GT60 Piston Ring Replacement - OS28603400 for RC Model Engines by O.S. Engine  [OS28603400]

GT60 Series Piston Ring Details

This O.S. Engine piston ring is a direct replacement part labeled OS28603400 and intended specifically for use with GT60-series RC model engines. As an RC-scale accessory, it restores cylinder sealing during engine rebuilds and scheduled maintenance.

Fit and function: the ring is produced to O.S. Engine dimensional criteria for the GT60 family, bringing back compression and predictable running after disassembly. The item is recommended for periodic replacement when wear or scoring is seen on the piston or cylinder liner.

Installation overview: install the piston ring during a controlled engine teardown, inspect the piston crown and cylinder for wear before reassembly, fit the ring to the piston carefully and check the ring end gap to the manufacturer's tolerances, then reassemble and perform a standard run-in procedure. This description is intended for RC model use only.

Tuning role: a properly seated piston ring maintains consistent compression, which supports steady needle response and repeatable power delivery during tuning and track sessions. Replacing a worn ring is a routine maintenance step when restoring performance or preparing an engine for precise tuning.