O.S. Engine OS44906000 Piston Pin FSa-110  [OS44906000]

Piston pin for FSa-110 piston assemblies

This piston pin is an RC-scale replacement part intended specifically for piston assemblies marked FSa-110. It serves the basic mechanical role of securing the piston to the connecting wrist pin area in model internal‑combustion engines so the piston can articulate reliably during operation.

Compatibility is limited to assemblies that reference FSa-110 in their service parts; verify part markings on the piston and rod before installation. The pin is described and sold as a dedicated spare for that piston family rather than a universal-size item.

Installation notes: remove the piston from the sleeve and inspect bores for wear or scoring, align the piston and rod bores, press the pin in until it seats flush with the piston faces, and confirm the piston moves freely on the rod with no binding. If any resistance or visible damage appears, stop and inspect mating surfaces before reassembly.

Tuning and maintenance role: the piston pin is a small but essential component for preserving correct piston travel and ring alignment; during routine engine rebuilds and track-side adjustments replace worn pins to maintain compression consistency and reduce uneven wear on the piston and cylinder.