Replacement cylinder with sleeve for the UMS 5-260cc, the five-cylinder 260cc four-stroke radial from UMS.
Function: it is the cylinder barrel with its pressed-in sleeve, forming the bore the piston runs in.
The reason this ends up on an order: the sleeve is the wear surface; a scored or oval bore is the reason to replace the cylinder rather than just the rings.
Fitting note: Measure the bore at several heights before condemning it, and oil the bore on assembly.
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