This is the admission valve plate for the DLE 20RA single, a small-displacement two-stroke petrol engine for sport-scale models.
The part itself is the admission valve plate, which seats the reed petals against the crankcase.
Why it is replaced: replaced if the seating face is scored or the plate is warped, either of which prevents the petals sealing.
Fitting note: Check the plate for flatness on a surface plate and fit a new gasket.
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