O.S. Engine OS42506000 Precision Piston Pin for Model Engine Assemblies  [OS42506000]

Overview of the piston pin

This RC-scale piston pin is supplied as a direct replacement for cylinder and piston assemblies used in model engines. It secures the piston at the small end of the connecting assembly and keeps motion aligned during operation.

Prior to reassembly, inspect the piston pin and its mating bore for scoring or wear. Ensuring a correct fit and alignment supports steady compression and predictable throttle response, making the pin an important element of regular maintenance and tuning work.

Installation notes: maintain clean tolerances, remove foreign matter, fit the retaining clips or circlips recommended in your engine's service documents, and verify there is no excessive lateral play once installed. These measures help prevent premature wear and maintain consistent engine behaviour while tuning.