This is one of the O.S. Surpass series of 4-stroke model engines.
The Surpass series is the 2nd series of 4-stroke engines (The 1st series was
the FS series, discontinued and replaced by the Surpass series around 1986-7).
"Surpass" refers to the fact that this series gained 30% more power than the
previous FS series.

FEATURES: 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.

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.)

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.
          Starting and Field Equipment.
          Propeller (see SPECS)

SPECS:    Bore: 30.4mm (1.22")
          Stroke: 27.5mm (1.08")
          Power Output: 1.9 BHP at 11,000 rpm
          Weight: w/o muffler--30.5 oz   w/ muffler--31.17 oz
          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
                 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

COMMENTS: Some differences between 4-Stroke and 2-Stroke engine.
            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.
                                                                    JBN 7/20/93
                                                                          ir/jl