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Instruction Manuals:	Manual 1 (1.3 MB)
Tower Catalog Page:	197
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           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)

          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

          Needle Settings: High Speed: 1.5 turns out from fully closed
                           Low Speed:  2 turns out from fully closed with the
                                       throttle fully closed

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
                                                               updt lmm 3/31/09

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.



– If you need more information, use these O.S. resources –

Click Here: Manufacturer's Product Web Page
E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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