UMS 7-90cc O-RING BOTTOM COVER ( X 10 PACK)

Replacement o-ring bottom cover for the UMS 7-90cc, the seven-cylinder 90cc four-stroke radial from UMS.

Function: it is the O-ring sealing the bottom cover.

The reason this ends up on an order: the bottom cover seal is where oil leaks are most visible and most likely, so it is renewed at every service. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.

Fitting note: Check the cover face for nicks before fitting the new ring.