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

Piston pin designed for the FSa-110 family

This piston pin is produced as a replacement component for piston assemblies marked FSa-110. It secures the piston to the wrist pin area so the piston articulates correctly in model internal-combustion engines.

Use only with assemblies that reference FSa-110; confirm the service code on the piston and rod before installation. The pin is intended as a dedicated spare for that piston series rather than as a universal item.

Fitting steps: remove the piston from the sleeve and inspect both bores for scoring or deformation, align the piston and rod bores, insert the pin until it seats flush with the piston faces, and ensure there is free, unobstructed movement. If any tightness or damage is detected, stop and check mating surfaces before finishing assembly.

Tuning note: a properly fitted piston pin preserves piston travel and ring alignment; replacing worn pins during rebuilds helps keep compression stable and reduces asymmetric wear across the piston and liner.