O.S. Engine OS22681306 Rotor Stop Set Screw for 40R,45R,FS,FT engine models  [OS22681306]

Rotor stop set screw details and use

This rotor stop set screw from O.S. Engine is a compact replacement part designed for RC glow engine maintenance and tuning. It functions as the mechanical stop that locks rotor positioning on the engine codes listed in the product name, helping preserve consistent rotor alignment while you service or adjust the engine.

Compatibility is restricted to the engine codes shown in the product name: 40R, 45R, FS, FT. Do not assume it fits other engines or installations unless the engine documentation explicitly lists those codes.

Installation guidance is straightforward: remove the existing rotor stop, check thread engagement and seating, fit the replacement set screw and tighten carefully to avoid thread damage. After fitting, verify rotor position and a basic functional check before returning the model to full operation.

Tuning role: this service item is used during routine maintenance or when replacing a worn or lost fastener. It helps keep rotor position stable, which supports repeatable engine behavior during bench setups and on-track tuning.