Stihl FS 56 RC-E Product Instruction Manual - Page 36

English Spark Plug If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded. 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. Removing the Spark Plug N Shut off the engine 1 The spark plug boot (2) sits inside the cap (1). The cap (1) protects the spark plug boot from damage. Do not operate the machine without a cap - replace a damaged cap. N Pull off the spark plug boot (2) together with the cap (1). N Unscrew the spark plug (3). 34 547BA028 KN 000BA039 KN 000BA071 KN If the cap becomes detached while pulling off the spark plug boot, see "Installing the Spark Plug". Checking the Spark Plug A N Clean dirty spark plug. 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: - Too much oil in fuel mix. - Dirty air filter. - Unfavorable running conditions, e.g. operating at part load. 1 2 Warning! To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. Installing the Spark Plug N Screw the spark plug into the cylinder. N Press the spark plug boot with cap firmly on to the spark plug. If the cap has become detached from the spark plug boot: FS 56, FS 56 R, FS 56 C, FS 56 RC