A spring washer outer to suit the UMS 7-77cc — the seven-cylinder 77cc four-stroke radial from UMS.
On this engine the component is the outer spring washer for a bolted joint.
Why this part matters: a consumable locking item renewed at each reassembly. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Fit a new washer under the head and check the joint has not fretted.
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