UMS 5-210cc THROTTLE LEVER 621 ( X 10 PACK)

This is the throttle lever 621 for the UMS 5-210cc engine, the five-cylinder 210cc four-stroke radial from UMS.

The part itself is the throttle lever (621 type) linking the throttle servo to the carburettor.

Why it is replaced: 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.