Full Cylinder & Piston Assembly for 12TG Engines - OS21413000 by O.S. Engine  [OS21413000]

Matched Cylinder & Piston Unit for 12TG Engines

This matched cylinder and piston assembly carries the model number OS21413000 and is intended for maintenance and overhaul of 12TG-series RC glow engines. The write-up concentrates on correct fitment, service use, and setup consequences rather than performance promises.

Replace the cylinder and piston together if you observe scoring, poor compression, or irregular combustion. The matched unit restores bore-to-piston clearances and combustion chamber profile typical of 12TG engines.

Installation reminders: confirm piston orientation and ring seating, carry over any required gaskets or needle-valve shims, and follow your engine break-in steps. Verify head clearance and glowplug seating once fitted.

Tuning considerations: swapping this assembly can modify compression ratio and running feel; check and adjust idle and mid-range needle settings during initial run-in sessions.

As a workshop replacement, this unit supplies the matched components to recover compression and mechanical fit on 12TG engines; confirm clearances and perform a controlled break-in procedure.