Replacement circlip (rocker arm) for the UMS 5-210cc, the five-cylinder 210cc four-stroke radial from UMS.
Function: it is the circlip that retains the rocker arm on its shaft.
The reason this ends up on an order: a service item renewed whenever the rocker gear is dismantled. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Make sure the clip seats in its groove before refitting the cover.
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