FZ110S Piston Wrist Pin YSF7329 for YS Engine  [YSF7329]

FZ110S wrist pin replacement overview

The YSF7329 wrist pin is manufactured for use in the YS FZ110S engine family and serves to connect the piston to the connecting rod small end. It is supplied as a service part for model engine maintenance and rebuild work.

Before installing the wrist pin inspect the piston skirt and rod for signs of wear. Press the pin in with care to keep the piston concentric in the bore, confirm retainers like circlips are correctly seated, and use a light glow-engine safe lubricant during the initial running-in period.

Replacing a worn wrist pin can restore piston stability and help maintain consistent ring sealing, improving steadiness without modifying the engine's existing tune settings.