A valve inlet to suit the UMS 5-55cc — the five-cylinder 55cc four-stroke radial from UMS.
On this engine the component is the inlet (intake) valve, through which the fresh charge enters the cylinder.
Why this part matters: inlet valves run cooler than exhausts but wear at the guide and can leak at the seat on a high-hour engine. Supplied as a pack of 2, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Check guide clearance and seat contact pattern after lapping.
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