This is the crank shaft assembly for the UMS 5-75cc engine, the five-cylinder 75cc four-stroke radial from UMS.
The part itself is the complete crankshaft assembly — the shaft with its bearings and drive features already fitted.
Why it is replaced: buying the assembly rather than individual pieces is the practical route when the shaft itself is the failed part, since the bearing surfaces are matched to it.
Fitting note: Keep the assembly supported on its bearings during fitting and never press on the crankpin.
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