Product Information
O.S Engine FS-91 II Surpass #35920

FS91II Ring 60P Carburetor 

This is the FS-91II Surpass 4-Stroke Engine. This engine does not use a choke valve OR use a return fuel line to the tank. THERE ARE NO TOOLS OR EXTRA NEEDLE VALVE AS STATED IN THE INSTRUCTIONS. FEATURES: New rear-mounted, updraft 60P Carb, Intake Manifold, and Coverplate. Helix gear-driven camshaft supported by ball bearings. Ringed piston. Does Not use choke valve, but instead an electric starter to start. Grease-packed twin-sealed corrosion-resistant rear ball bearing. Two Year Warranty INCLUDES: One Assembled Engine w/Carburetor. One type #F Glow Plug. One Muffler w/Manifold. One Set of Instructions and Decal. (Wrenches, Choke Valve Extension, and Mounting Template Are No Longer Included per O.S.) REQUIRES: 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% (CATP9109) may be used because it has 18% oil content. When choosing fuels for this engine, the modeler must be sure to select a fuel with at least a 18% lubricant content. Propeller (see SPECS) Starting and Field Equipment SPECS: Bore: 27.7mm (1.09") Stroke: 24.8mm (.976") Displacement: 14.95cc (0.912 cubic inch) Power Output: 1.6 BHP at 11,000 RPM Practical RPM Range: 2,000 - 12,000 RPM Crankshaft Thread Size: 5/16-24 Weight-With Muffler: 24.2oz (686g) Weight-Without Muffler: 22.6oz (641g) Valve Clearance: Between .04mm and .1mm (or between .0015" and .004", measured between the valve tip and rocker arm) Length: 91.5mm (3.60") from backplate to front of drive washer. Width: 42.6mm (1.68") width of engine neglecting the mounting flanges 52mm (2.05") distance between the mounting hole centers Height: 123mm (4.88") Suggested Prop(s): Stunt planes: 11X11-12, 12X10-12, 13X9 Scale models: 13.5X8, 14X7, 15X6, 16X6, (12X8 & 12.5X7-3 blade) Construction: Aluminum and Aluminum alloys COMMENTS: A fuel tank of approximately 300cc capacity is suggested. This allows up to 12-13 minutes flying time. Some Differences Between 4-Stroke and 2-Stroke Engines; 4-Strokes are Quieter. 4-Strokes get Better Fuel Economy. 2-Strokes Generate More RPM (11,000-13,000 RPM with Prop while 4-Strokes rev to around 9,500 RPM) 4-Strokes generate much more Torque and will Swing a larger Prop. 4-Strokes have a realistic Sound; like a Real Aircraft Engine. OS no longer includes the gauges, tools, and choke valve extension. The new Surpass engines (Version II and III) have more power than their predecessors and also have more corrosion prevention on the inside of the crankcases. Although it is cost prohibitive, you can convert this to the pump version OSMG0890 using the following items: - OSMG2533 45983000 CARB #60N FS-91-P - OSMG6491 45968000 INT PIPE ASSY FS91-P - OSMG2230 72508001 PUMP UNIT PD-07 - OSMG4153 45907010 COVER PLATE FS91-P  

Retail Price: $449.99

Our Price: $324.99

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