Surpass Series

O.S. developed the Surpass Series of 4-stroke engines for discerning fliers who demand more power. Able to wing larger props and supply more usable horsepower, Surpass 4-strokes provide the best performance for your plane, regardless of scale or flying style.

• All Surpass engines feature a helix gear-driven camshaft on the front end and dependable updraft carburetor in the back.
• All include glow plug and standard silencer.

FS-40S

Part No. OS MG0845 Displacement: 0.396 Bore: 0.835 Stroke: .0724 RPM: 2,200-12,000 Output: 0.65 @12,000 Weight: 12.50 Recommended Props: 10x7.5, 11x6, 12x5-6 Muffler: yes CART  ADD  Price $219.99* Prices with * Include Ground Freight (48 states).

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FS-56-a

Ushering in a new era in O.S. 4-stroke technology: the FS-56-a. It's the first in the alpha series, with the latest advancements for boosting your plane's performance.

• Mounts with no-mod ease in the same space as the FS-52.
• In addition to less noise, the muffler features a multi-positional manifold with a rubber O-ring that helps prevent oil leakage.
• A newly designed lubrication system eliminates the need for crankcase ventilation.
• The 40NA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.

Part No. OS MG0956 Displacement: .569 Bore: .945 Stroke: 0.811 RPM: 2,400-13,000 Output: 1.0 @ 10,000 Weight: 16.26 Recommended Props: 13x6, 12x6-8, 13x6-7 Muffler: yes CART  ADD  Price $284.99* Prices with * Include Ground Freight (48 states).

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81FS-a

Packing more power into 60-size planes!

• Mounts easily in the same space as the FS-70SII with no modifications.
• A rubber O-ring on the muffler's multi-positional manifold helps prevent oil leakage.
• The specially designed lubrication system eliminates the need for crankcase ventilation.
• The 60RA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow.

Part No. OS MG0981 Displacement: 0.809 cu in (13.26 cc) Bore: 1.091 in (27.7 mm) Stroke: 0.866 in (22.0 mm) RPM: 2,200-12,000 Output: 1.3 hp @ 11,000 rpm Weight: 19.63 oz (556 g) Recommended Props: Muffler: yes CART  ADD  Price $339.99* Prices with * Include Ground Freight (48 states).

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81FS-a w/ Pump

Now you can get the 81FS-a equipped with a fuel pump for even more consistent performance.

• Mounts easily in the same space as an FS-70II with no modifications
• Fuel is delivered consistently to the engine at all times, regardless of the plane's attitude, for more reliable performance.
• Ideal for aerobatics and other situations that demand high power.
• Feature the ingenious recirculation system that re-lubricates parts instead of venting the oil out into the cowl.

Part No. OS MG0982 Displacement: 0.809 cu in (13.26 cc) Bore: 1.091 in (27.7 mm) Stroke: 0.866 in (22.0 mm) RPM: 2,200-10,000 Output: 1.28 hp @ 10,000 rpm Weight: 20.11 oz (570 g) Recommended Props: Muffler: yes CART  ADD  Price $449.99* Prices with * Include Ground Freight (48 states).

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FS-91 Surpass II w/ Pump

Pump feature adds responsiveness to the FS-91 Surpass

• New regulating style pump, normally only found in 1.20 class engines, delivers better response and reliability
• Rear ball bearing is rubber-sealed on both sides and greased internally to help inhibit bearing corrosion
• The crankshaft, cam shaft and piston ring are all plated to further resist corrosion
• Features a reversible carb which allows the needle valve to face either the left or right side of the engine
• Black anodized rocker cover
• A large-volume muffler offers better noise reduction for milder sound
• PHOTO of back of engine

Part No. OS MG0890 Displacement: 0.912 cu in (14.95 cc) Bore: 1.091 in (27.7 mm) Stroke: 0.976 in (24.8 mm) RPM: 2,000-12,000 Output: 1.6 hp @ 11,000 rpm Weight: 23.9 (678g) Recommended Props: 13.5x8, 14x7, 15x6, 16x6 Muffler: yes & pump CART  ADD  Price $369.99* Prices with * Include Ground Freight (48 states).

Part No.	PHOTO	Description	CART	Price
SLI 4012		Muffler, Inverted Pitts OS .91 4-stroke, Slimline	ADD	$71.95
SLI 4012S		Muffler, Inverted Pitts with Smoke OS 91 4-stroke, Slimline	ADD	$79.95

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FS-91 II

Part No. OS MG0896 Displacement: 0.912 cu in (14.95 cc) Bore: 1.091 in (27.7 mm) Stroke: 0.976 in (24.8 mm) RPM: 2,000-12,000 Output: 1.6 hp @ 11,000 rpm Weight: Recommended Props: 13.5x8, 14x7, 15x6, 16x6 Muffler: yes CART  ADD  Price $299.99* Prices with * Include Ground Freight (48 states).

Part No.	PHOTO	Description	CART	Price
SLI 4012		Muffler, Inverted Pitts OS .91 4-stroke, Slimline	ADD	$71.95
SLI 4012S		Muffler, Inverted Pitts with Smoke OS 91 4-stroke, Slimline	ADD	$79.95

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FSa-110

Part No. OS MG0990 Displacement: 1.10 cu in (18 cc) Bore: 1.20 in (30.4 mm) Stroke: 0.98 in (24.8 mm) RPM: 2,000-11,000 Output: 1.8 hp @ 10,000 rpm Weight: 600g (19.2 oz) Recommended Props: 13x9-11, 14x8-10, 15x8, 16x8 Muffler: yes CART  ADD  Price $399.99* Prices with * Include Ground Freight (48 states).

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FSa-110 w/ Pump

Part No. OS MG0991 Displacement: 1.10 cu in (18 cc) Bore: 1.20 in (30.4 mm) Stroke: 0.98 in (24.8 mm) RPM: 2,000-11,000 Output: 1.8 hp @ 10,000 rpm Weight: 610g (21.52 oz) Recommended Props: 13x9-11, 14x8-10, 15x8, 16x8 Muffler: yes CART  ADD  Price $479.99* Prices with * Include Ground Freight (48 states).

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FS-120S-E

Part No. OS MG0930 Displacement: 1.1218 Bore: 1.197 Stroke: 1.085 RPM: 2,000-11,000 Output: 1.90 @ 11,000 Weight: 30.50 Recommended Props: 13x11-12, 14x10-11 Muffler: yes CART  ADD  Price $379.99* Prices with * Include Ground Freight (48 states).

Part No.	PHOTO	Description	CART	Price
SLI 4001		Muffler, Side Mount Pitts O.S. 120 4-stroke, Slimline	ADD	$69.95
SLI 4001S	PHOTO	Muffler, Side Mount Pitts with Smoke O.S. 120 4-stroke, Slimline	ADD	$94.95
SLI 4011	PHOTO	Muffler, Inverted Pitts O.S. 120 4-stroke, Slimline	ADD	$71.95
SLI 4011S		Muffler, Inverted Pitts with Smoke O.S. 120 4-stroke, Slimline	ADD	$94.95

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FS-120 Surpass III Engine w/ Pump

Tremendous 4- stroke power for high-demand applications

• New regulating style pump delivers better response and is more reliable
• Quieter than before, thanks to a larger muffler
• Rear ball bearing is greased internally and rubber-sealed on both sides
• The crankshaft, cam shaft and piston ring are plated to resist corrosion
• Features a reversible carb and black rocker cover
• PHOTO of back side of engine

Part No. OS MG0935 Displacement: 1.2 cu in (19.7 cc) Bore: 1.197 in (30.4mm) Stroke: 1.083 in (27.5 mm) RPM: 2,000-12,000 Output: 2.1 hp @ 12,000 rpm Weight: 35.3 oz (1000 g) Recommended Props: 14x9-11, 15x8-10, 16x6, 17x6, 18x6 Muffler: yes & pump CART  ADD  Price $419.99* Prices with * Include Ground Freight (48 states).

Part No.	PHOTO	Description	CART	Price
SLI 4001		Muffler, Side Mount Pitts O.S. 120 4-stroke, Slimline	ADD	$69.95
SLI 4001S	PHOTO	Muffler, Side Mount Pitts with Smoke O.S. 120 4-stroke, Slimline	ADD	$94.95
SLI 4011	PHOTO	Muffler, Inverted Pitts O.S. 120 4-stroke, Slimline	ADD	$71.95
SLI 4011S		Muffler, Inverted Pitts with Smoke O.S. 120 4-stroke, Slimline	ADD	$94.95

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FS-200U 4-Stroke Ringed Engine

The biggest Surpass™ yet!

The newest and largest in the Surpass line is a perfect power plant for any 1.50-1.80 size plane!

• Quieter, more realistic airplane sound.
• High torque offers the ability to swing big props with ease.
• Includes multi-directional muffler for mounting versatility

Part No. OS MG0980 Displacement: 1.98 cu in (32.4 cc) Bore: 1.50 in (38mm) Stroke: 1.13 in (28.6 mm) Weight: 1.83 lb (830 g) Muffler: yes CART  ADD  Price $449.99* Prices with * Include Ground Freight (48 states).

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