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instruction manual, so as to familiarize particularly in the case of four-stroke-cycle engines. The O.S. FS-120S-E is an aircooled, overhead-valve four-. View and Download O.S. engine FS-120S-E owner's instruction manual online. section on pages 2-4 of this booklet and to PARTS The O.S. FS-120S-E is an aircooled, overhead-valve four- stroke-cycle engine for model aircraft use. The FZ120 was designed for the pattern competiton, scale and large sports models. 4 cycle engines. Glow plug We recommend the OS Type F plug for.15 May 2013 17 Oct 2011 Glow Engines - Need info on old OS 120 four stroke - I recently acquired an old OS 120 four stroke engine. It has dual rocker Not a powerhouse, but no 4 strokes in the early 80s were. Scott, emailed you regarding manual. FS-120 III Surpass Ringed 1.20 4-Stroke with Pump OSMG0935 OS Engines Parts for All Airplane Engines, Airplane Engines, O.S. Engine Horizon Hobby. I have the OS four stroke glow plug and would highly recommend it. Fantastic motor and yes I . Manual for XL 120 RFS RC 4-Stroke Engin, Download [705]. To maintain the four-stroke engine's reduced noise levels, the. FS-1203 is supplied with an O.S. Type F-5020 baffled silencer. (muffler) of substantially enlarged Discussion Plumbing an OS 1.20 pumped 4 stroke Engines. Do you have the manual? If not give me a PM with your On one side of the crankcase it says OS 120 Surpass and the other side it says OS FS series. I test ran it