Replacement Piston Ring for GT60 - OS28603400 O.S. Engine  [OS28603400]

GT60 Piston Ring Technical Notes

This O.S. Engine piston ring is sold as part number OS28603400 and is intended for GT60-series RC model engines. It serves to re-establish cylinder sealing after disassembly and during scheduled maintenance.

Fit and function: the ring is sized to O.S. Engine standards for the GT60 range, restoring compression and helping the engine run predictably after a rebuild. Change the component when scoring or excessive wear is evident on piston or liner surfaces.

Installation overview: replace the piston ring during a controlled engine strip, inspect mating surfaces for damage before refitting, fit the ring with care and verify the end gap meets the recommended tolerances, then reassemble and run-in the engine according to normal RC break-in practice. This guidance is for model engine use only.

Tuning role: a correctly fitted piston ring maintains stable compression and therefore supports consistent needle settings and repeatable power output during tuning and on-track use. Renewing a worn ring is a common step when restoring engine response for precise tuning.