YS Engine YSS1009 50pc Wrist Pin Retainer Set for RC Pistons  [YSS1009]

Wrist pin retainer for piston assemblies

This YS Engine YSS1009 piston wrist pin retainer is an RC-scale spare designed to secure wrist pins inside piston assemblies, supplied in a 50pcs pack to support routine maintenance and rebuilds.

As a small but critical component in piston assemblies, the retainer limits axial movement of the wrist pin to prevent slippage under the vibration common to RC nitro engines, making it an essential service item for engine rebuilds and spare parts kits.

When installing a new retainer, check the piston and pin for scoring or deformation and replace any worn parts; keep several pieces on hand to match regular service intervals and confirm the retainer seats fully to avoid uneven pin travel.

This component is intended as a direct spare for YS Engine piston assemblies and for compatible RC nitro engine piston rebuilds, serving a maintenance and rebuild function rather than a performance upgrade.