A crank shaft assembly to suit the UMS 5-55cc — the five-cylinder 55cc four-stroke radial from UMS.
On this engine the component is the complete crankshaft assembly — the shaft with its bearings and drive features already fitted.
Why this part matters: 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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