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OS 25 FX Control line or Free Flight engine and RC if you remove the venturi and install a carburetor. Very nice engine that is very clean. Engine is complete with glow plug (which lights up), venturi, K&B needle valve assembly, and prop washer and prop nut. Compression is very good, bearings are smooth and quiet, and there is no perceptible wear in any of the moving parts. There is no damage of any kind but the mounting holes have been enlarged. Engine starts easily either hot or cold and it turns an APC 8-6 prop at 15,400 RPM and an APC 10-4 prop at 12,900 RPM.
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