This is a FS-52 Surpass Four-Stroke Model Aircraft Glow Engine.

FEATURES: Rear-mounted updraft carburetor
          Helix gear-driven camshaft
          Ball bearing-supported camshaft and crankshaft
          Ringed piston
          Two year warranty

INCLUDES: One assembled Engine w/Carburetor and #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 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:   23.0mm (.906")
          Stroke: 20.6mm (.811")
          Weight: 402 g (14.19 oz)
          Power Output: .90 BHP at 12,000 rpm
          Practical RPM Range: 2,300 - 13,000 rpm
          Crankshaft Thread Size: 1/4-28
          Valve Clearance: Between .04mm and .1mm (.0015" and .004")
            Measured between the valve tip and rocker arm.
          Length: 80.5mm (3.17") from backplate to front of the drive washer.
          Width:   34mm (1.33") width of engine neglecting the mounting flanges
                   44mm (1.73") side-to-side mounting holes on-center
          Height: 101mm (3.97")
          Prop(s): 10X8,10X9,10.5X8,10.5X9,11X6,11X7,11X7.5,12X5,12X6,12.5X6
          Construction: Aluminum and Aluminum alloys

COMMENTS: For the helicopter version, use OSMG1952.
          The Surpass series is the 2nd series of 4-stroke engines. The 1st
            FS series was replaced by the Surpass series around 1987.
            "Surpass" refers to this series gaining 30% more power than the
            previous FS series engines.
          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.
                                                                          ir/jl