UMS 5-260cc ROCKER ARM WITH BUSH ( X 2 QTY / Pack)

This is the rocker arm with bush for the UMS 5-260cc engine, the five-cylinder 260cc four-stroke radial from UMS.

The part itself is the rocker arm with its bronze bush already fitted and reamed.

Why it is replaced: buying the arm with the bush in place avoids the reaming step and guarantees a matched bore. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.

Fitting note: Check the rocker shaft for wear before fitting a new arm.