A o-ring top cover to suit the UMS 7-90cc — the seven-cylinder 90cc four-stroke radial from UMS.
On this engine the component is the O-ring sealing the top cover.
Why this part matters: a hardened O-ring is an oil leak and, worse, lets the cover leak air on some designs. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Renew on every removal and check the groove is clean.
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