SPEED 19XZ-B Piston Pin Replacement - O.S. Engine OS21956000  [OS21956000]

Pin purpose and correct fitment

This piston pin is an RC replacement identified as O.S. Engine OS21956000 and made to suit SPEED 19XZ-B engine assemblies. It provides the mechanical link between piston and connecting rod and is supplied as a direct service component for maintenance and rebuild tasks.

Install the pin during top-end servicing: follow the engine maker's disassembly steps, check piston and rod bore condition, then press the pin through the piston and rod using a suitable arbor or a light press. Do not hammer the pin directly to avoid scoring, and ensure circlip retainers or equivalent fasteners are fully seated after fitting.

For lasting reliability, concentrate on clean contact surfaces and correct circlip seating rather than changing pin dimensions. Use assembly lubricant at installation and monitor for proper rotation during break-in to limit wear on piston and rod bores.