This OS23818500 throttle stop screw from O.S. Engine is a compact RC carburettor component used to make accurate idle and throttle-end adjustments on compatible O.S. carburettor models. It establishes the mechanical limit for the throttle barrel or arm so you can hold a consistent idle and improve throttle repeatability while tuning.
Fit this part when the original stop screw is worn, damaged, or missing, or when you need to make small trim changes during engine set-up. Installation is simple: remove the old screw, inspect the thread and seat in the carburettor body, and install the replacement making sure the throttle returns cleanly to the set stop without binding.
Tips for on-model tuning: turn the screw in small increments, test idle and throttle transition with the model under normal load, and avoid over-tightening to preserve safe throttle travel and response.
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