12TG Cylinder & Piston Assembly Replacement - OS21413000 by O.S. Engine  [OS21413000]

Direct Replacement Cylinder & Piston for 12TG

This cylinder and piston assembly is a direct replacement unit identified by model OS21413000 and intended for use with 12TG-series RC glow engines. The description emphasizes correct fitment, service purpose, and setup impact rather than making performance claims.

Use this assembly when the original cylinder or piston shows wear, scoring, or loss of compression. The part replaces both cylinder and piston as a matched unit to restore mechanical clearance and combustion chamber geometry typical to 12TG engines.

Installation notes: confirm piston orientation and ring seating, transfer any required gaskets or needle-valve shims from the old assembly, and follow break-in procedures recommended by your engine maintenance routine. Check for proper head clearance and safe glowplug fit after assembly.

Tuning role: replacing the cylinder and piston affects compression ratio and running characteristics; expect to verify idle mixture and mid-range needle settings after installation and during the initial running period.

For workshop use this assembly provides the matched components needed to restore engine compression and mechanical fit on 12TG engines; verify engine-specific clearances and perform a controlled break-in after fitting.