Replacement rocker arm for the UMS 7-77cc, the seven-cylinder 77cc four-stroke radial from UMS.
Function: it is the rocker arm, which transfers camshaft motion to the valve stem.
The reason this ends up on an order: the rocker is a wear point at both the bush and the pad, and a rough adjuster or a worn pad changes the valve clearance as the engine gets hot. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the pad face and the bush bore, and set clearance cold to the factory figure.
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