A piston pin assembly to suit the UMS 5-55cc — the five-cylinder 55cc four-stroke radial from UMS.
On this engine the component is the piston pin assembly with its retaining circlips.
Why this part matters: supplied as a set so the pin and its retention are renewed together, which is how a pin should be replaced. Supplied as a pack of 4, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Make sure the circlips seat fully in their grooves — a displaced clip will score the bore.
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