Replacement spring stainer for the UMS 5-55cc, the five-cylinder 55cc four-stroke radial from UMS.
Function: it is the spring strainer in the lubrication path, which filters debris before it reaches the bearings.
The reason this ends up on an order: the strainer is cleaned at service and renewed if the mesh is damaged — a torn strainer lets debris through to the bearings. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the mesh under good light and renew the retaining clip at the same time.
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