This is the rocker arm pin for the UMS 5-250cc engine, the five-cylinder 250cc four-stroke radial from UMS.
The part itself is the rocker arm pin, which the rocker pivots on.
Why it is replaced: a worn pin is what causes rocker rattle and inconsistent valve clearance. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Replace pins and arms together when either is worn past limits.
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