The OS23818500 throttle stop screw from O.S. Engine is supplied for RC carburettor idle and throttle-end trimming on matching O.S. models. It defines the mechanical limit of the throttle barrel or arm, helping to keep a reliable idle setting and steady throttle response during adjustments.
Use the screw as a direct service replacement when the original is damaged or missing, or when performing fine trim changes during engine set-up. To install, remove the old screw, check the seating and thread condition in the carburettor body, fit the replacement, and confirm the throttle returns smoothly to the stop without catching.
Advice for tuning: make small incremental turns, evaluate idle and mid-range transition on the model under load, and avoid excessive tightening that would reduce safe throttle travel.
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