A lock nut (in) to suit the UMS 5-55cc — the five-cylinder 55cc four-stroke radial from UMS.
On this engine the component is the internal locking nut for a shaft or bearing location.
Why this part matters: a locking nut that has lost its interference will not stay set, and the results can be expensive. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Replace rather than re-stake a nut, and confirm the setting after torqueing.
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