O.S. Engine OS28703100 Cylinder Liner 105HZ for RC engines  [OS28703100]

Cylinder liner 105HZ overview

This cylinder liner is an RC-scale replacement sleeve intended for engine rebuilds and maintenance, identified by model OS28703100. It serves as the wear surface for the piston and is designed to restore compression and running consistency during engine overhaul or part refresh.

When replacing a cylinder liner, confirm bore condition and piston fit before final assembly. Clean mating surfaces, check for burrs or scoring, and verify concentricity of the liner within the engine case. Proper alignment and a light, even press fit are critical to avoid distortion of sealing surfaces.

During reassembly use appropriate high-temperature lubricants on the liner and piston for initial run-in. Break-in procedures should be conservative: monitor temperature and run quality, and make incremental tuning adjustments to carburetion and ignition as needed after the liner has seated.

For routine maintenance inspect the liner for visible wear, pitting, or glazing; replace the liner if there is measurable loss of bore integrity or if the piston shows scuffing that cleaning cannot remove.

Use this liner as a direct replacement during RC engine rebuilds, focusing on careful fitment and conservative break-in to protect the piston and connecting components.