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

GF40 Cylinder Replacement Overview

This cylinder is a direct replacement part listed as O.S. Engine OS49403300 Cylinder GF40, intended for use with GF40-series RC nitro engines. It is supplied as the cylinder component only and is intended to restore correct compression and piston seating when the original cylinder shows wear or damage.

For clarity at the model level: this part is identified by the product name and model number, and is intended as an engine service component for RC applications. When fitting a replacement cylinder, the goal is to re-establish correct piston travel, sealing, and alignment inside the case to support dependable running and tuning.

Installation notes: remove the carburetor and cooling head, withdraw the piston assembly and inspect the crankcase and bearings for wear prior to fitting the new cylinder. Use suitable gaskets and follow standard RC engine reassembly practice, confirm piston-to-cylinder clearance, and torque the head screws correctly to maintain compression.

Sold as the replacement cylinder OS49403300, this component is intended to restore mechanical integrity to GF40 engine builds and support scheduled maintenance and tuning for RC nitro models using the GF40 engine family.