Piston Pin for GF30 Engines OS4A006000 by O.S. Engine  [OS4A006000]

Replacement piston pin for GF30 engines

This O.S. Engine OS4A006000 piston pin serves as an RC-scale spare compatible with GF30 engine assemblies. The part's role is to lock the piston to the connecting assembly inside the cylinder, and it is supplied as a single replacement piece for maintenance or repair of compatible GF30 model engines.

Routine procedure includes removing the piston, checking the circlips and piston bore for signs of scoring or wear, fitting the pin through the piston and small end, and seating the retaining clips correctly. Perform a simple lateral-play check and ensure the piston swings freely after installation.

Replacing an aged pin helps restore correct piston alignment and can improve compression stability during tuning work. Handle circlips with care, do not force the pin, and adhere to the engine manufacturer's guidance for clearances and lubrication practices.