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

Piston pin basics

This RC-scale piston pin is supplied as a direct replacement option for cylinder and piston assemblies found in model engines. It fastens the piston to the small end of the connecting assembly and helps maintain correct piston alignment during operation.

Before reassembling an engine, check the pin and mating bore for wear or scoring. Correct fit and alignment contribute to steady compression and consistent throttle response, so this small part plays a key role in maintenance and setup.

Installation tips: keep bores and pins free from dirt, install the retaining clips or circlips specified by your engine maker, and check for any lateral movement once fitted. These steps reduce premature wear and keep engine behavior predictable during tuning.