This is the connecting rod pin for the UMS 9-115cc engine, the nine-cylinder 115cc four-stroke radial from UMS.
The part itself is the connecting rod pin locating the rod endwise.
Why it is replaced: a worn pin allows the rod to move and causes a knock. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check the pin bore and renew the associated clips.
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