Replacement bearing (top cover) for the UMS 5-100cc, the five-cylinder 100cc four-stroke radial from UMS.
Function: it is the bearing carried in the top cover, which supports the upper end of the cam or valve train.
The reason this ends up on an order: a bearing at this location runs hot and oil-starved if the cover feed is restricted, and failure is audible before it is visible. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the cover bore and the feed passage when renewing the bearing.
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