This is the connecting rod small for the UMS 7-35cc engine, the seven-cylinder 35cc four-stroke radial from UMS.
The part itself is the small end of the connecting rod, where it meets the piston pin.
Why it is replaced: the small end wears on high-hour engines and shows up as a rattle at idle or a knocking that changes with load.
Fitting note: Check piston pin and circlip condition at the same time.
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