GF40 Cylinder Service Part OS49403300 Compatible with GF40 Engines by O.S. Engine  [OS49403300]

GF40 Engine Cylinder Details

The item is a replacement cylinder listed as O.S. Engine OS49403300 Cylinder GF40, meant for GF40-series RC nitro engines. It is supplied as the standalone cylinder unit and is intended to renew correct compression and piston alignment when the factory cylinder is worn.

Model-level note: the component is identified by the model number and product name and is intended for RC engine service use. Installing a new cylinder restores piston travel, sealing, and correct alignment inside the crankcase to support reliable running and tuning adjustments.

Fitting guidance: remove the carburetor and cooling head, take out the piston assembly and inspect the crankcase and bearings for signs of wear before installing the replacement cylinder. Use correct gaskets and follow established engine reassembly practice, checking piston-to-cylinder clearance and ensuring head screws are torqued to spec.

Marketed as the OS49403300 replacement cylinder, this part supports maintenance and rebuilds for GF40 engine installations within RC nitro models.