This is the spark plug cap for the DLE 222 twin, a large-displacement two-stroke petrol twin for very large scale models.
The part itself is the spark plug cap, which connects the ignition lead to the plug and suppresses radio interference.
Why it is replaced: caps corrode inside and lose contact, which shows as an intermittent misfire or a dead cylinder that is hard to trace.
Fitting note: Check the internal contact and the fit on the plug, and make sure the cap is fully pushed home.
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