O.S. Engine OS42506000 Piston Pin for Cylinder/Piston Assemblies  [OS42506000]

Piston pin overview

This is an RC-scale piston pin intended as a direct replacement part for cylinder and piston assemblies used in model engines. It serves the basic mechanical role of securing the piston to the small end of the connecting assembly, keeping piston movement aligned during operation.

When servicing an engine, inspect the piston pin and the mating bore for wear or scoring before reassembly. Proper fit and alignment contribute to stable compression and predictable throttle response, which makes the pin an understated but important part of routine maintenance and setup.

Installation notes: keep tolerances clean and free of debris, use the correct retaining clips or circlips specified by your engine's service manual, and check for lateral play after the pin is fitted. These checks help avoid premature wear and maintain consistent engine behaviour during tuning sessions.