RC Cylinder Liner 105HZ Replacement Sleeve - O.S. Engine OS28703100  [OS28703100]

105HZ cylinder liner - product summary

This cylinder liner is a precision replacement sleeve for RC engine overhauls, listed as model OS28703100 from O.S. Engine. It provides the wear surface for the piston and is used to restore compression and consistent running when refreshing the engine internals.

Before installation inspect the crankcase bore and piston skirt for damage and confirm piston-to-liner clearance at several heights. Remove any burrs or scoring and ensure the liner will sit evenly; a true, light press fit is important to keep sealing surfaces concentric.

When reassembling apply a thin film of high-temperature assembly lubricant to the liner bore and piston to aid initial seating. Adopt a conservative break-in routine: watch temperature and running quality closely, and adjust carburetion and ignition in small steps after the liner has settled.

For routine checks look for glazing, pitting, or visible scuffing; measurable loss of bore integrity or recurring poor running despite tuning are signs the liner should be replaced.

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