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Buy a new O.S. engine between August 3, 2009 & December 31, 2009 and trade in an old engine, you'll receive up to $150 in Bonus Bucks as a reward. They come in the form of a merchandise certificate which you can use to buy products from many of R/C's most respected manufacturers.
For each O.S. engine purchased, provide the items below and mail to: O.S. Bonus Bucks, 1608 Interstate Dr., Champaign, IL 61826.
- A completed request form, Download the Form Here
- A dated retailer sales receipt
- A proof-of-purchase from your new engine
- Your trade-in engine
For Bonus Bucks Reward Amounts & Complete Rules Visit the Official OS Bonus Bucks Website
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 |
|
| Price |
$219.99*
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| 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 |
|
| Price |
$284.99*
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| 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 |
|
| Price |
$339.99*
|
| 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 |
|
| Price |
$369.99*
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| Prices with * Include Ground Freight (48 states). |
|
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| Part No. | PHOTO | Description | CART | Price |
| SLI 4012 |
|
Muffler, Inverted Pitts OS .91 4-stroke, Slimline |
|
$71.95
|
| SLI 4012S |
|
Muffler, Inverted Pitts with Smoke OS 91 4-stroke, Slimline |
|
$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 |
|
| 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 |
|
$71.95
|
| SLI 4012S |
|
Muffler, Inverted Pitts with Smoke OS 91 4-stroke, Slimline |
|
$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 |
|
| Price |
$399.99*
|
| 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 |
|
| Price |
$379.99*
|
| Prices with * Include Ground Freight (48 states). |
|
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| Part No. | PHOTO | Description | CART | Price |
| SLI 4001 |
|
Muffler, Side Mount Pitts O.S. 120 4-stroke, Slimline |
|
$69.95
|
| SLI 4001S |
|
Muffler, Side Mount Pitts with Smoke O.S. 120 4-stroke, Slimline |
|
$94.95
|
| SLI 4011 |
|
Muffler, Inverted Pitts O.S. 120 4-stroke, Slimline |
|
$71.95
|
| SLI 4011S |
|
Muffler, Inverted Pitts with Smoke O.S. 120 4-stroke, Slimline |
|
$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 |
|
| Price |
$419.99*
|
| Prices with * Include Ground Freight (48 states). |
|
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| Part No. | PHOTO | Description | CART | Price |
| SLI 4001 |
|
Muffler, Side Mount Pitts O.S. 120 4-stroke, Slimline |
|
$69.95
|
| SLI 4001S |
|
Muffler, Side Mount Pitts with Smoke O.S. 120 4-stroke, Slimline |
|
$94.95
|
| SLI 4011 |
|
Muffler, Inverted Pitts O.S. 120 4-stroke, Slimline |
|
$71.95
|
| SLI 4011S |
|
Muffler, Inverted Pitts with Smoke O.S. 120 4-stroke, Slimline |
|
$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 |
|
| Price |
$449.99*
|
| Prices with * Include Ground Freight (48 states). |
|
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