O.S. Engines

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Quality and performance has made O.S. the standard in RC engines for over 80 years.
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1,581-1,604 of 1,605 Results
Carburetor #70D: 120AX Carburetor #70D: 120AX
3.3 out of 5 Customer Rating
$30.62 Price reduced from $102.08 to
Clearance Sale!
Piston Pin: 75AX Piston Pin: 75AX
3.7 out of 5 Customer Rating
$3.57 Price reduced from $11.91 to
Clearance Sale!
Dust Cap Set, 10mm (3) Dust Cap Set, 10mm (3)
4.4 out of 5 Customer Rating
$2.96 Price reduced from $9.85 to
Clearance Sale!
Connecting Rod: 21XR-B Version II Connecting Rod: 21XR-B Version II
4.8 out of 5 Customer Rating
$8.87 Price reduced from $29.56 to
Clearance Sale!
Slide Valve 21M Slide Valve 21M
5 out of 5 Customer Rating
$9.77 Price reduced from $32.56 to
Clearance Sale!
Speed Hex Driver Replacement Tip 2.5 Speed Hex Driver Replacement Tip 2.5
3.6 out of 5 Customer Rating
$5.52 Price reduced from $18.39 to
Clearance Sale!
Cylinder Liner: 140RX Cylinder Liner: 140RX
5 out of 5 Customer Rating
$31.80 Price reduced from $106.01 to
Clearance Sale!
Air Funnel #60RA: FS81 Alpha Air Funnel #60RA: FS81 Alpha
5 out of 5 Customer Rating
$5.74 Price reduced from $19.14 to
Clearance Sale!
55HZ-R Conversion Set: 55HZ, 50SX 55HZ-R Conversion Set: 55HZ, 50SX
5 out of 5 Customer Rating
$81.31 Price reduced from $271.02 to
Clearance Sale!
Crankshaft: R2101 Speed Crankshaft: R2101 Speed
5 out of 5 Customer Rating
$59.79 Price reduced from $199.31 to
Clearance Sale!
Outer Cylinder Head: R2103 Speed Outer Cylinder Head: R2103 Speed
5 out of 5 Customer Rating
$30.71 Price reduced from $102.35 to
Clearance Sale!
Crankshaft Ball Bearing, Rear: Speed 21 V-Spec Crankshaft Ball Bearing, Rear: Speed 21 V-Spec
4.5 out of 5 Customer Rating
$35.93 Price reduced from $119.78 to
Clearance Sale!
Carburetor Body: 21J3 Carburetor Body: 21J3
3.7 out of 5 Customer Rating
$26.16 Price reduced from $87.19 to
Clearance Sale!
Cylinder & Piston: T2101 Speed Cylinder & Piston: T2101 Speed
5 out of 5 Customer Rating
$41.44 Price reduced from $138.14 to
Clearance Sale!
Intake Manifold: FS-62V Intake Manifold: FS-62V
3.3 out of 5 Customer Rating
$5.74 Price reduced from $19.14 to
Clearance Sale!
Piston Ring: FS-62V Piston Ring: FS-62V
4.7 out of 5 Customer Rating
$10.42 Price reduced from $34.76 to
Clearance Sale!
Carb Reducer 7.5mm, Blue Carb Reducer 7.5mm, Blue
5 out of 5 Customer Rating
$20.99
Crankcase: 12XZ Spec II Speed Crankcase: 12XZ Spec II Speed
4.1 out of 5 Customer Rating
$21.00 Price reduced from $69.99 to
Clearance Sale!
O.S. Built-Up Parts Set Cyl Piston OS Speed R21GT O.S. Built-Up Parts Set Cyl Piston OS Speed R21GT
3.3 out of 5 Customer Rating
$89.58 Price reduced from $298.61 to
Clearance Sale!
Inner Head: 12XZ Speed Inner Head: 12XZ Speed
5 out of 5 Customer Rating
$30.99
Piston Ring: 140RX Piston Ring: 140RX
5 out of 5 Customer Rating
$9.77 Price reduced from $32.56 to
Clearance Sale!
Air Funnel: 56FS Air Funnel: 56FS
4.4 out of 5 Customer Rating
$5.28 Price reduced from $17.08 to
Clearance Sale!
Cylinder Liner: GT33 Cylinder Liner: GT33
3.6 out of 5 Customer Rating
$23.48 Price reduced from $78.25 to
Clearance Sale!
Nozzle Assembly: FL-70 Nozzle Assembly: FL-70
3.6 out of 5 Customer Rating
$21.10