This is the driven belt gear for the DLE 200 twin, a large-displacement two-stroke petrol twin for very large scale models.
The part itself is the driven belt gear in the reduction drive, which takes the belt drive output to the propeller shaft.
Why it is replaced: the driven gear carries the full propeller load through the belt and is replaced when the teeth wear or the bore is damaged.
Fitting note: Check belt tension and alignment after fitting, and inspect the matching pulley.
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