YS Engine YSF7329 piston wrist pin for FZ110S  [YSF7329]

Piston wrist pin for FZ110S

This is a replacement RC-scale piston wrist pin designed for the YS FZ110S engine family as identified by the part number YSF7329. The component serves the mechanical role of linking the piston to the small end of the connecting rod inside the engine, and is intended strictly for model engine maintenance and rebuilds.

When servicing the FZ110S, inspect the piston and connecting rod for wear before fitting the wrist pin. Install the pin to ensure smooth axial alignment of the piston skirt within the cylinder, verify retention methods such as circlips or other retainers are correctly seated, and use light lubrication compatible with glow engines to ease initial motion during break-in.

In tuning or rebuild work the wrist pin is a wear item that affects piston stability and ring sealing; replacing a worn pin can reduce unwanted piston play and help restore consistent compression and running characteristics without changing the engine’s tuned settings.