| Features
O.S. FS-120 III Surpass 4-Stroke
w/Pump OSMG0935
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 this series
gaining 30% more power than the previous FS series.
 Features
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O.S. FS-120 III Surpass
4-Stroke w/Pump OSMG0935
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Specially developed PD-07 pump
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New 70N carb
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Ball bearing-supported
camshaft and crankshaft
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New F-5020 Silencer
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Two year warranty
Specifications
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Bore: 30.4mm (1.20")
-
Stroke: 27.5mm (1.08")
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Power Output: 2.1 BHP at
12,000 RPM
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Practical RPM Range: 2,000 -
12,000 RPM
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Weight-Without Muffler: 32.5oz
(921g)
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Weight-With Muffler: 35.3oz
(1000g)
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Crankshaft Thread Size:
5/16-24
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Valve Clearance: Between .04mm
and .1mm (or between .0015" and .004", measured between the valve tip and
rocker arm)
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Length: 102mm (4.09") from
backplate to the front of the drive washer
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Width: 47mm (1.85") width of
engine neglecting the mounting flanges 58mm (2.28") distance between the
mounting hole centers
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Height: 139.5mm (5.49")
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Suggested Prop(s): 14x9,
14x10, 14x11, 15x8, 15x9, 15x10, 16x6,
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Construction: Aluminum and
Aluminum alloys
Package Contents
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One Assembled Engine
w/Carburetor and #F Glow Plug
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One Muffler w/Manifold
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One Set of Instructions, O.S.
Poster, and Decal
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(Mounting Template Is No
Longer Included per O.S.)
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One additional coarse needle
for less sensitive carb adjustment.
Requirements
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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.
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When choosing fuels for this
engine, the modeler must be sure to select a fuel with at least a 18%
lubricant content.
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Starting and Field Equipment.
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Propeller (see SPECS)
Comments
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Some differences between
2-Stroke and 4-Stroke engines: 4-Strokes are quieter. 4-Strokes get better
Fuel Economy 2-Strokes generate More RPM (11,000-13,000 RPM with prop and
4-Strokes rev to around 9,500 RPM) 4-Strokes generate much more torque and
will swing a larger prop. 4-Strokes have a more realistic sound, like a real
aircraft engine.
-
The new Surpass engines
(Version II and III) have more power than their predecessors and they also
have more corrosion prevention on the inside of the crankcases.
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