This is the spark plug for the DLE 55RA single, a two-stroke petrol engine for larger sport and scale models.
The part itself is the spark plug, which ignites the mixture in the cylinder.
Why it is replaced: plugs are consumables that foul, erode at the electrode and suffer from an over-rich or lean mixture; on a two-stroke they also oil up at low throttle.
Fitting note: Check the gap and read the insulator colour — the plug is the cheapest diagnostic on a petrol two-stroke.
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