Stihl TS 500i Instruction Manual - Page 45

English 0000-GXX-1830-A0 Spark Plug If there is a loss of engine power, the machine is difficult to start or runs poorly at idle, first check the spark plug. Install a new spark plug after approx. 100 operating hours or earlier if the electrodes are eroded/corroded. The 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 degrade performance. Removing the spark plug N Turn off the engine - move the stop switch to STOP or 0 1 2 N Remove the screw (1) and remove the cap (2) - the screw (1) is secured in the cap (2) to prevent loss 1307BA030 KN 3 4 N Remove the spark plug boot (3) N Unscrew the spark plug (4) Checking the spark plug A N Clean the spark plug if it is dirty N Check the electrode gap (A) and readjust if necessary - see "Specifications" N Use only resistor type spark plugs of the approved range. See the chapter "Specifications" in this instruction manual Correct the problems that have caused fouling of the spark plug: - too much oil in fuel mix; - dirty air filter; or - unfavorable running conditions, e.g. operating at part throttle. 000BA039 KN 1307BA031 KN 1 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) firmly and securely onto the spark plug terminal (2). 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 TS 480i, TS 500i 43