Replacement bottom cover for the UMS 5-180cc, the five-cylinder 180cc four-stroke radial from UMS.
Function: it is the bottom cover, which closes the underside of the crankcase.
The reason this ends up on an order: the lowest point of the engine, so it collects oil and is the first thing damaged in a wheels-up landing.
Fitting note: Check for cracks around the screw holes and fit a new gasket.
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