The OS23818500 throttle stop screw supplied by O.S. Engine is designed for RC carburettors where precise idle and throttle-end limits are required. It acts as the mechanical end point for the throttle barrel or arm, helping preserve a steady idle and predictable throttle behaviour during adjustments.
Use this screw to replace damaged or lost stops, or when making fine trim changes as part of engine tuning. The changeover is straightforward: remove the existing screw, confirm the carburettor thread and seating are sound, and install the replacement so the throttle returns cleanly to its set position without binding.
Practical guidance: make incremental changes, evaluate idle and throttle transition on the actual model, and avoid tightening beyond the point that reduces safe throttle travel.
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