Replacement cylinder assembly for the UMS 5-100cc, the five-cylinder 100cc four-stroke radial from UMS.
Function: it is a complete cylinder assembly — barrel, liner and the associated hardware ready to fit on the crankcase.
The reason this ends up on an order: replacing a cylinder as an assembly is how a top-end overhaul is normally done, since the barrel and liner are matched.
Fitting note: Check the mating face for flatness and fit a fresh base gasket.
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