GF40 Replacement Cylinder OS49403300 — Cylinder Part for GF40 Engines by O.S. Engine  [OS49403300]

Replacement Cylinder — GF40 Engines

This component is offered as the O.S. Engine OS49403300 Cylinder GF40 and is intended for GF40-series RC nitro engines. It is supplied as the cylinder itself, intended to replace a worn or damaged unit and restore correct compression and piston fit.

Part identification: the product carries the model number and name for clarity and is intended solely as an engine service component for RC use. Installing the replacement restores piston travel, improves sealing, and returns the assembly to proper alignment within the engine case to aid reliable operation and tuning.

Fitting tips: remove the carburetor and cooling head, take out the piston assembly, and examine the crankcase and bearings for wear prior to fitting the new cylinder. Fit new gaskets as needed and follow accepted reassembly practice, verify piston-to-cylinder clearance, and torque the head screws evenly.

As the OS49403300 replacement cylinder, this part is intended to bring GF40 engine assemblies back to reliable mechanical condition and assist in routine tuning and maintenance.