Replacement connecting rod small for the UMS 5-55cc, the five-cylinder 55cc four-stroke radial from UMS.
Function: it is the small end of the connecting rod, where it meets the piston pin.
The reason this ends up on an order: 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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