O.S. Engine OS29121400 Gasket Set 120AX  [OS29121400]

Gasket set for 120AX RC engines

This gasket set is an RC-scale replacement kit intended for the 120AX engine family, supplied under the O.S. Engine part number OS29121400. It serves as the sealing pack used when performing engine teardown, inspection, or rebuild on compatible 120AX units.

Compatibility is limited to 120AX-design engines by model designation, use the exact model code when matching parts. The set’s purpose is to restore proper sealing between mating surfaces such as the crankcase, head, and backplate during maintenance intervals or after component replacement.

Installation guidance: ensure all mating surfaces are clean and free of old gasket residue, inspect for warpage or damage before fitting new gaskets, and follow O.S. Engine torque and assembly specifications for fasteners during reassembly. Proper sealing helps maintain compression and consistent engine behaviour under varying tuning settings.

Performance role: while gaskets do not change tuning parameters directly, correct sealing is essential for stable compression and predictable needle-valve response, so replacing worn gaskets is a standard part of maintaining engine consistency during tuning and race preparation.