This is a FS-91 Surpass 4-stroke Engine with Pump Unit. This engine does not use a choke valve OR 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 60N carb w/pressure regulator. New rear-mounted PD-07 pump unit. 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 #F Glow plug. One Muffler w/Manifold. One Set of Instructions, O.S. Poster, 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 lubricant 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 due to its 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. Starting and Field Equipment. Propeller (see SPECS) 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 Weight-Without Muffler: 22.9oz (649g) Weight With Muffler: 24.6oz (697g) Practical RPM Range: 2,000 - 12,000 RPM Crankshaft Thread Size: 5/16-24 Valve Clearance: Between .04mm and .10mm (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 centers of the mounting holes Height: 123mm (4.88") Suggested Prop(s): Stunt planes: 11x10, 11x11, 12x9.5, 12x10, 12x11 Scale models: 13.5x8, 14x7, 15x6, 16x6, (12x8 & 12.5x7-3 blade) Construction: Aluminum and Aluminum alloys REQUIRES: Fuel with 5%-15% Nitromethane and 18% (minimum) oil content USE 4-STROKE FUEL (all 5%-15% fuels we carry meet these requirements) COMMENTS: A fuel tank of approximately 300cc capacity is suggested. This allows for 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 larger Props. 4-Strokes have a realistic Sound, like a Real Aircraft Engine. JAL 9/12/97 ir/jl updated jpg 1/10/06 COMMENTS: O.S. 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 more corrosion prevention on the inside of the crankcases.
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