Replacement cylinder locking screw for the UMS 5-100cc, the five-cylinder 100cc four-stroke radial from UMS.
Function: it is the cylinder locking screws holding the barrel to the crankcase.
The reason this ends up on an order: replaced on overhaul or whenever the torque cannot be held. Supplied as a pack of 5, which is how these small parts are normally bought — you rarely need just one.
Fitting note: Clean the threads and apply the specified torque in stages.
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