A circlip spring stainer to suit the UMS 7-50cc — the seven-cylinder 50cc four-stroke radial from UMS.
On this engine the component is the circlip that retains the spring strainer in the lubrication path.
Why this part matters: a low-cost item that is replaced on principle whenever the strainer is cleaned or removed. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: A missing clip here can let the strainer move and starve the oil feed.
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