The OS23818500 throttle stop screw from O.S. Engine is an aftermarket service part used to set precise idle and throttle limits on compatible O.S. carburettor models. It provides a repeatable mechanical stop for the throttle barrel or arm, aiding consistent throttle response while you tune the engine.
Replace the stop screw when the original is lost or worn, or when you need small trim changes during engine setup. The replacement process is simple: remove the old screw, inspect the thread and seating in the carburettor body, then fit the new screw and confirm the throttle returns smoothly to the set stop without binding.
Tuning note: adjust in small increments and verify idle and transition under model load rather than on a bench to avoid over-tightening and to preserve safe throttle motion.
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