O.S. Engine OS28603400 GT60 Piston Ring for Model Engine Servicing  [OS28603400]

Piston Ring Overview for GT60

This O.S. Engine piston ring, reference OS28603400, is a direct-fit replacement for GT60-series RC model engines. It is intended to restore the cylinder seal as part of regular servicing or a full engine rebuild.

Fit and function: manufactured to the dimensional standards used by O.S. Engine for the GT60 family, the ring brings back compression and helps deliver predictable running after reassembly. Replace the ring if you observe scoring, loss of compression, or other wear on the piston or cylinder liner.

Installation overview: fit the piston ring during a controlled teardown, examine the piston crown and cylinder wall for damage before reassembly, place the ring onto the piston with care and check the end gap against recommended tolerances, then reassemble and perform the standard engine run-in. This information is aimed at RC model use only.

Tuning role: restoring the piston ring seal helps stabilise compression, which supports consistent needle adjustments and repeatable power delivery when tuning. Changing a worn ring is a routine maintenance action when preparing an engine for precise setup.