This is the piston ring for the DLE 55RA single, a two-stroke petrol engine for larger sport and scale models.
The part itself is the piston ring, which seals compression on the piston.
Why it is replaced: a ring is a wear item replaced at overhaul; a worn or stuck ring shows as falling compression, difficult starting and rising fuel consumption.
Fitting note: Check the ring end gap in the bore and make sure the ring is free in its groove.
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