Replacement throttle lever 621 for the UMS 5-150cc, the five-cylinder 150cc four-stroke radial from UMS.
Function: it is the throttle lever (621 type) linking the throttle servo to the carburettor.
The reason this ends up on an order: replaced when the lever or its pivot wears, which shows as an inconsistent idle. Supplied as a pack of 10, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Set the linkage so the carburettor reaches both stops without binding.
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