Replacement spring washer outer for the UMS 7-90cc, the seven-cylinder 90cc four-stroke radial from UMS.
Function: it is the outer spring washer for a bolted joint.
The reason this ends up on an order: 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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