This is the propeller washer for the UMS 5-180cc engine, the five-cylinder 180cc four-stroke radial from UMS.
The part itself is the washer that spreads the propeller retaining load against the hub or drive face.
Why it is replaced: a deformed or cracked washer lets the fixing load go slack, which allows the propeller to work loose. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Fit new washers on any reassembly and check for cracking around the bore.
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