A propeller drive to suit the UMS 5-250cc — the five-cylinder 250cc four-stroke radial from UMS.
On this engine the component is the propeller drive, which transmits crankshaft torque to the propeller hub.
Why this part matters: the drive is subject to the full propeller load and to any prop-strike shock, and a worn or cracked drive is a structural failure risk.
Fitting note: Inspect closely for cracks after any prop contact and check the key and keyway at the same time.
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