24Checking the ignition sparkInsert the combination wrench (9) between the hood and cyl-inder only as shown.CAUTION!Do not insert the combination tool into the spark plug hole,but make contact only with the cylinder (otherwise you maydamage the engine).Using insulated pliers, hold the spark plug (10) (unscrewed butwith the plug cap on) against the combination tool (away fromthe spark plug hole!).Switch the combination switch (11) to ”I”.Pull the starter cable hard.If the function is correct, an ignition spark must be visible nearthe electrodes.CAUTION: Use only BOSCH WSR 6F spark plug, CHAMPIONRCJ-6Y or NGK BPMR 7A.Replacing the suction headThe felt filter (13) of the suction head can become clogged.It is recommended to replace the suction head once everythree months in order to ensure unimpeded fuel flow to thecarburetor.Unscrew the tank cap (12), pull the retainer out of the open-ing.Empty fuel tank.Use a wire hook to pull the suction out of the tank opening forreplacement.Caution: Do not allow fuel to come into contact with skin!Replacing the spark plugCAUTION:Do not touch the spark plug or plug cap if the engine isrunning (high voltage).Switch off the engine before starting any maintenancework.A hot engine can cause burns. Wear protective gloves!The spark plug (Order No. 965 603 021) must be replaced incase of damage to the insulator, electrode erosion (burn) or ifthe electrodes are very dirty or oily.Turn the cover lock (6) to the ”Unlocked ” position and care-fully remove the filter cover (7).Flip up the spark-plug cover (8).Pull the plug cap (8) off the spark plug. Use only the combinationwrench supplied with the saw to remove the spark plug.Electrode gapThe electrode gap must be .020" (0.5 mm).0,5 mm