FS91II Ring 60P Carburetor

This is the FS-91II Surpass 4-Stroke Engine.

This engine does not use a choke valve OR use a return fuel line to the tank.
THERE ARE NO TOOLS OR EXTRA NEEDLE VALVE AS STATED IN THE INSTRUCTIONS.

FEATURES: New rear-mounted updraft 60P Carb Intake Manifold and Coverplate.
Helix gear-driven camshaft supported by ball bearings.
Ringed piston.
Does Not use choke valve but instead an electric starter to start.
Grease-packed twin-sealed corrosion-resistant rear ball bearing.
Two Year Warranty

INCLUDES: One Assembled Engine w/Carburetor.
One type #F Glow Plug.
One Muffler w/Manifold.
One Set of Instructions 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 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.
Propeller (see SPECS)
Starting and Field Equipment

SPECS: Bore: 27.7mm (1.09")
Stroke: 24.8mm (.976")
Displacement: 14.95cc (0.912 cubic inch)
Power Output: 1.6 BHP at 11 000 RPM
Practical RPM Range: 2 000 - 12 000 RPM
Crankshaft Thread Size: 5/16-24
Weight-With Muffler: 24.2oz (686g)
Weight-Without Muffler: 22.6oz (641g)
Valve Clearance: Between .04mm and .1mm (or between .0015" and .004"
measured between the valve tip and rocker arm)
Length: 91.5mm (3.60") from backplate to front of drive washer.
Width: 42.6mm (1.68") width of engine neglecting the mounting flanges
52mm (2.05") distance between the mounting hole centers
Height: 123mm (4.88")
Suggested Prop(s): Stunt planes: 11X11-12 12X10-12 13X9
Scale models: 13.5X8 14X7 15X6 16X6 (12X8 & 12.5X7-3 blade)
Construction: Aluminum and Aluminum alloys

COMMENTS: A fuel tank of approximately 300cc capacity is suggested. This allows
up to 12-13 minutes flying time.
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.
OS no longer includes the gauges tools and choke valve extension.

The new Surpass engines (Version II and III) have more power than
their predecessors and also have more corrosion prevention
on the inside of the crankcases.
Although it is cost prohibitive you can convert this to the pump
version OSMG0890 using the following items:
- OSMG2533 45983000 CARB #60N FS-91-P
- OSMG6491 45968000 INT PIPE ASSY FS91-P
- OSMG2230 72508001 PUMP UNIT PD-07
- OSMG4153 45907010 COVER PLATE FS91-P