This is the choke lever assembly for the UMS 7-50cc engine, the seven-cylinder 50cc four-stroke radial from UMS.
The part itself is the choke lever assembly, which enriches the mixture for starting.
Why it is replaced: needed most on cold starts, and a worn lever or detent means the choke will not stay where it is set.
Fitting note: Check the detent action and that the lever returns freely.
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