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-Without Muffler: 30.5oz (864g)
Weight-With Muffler: 33.3oz (944g)
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 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.