O.S. Engine OS49403300 Cylinder GF40 replacement cylinder part for GF40 engines  [OS49403300]

Cylinder for GF40 engines

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 presented as the cylinder element itself and focuses on restoring proper compression and piston fit where the original cylinder shows wear or damage.

For model-level clarity: this component is identified by the product name and model number, and is intended as an engine-scale accessory for RC applications only. When replacing a worn cylinder, the component’s role is to re-establish correct piston travel, sealing, and alignment within the engine case to support reliable running and tuning.

Installation notes: remove the carburetor and cooling head, extract the piston assembly and inspect the crankcase and bearings for wear before fitting the new cylinder. Use appropriate gaskets and follow standard RC engine reassembly practice, ensuring correct piston-to-cylinder clearance and secure torque on the head screws to maintain compression.

As a replacement cylinder labeled OS49403300, this part is intended to restore mechanical integrity to GF40 engine builds and support routine maintenance and tuning for RC nitro models that use the GF40 engine family.