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

Replacement piston pin for FSa-110 assemblies

This piston pin is a scale replacement intended for piston assemblies marked FSa-110. It secures the piston to the connecting wrist pin area in model internal-combustion engines and allows the piston to articulate reliably during operation.

Compatibility is restricted to piston assemblies that carry the FSa-110 service code; confirm the part markings on both the piston and rod before fitting. This item is sold as a dedicated spare for that piston family rather than as a universal pin.

Installation notes: remove the piston from the sleeve and check bores for scoring or wear, align the piston and rod bores, press the pin in until it seats flush with the piston faces, and verify the piston moves freely on the rod without binding. If you find resistance or visible damage, halt and inspect the mating surfaces before reassembly.

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