40R 45R FS FT Rotor Stop Set Screw - O.S. Engine OS22681306  [OS22681306]

Part description and intended fitment

This rotor stop set screw supplied by O.S. Engine is a small but vital replacement part for RC glow engines. It acts as the mechanical limit that secures rotor indexing on the compatible engine models listed in the product name, helping to keep alignment consistent during maintenance and adjustments.

Compatibility is confined to the model codes indicated in the product name: 40R, 45R, FS, FT. Fitment to other engines should not be presumed unless confirmed in the specific engine documentation.

For installation: remove the existing rotor stop, confirm clean threads and correct seating, fit the replacement set screw and tighten with care to prevent damage to the threads. After installation, check rotor indexing before returning the model to service.

Role in setup: this item is a service replacement used during routine maintenance or when a fastener is lost or worn. It supports stable rotor positioning which aids consistent engine setup and performance checks.