YS Engine FZ70S Piston Wrist Pin YSG1026  [YSG1026]

Piston wrist pin for the FZ70S engine family

The YS Engine YSG1026 wrist pin is supplied as the correct replacement for the FZ70S piston assembly, providing the mechanical link between piston and connecting rod in hobby nitro engines. The description concentrates on the part's maintenance role rather than performance claims.

Installation notes: prior to fitting, inspect the piston skirt and connecting rod bore for signs of wear or scoring, seat the retention method used by your FZ70S (circlip/pin) properly, and hand-rotate the assembly to ensure no binding occurs after installation. Employ suitable small tools and follow safe bench practices while handling internal engine components.

Service role: as a wear item the wrist pin should be renewed during engine overhauls or when damage is apparent; replacing it can reestablish internal alignment and reduce incidental friction, but it is not intended to alter engine tuning on its own.