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

Service Cylinder and Piston Assembly for 12TG

This matched cylinder and piston assembly is catalogued as OS21413000 and is suitable for 12TG-series RC glow engines. The write-up highlights fitment, service role, and practical setup implications rather than claiming improved performance.

Fit this assembly when the original parts show wear, scoring, or diminished compression. Supplied as a matched set, it reinstates the intended mechanical clearances and combustion chamber shape used in 12TG engines.

Installation advice: ensure correct piston orientation and ring seating, transfer any necessary gaskets or needle-valve shims, and follow a controlled break-in sequence recommended by your maintenance practice. Confirm head clearance and glowplug fitment after assembly.

On tuning: replacing the cylinder and piston will change compression and engine behavior; check idle and mid-range needle settings during the initial running period and make incremental adjustments.

For workshop replacement this matched assembly provides the components needed to recover compression and mechanical fit on 12TG engines; always verify clearances and carry out a careful break-in.