O.S. FS-30 Surpass Ringed 4-Stroke w/Muffler

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This is a FS-30 Surpass Four-Stroke Model Aircraft Glow Engine.
                     Great for Scale and Sport models.

FEATURES: Rear-mounted updraft carburetor
          Helix gear-driven camshaft supported by bronze bushings
          Ball bearing-supported crankshaft
          Ringed piston
          Two Year Warranty

INCLUDES: One FS-30 Four-Stroke engine
          #F Four-Stroke Glow Plug

          One Muffler w/Header Pipe
          Instructions

REQUIRES: Fuel: 5%-15% nitormethane 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 a 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:    Displacement: 4.89cc (.299 cu in)
          Bore: 19.5mm (.767")                     Stroke: 16.4mm (.648")
          Power Output: .5 HP at 10,000 RPM
          Weight with muffler: 10.4oz (295g)
          Weight without muffler: 9.8oz (278g)
          Practical RPM Range: 2,500 - 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: 84mm (3.31") from backplate to front of Drive Washer.
          Width:  29mm (1.14") width of engine neglecting the mounting flanges
                  36mm (1.42") mounting holes side-to-side on-center
          Height: 86.5mm (3.41")
          Suggested Prop(s): 9x6, 9x7, 10x4, or 10x6
          Construction: Aluminum and aluminum alloys

          Needle Settings: High Speed: 2 - 2.5 turns out from fully closed
                           Low Speed (air bleed screw): tip of screw 1/2 way
                                       across the small hole in the back of the
                                       carb

COMMENTS: Some differences between a 4-stroke and 2-stroke engine:
           A 4-stroke is quieter
           A 4-stroke gets better fuel economy
           A 2-stroke generates more RPM (11,000-13,000 RPM with prop
            while 4-strokes rev to around 9,500 RPM)
           A 4-stroke generates much more torque and will swing a larger prop
           4-strokes sound realistic (sounds like a REAL aircraft engine)