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ENGINE REVIEW O.S. 81 FS-A
PHOTOS BY PETE HALL This powerful 4-stroke will give your scale or aerobatic plane power to spare A view ìunder the hoodî showing the valves and rocker arms. The piston features a ring for easy starting and long life. The connecting rod is very robust. O.S. ENGINES HAS ALWAYS BEEN on the forefront of engine development by producing powerful and reliable powerplants. The latest ìAlphaî series engine from O.S. Engines is the 81 FS-a, which...
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