This is the carburettor for the UMS 7-360cc engine, the seven-cylinder 360cc four-stroke radial from UMS.
The part itself is the carburettor, which meters fuel into the intake air stream.
Why it is replaced: carburettors are replaced when a needle or seat wears, when a slide or throttle shaft is sloppy, or when tuning cannot be made consistent — a lean-running carb is a real risk on an air-cooled radial.
Fitting note: Check the manifold joint and gasket at the same time, and re-set the needles from a known baseline.
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