This is the propeller hub for the DLE 40 single, a mid-size two-stroke petrol engine for sport and scale models.
The part itself is the propeller hub, which mounts the propeller to the crankshaft and transmits drive to it.
Why it is replaced: the hub takes the full propeller load and any prop-strike shock, so cracks or a worn bore are a structural failure risk.
Fitting note: Inspect closely for cracks after any prop contact and check the taper and key for fretting.
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