FZ70S Piston Wrist Pin - YS Engine YSG1026  [YSG1026]

Wrist pin for FZ70S piston assemblies

The YS Engine YSG1026 wrist pin is supplied as a direct replacement for the FZ70S piston connection, intended for hobby-grade RC nitro engine upkeep. This description focuses on the component function: it secures the piston to the connecting rod inside the small-scale engine and is intended for routine service or part replacement.

Installation notes: examine the piston skirt and connecting rod bore for wear or scoring before fitting the wrist pin, ensure the circlip or other retention method used by your FZ70S assembly is correctly seated, and rotate the assembled parts by hand to confirm free movement without binding after installation. Use appropriate precision hand tools and follow safe workshop practices when handling internal engine parts.

Service role: the wrist pin is a wear item within the piston assembly; replacing it during an engine refresh or after signs of scoring helps restore internal alignment and reduce incidental friction-related issues. It is intended for scale RC engine upkeep and not as a standalone performance upgrade.