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OS 15 FP Control line or Free Flight engine and RC if you remove the venturi and install a carburetor. This engine has true ABC construction instead of ABN like most of the OS engines. Very nice low time engine that is very clean. Engine is complete with glow plug, venturi, Super Tigre type needle valve assembly, and prop washer and prop nut. Compression is very strong and there is no perceptible wear in the crankshaft bushing or any of the other moving parts. There are some very tiny nicks in the front of the cooling fins on the cylinder head and the mounting holes have been enlarged.
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