Stihl FS 490 C-M Instruction Manual - Page 40

English Cleaning the Air Filter N Loosen filter cover mounting screws. N Remove the filter cover. N Clean away loose dirt from around the filter (5) and inside the filter cover. N Knock the filter (5) out on the palm of your hand or blow it clear with compressed air from the inside outwards. In case of stubborn dirt or sticky filter fabric: N Wash the filter in a clean, nonflammable solution (e.g. warm soapy water) and then dry. Always replace a damaged filter. Electric Handle Heating Spark Plug Depending on the version, the power tool may be equipped with a handle heating system. 1 N Switch on handle heating by moving the switch (1) on the left handle to Z. Switch off the heating if the handle temperature feels too high. N Move the switch (1) to 0 There is no risk of overheating during long periods of operation. The heating system is maintenance-free. Contact your dealer if you have any problems. STIHL recommends a STIHL servicing dealer. 2709BA020 KN 9926BA020 KN 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 approximately 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 1 N Rotate the screw (1) in the cap (2) until the screw head projects from it. 38 FS 460 C-M, FS 460 C-M L, FS 490 C-M, FS 490 C-M L