Cylinder Liner OS28703100 105HZ Replacement for RC Engines by O.S. Engine  [OS28703100]

What this 105HZ liner does

The OS28703100 sleeve from O.S. Engine is supplied as a single replacement liner for engine overhauls. It reestablishes the contact surface for the piston, helping to recover compression and smoother operation after bore wear.

When fitting, verify the crankcase bore condition and piston dimensions. Ensure mating surfaces are clean and free of burrs, and confirm the liner will seat true and concentric to avoid distorting sealing surfaces when pressed into place.

Apply an appropriate high-temperature assembly lubricant to the liner and piston for initial run-in. Use a cautious bedding-in routine: keep an eye on temperatures and engine smoothness, and perform small tuning tweaks only after the liner has bedded.

Inspect during servicing for signs of scoring, pitting, or glazing; replace the sleeve if compression is lost or piston wear is evident after normal tuning efforts.

This sleeve is intended as the specified replacement part for engine rebuilds; careful installation and conservative break-in will help protect the piston and related components.