ATTENTION: remove the spark plug only when the engine is cold!
Access to the plug is between the air filter housing and the muffler. First,
remove the ignition cable pipe from the spark plug to gain access to it. Before
installing a spark plug - including a new spark plug - check the spark plug gap
and adjust it if necessary. When screwing in a candle, do so as far as it will go,
but tighten it sensitively - usually another 1/3-1/2 turns (see the candle
manufacturer's recommendations). The rest of the assembly reverses to
disassembly.
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Checking/replacing the air filter: