded. English Do not use a spark plug with a detachable SAE adapter terminal (3). Arcing may occur that could ignite combustible fumes and cause a fire. This can result in serious injuries or damage to property. N Only use resistor type spark plugs with solid, non-threaded terminals Installing the spark plug N Screw in spark plug N Firmly press the spark plug connector onto the spark plug. 0000-GXX-B459-A0 000BA039 KN 1 A Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. N Remove spark plug - see "Starting / Stopping the Engine". N Clean dirty spark plug. 3 2 WARNING To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press the spark plug boot (1) snugly onto the spark plug terminal (2). 0000-GXX-1830-A0 N Align the spark plug connector so that the ignition cable points to the upper left corner (arrow). FS 460 C-M, FS 460 C-M L, FS 490 C-M, FS 490 C-M L 39