105HZ Cylinder Sleeve Upgrade for RC Engines OS28703100 - O.S. Engine  [OS28703100]

Product brief: 105HZ sleeve

The OS28703100 cylinder liner from O.S. Engine is a single replacement sleeve intended for engine rebuilds, providing the piston contact surface and helping to reestablish compression and stable running after wear.

Check the crankcase bore and piston dimensions before installation. Remove any burrs, ensure the mating surfaces are clean, and confirm the liner will seat concentrically to prevent distortion of the sealing faces during press fit.

Use a light, high-temperature assembly lubricant on the piston and inside the liner for the initial running period. Follow a conservative break-in: run at moderate loads, monitor temperature, and make incremental tuning adjustments as the liner beds in.

Inspect periodically for glazing, pitting, or scuff marks; persistent loss of compression or uneven piston wear indicates the liner should be replaced.

Fit this liner as the specified replacement during engine overhaul and use a careful break-in to protect the piston and small end components.