Piston Pin and Retainer Set 21BB

The HPI Piston Pin and Retainer Set 21BB is a genuine HPI Racing replacement for keeping your nitro engine in top condition. Supplied under part number HPI-1413, this OEM set is specified for the Nitro Star F3.5 range and is ideal for routine maintenance and repair work.

Manufactured to HPI standards for fit and reliability, this set helps restore smooth, dependable operation during engine servicing or rebuilds. It’s a straightforward way to maintain performance using original-spec components.

Suggested Compatibility

Suitable for the HPI Nitro Star F3.5 series; suggested compatibility includes 21BB variants where this specification is required. Please check your engine manual or parts list to confirm part number 1413 before purchase.