Stihl MM 55 Instruction Manual - Page 23

English Engine Running Behavior Storing the Machine 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) snugly 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 Installing the spark plug 0000-GXX-1830-A0 If engine running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted, the cause may be the muffler. Have the muffler checked for contamination (carbonization) by your servicing dealer. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. If the machine is to remain out of use for approx. 3 months or more N Drain and clean the fuel tank in a well ventilated place N Ensure that the fuel is disposed of correctly and without harming the environment N Run the engine until the carburetor is dry, this helps to prevent the carburetor diaphragms sticking together N Thoroughly clean the machine - pay special attention to the cylinder fins and air filter N Remove, clean and inspect the working tool N Store machine in a safe and dry place. Protect against unauthorized use (e. g., by children) N Screw home the spark plug, fit the boot and press it down firmly. MM 55, MM 55 C 21