Replacement Copper Gasket Compatible with #731 OS FSa-110-P - Hatroi HA244  [HA244]

Fitment notes for OS FSa-110-P assemblies

This Hatroi HA244 copper gasket is an RC replacement specified for use with the #731 OS FSa-110-P assembly. The washer is a plain copper sealing component designed to reestablish metal-to-metal contact where the original gasket has worn or been removed during engine maintenance.

Compatibility applies only to the stated model reference, so visually confirm the gasket outline and hole pattern before installation. When replacing the gasket, clean both mating faces of residue and old material, seat the gasket flat, and tighten head fasteners evenly in a cross pattern to avoid distorting the head. Use suitable hand tools and do not over-torque to protect threads typically found on RC engines.

As a service item the copper gasket restores sealing that supports stable compression and reliable starting behavior on nitro RC engines. It is a simple spare useful for routine rebuilds and quick maintenance without altering the engine's core geometry.