Replacement rocker arm pin x for the UMS 7-160cc, the seven-cylinder 160cc four-stroke radial from UMS.
Function: it is the rocker arm pin, which the rocker pivots on.
The reason this ends up on an order: a worn pin is what causes rocker rattle and inconsistent valve clearance. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Replace pins and arms together when either is worn past limits.
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