GT60 Piston Ring OS28603400 Compatible with GT60-Series Engines by O.S. Engine  [OS28603400]

Piston Ring Spec for GT60 Engines

This O.S. Engine piston ring carries the part number OS28603400 and is made specifically for GT60-series radio-controlled model engines. It functions as a replacement sealing ring used when rebuilding the power unit.

Fit and function: manufactured to O.S. Engine tolerances for GT60 engines, the ring restores compression and aids in returning consistent running characteristics after disassembly. Replace the component when wear, scoring, or a loss of compression is found on the piston or cylinder liner.

Installation overview: change the piston ring during a controlled teardown, thoroughly inspect piston and cylinder surfaces, fit the ring carefully onto the piston and verify the end gap against the recommended values, then reassemble and carry out the usual run-in routine for RC engines. This note applies to model engine use only.

Tuning role: a correctly installed ring keeps compression stable, helping with predictable needle adjustments and steady throttle response during tuning and practice sessions. Fitting a fresh ring is a normal procedure when preparing an engine for fine tuning.