O.S. Engines FS-120S-E Surpass Ringed 4-Stroke w/o Pump OSM35530
OSM35530 O.S. FS-120S-E Surpass w/o Pump

O.S. Engines FS-120S-E Surpass Ringed 4-Stroke w/o Pump OSM35530

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O.S. Surpass series of 4-stroke model engines have 30% larger intake valves than the FS series. Ringed piston. Rear-mounted updraft carburetor. Helix gear-driven camshaft. Ball bearing-supported camshaft and crankshaft. Covered under 2-YEAR WARRANTY. This product includes one assembled FS-120 Surpass w/carb and no pump. One #F glow plug. One exhaust header. One exhaust muffler. One choke valve extension. One set of instructions, poster, and decals. (Wrenches, Choke Valve Extension, and Mounting Template Are No Longer Included per O.S.)


Fuel: 5%-15% nitromethane with 18% lubricant. Synthetic, castor, or a synthetic/castor blend may be used. NOTE: Certain four-cycle fuels cannot be used due to low oil content. However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15% may be used b

Bore: 31mm (1.22")
Stroke: 27.5mm (1.08")
Power Output: 1.9 PS, 1.87HP at 11,000 RPM
Weight-Without Muffler: 30.5oz (864g)
Weight-With Muffler: 33.3oz (944g)
Practical RPM Range: 2,000 - 11,000 RPM
Crankshaft Thread Size: 5/16-24
Valve Clearance: Between .04mm and .1mm (or between .0015" and .004", measured between the valve tip and rocker arm)
Length: 104mm (4.09") from backplate to the front of drive washer
Width: 47mm (1.85") width of engine neglecting the mounting flanges
Width: 58mm (2.28") distance between the mounting hole centers
Height: 138.5mm (5.45")
Suggested Prop(s): 13x11, 13x12, 14x10, 14x11, 15x8, 16x6, 16x7, 17x6
Construction: Aluminum and Aluminum alloys

Needle Settings
High Speed: 2.5 - 3 turns out from fully closed
Low Speed: Edge of larger sleeve centered, looking down the neck of the carb

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