O.S. FS-91 II Surpass Ringed 4-Stroke

    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.
          No longer utilizes a choke valve
          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%
            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

          Needle Settings: High Speed: 1.5 turns out from fully closed
                           Low Speed:  2.5 turns out from fully closed with the
                                       throttle fully closed