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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1,681-1,728 of 1,758 Results
Dust Cap Set, 18mm (3) Dust Cap Set, 18mm (3)
3.2 out of 5 Customer Rating
$3.57 Price reduced from $11.91 to
Clearance Sale!
Cylinder/Piston/Rod: B2101 Speed Cylinder/Piston/Rod: B2101 Speed
3.2 out of 5 Customer Rating
$72.89 Price reduced from $242.95 to
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Heat Sink Head: 75AX Heat Sink Head: 75AX
4.1 out of 5 Customer Rating
$14.55 Price reduced from $48.51 to
Clearance Sale!
Cover Plate: 37SZ-H Cover Plate: 37SZ-H
3.3 out of 5 Customer Rating
$9.85
Piston: 120AX Piston: 120AX
3.9 out of 5 Customer Rating
$17.33 Price reduced from $57.78 to
Clearance Sale!
Rocker Arm Support Assembly: FS-40-48S Rocker Arm Support Assembly: FS-40-48S
3.7 out of 5 Customer Rating
$3.52 Price reduced from $11.72 to
Clearance Sale!
Main Shaft :3820-1200 .25 Main Shaft :3820-1200 .25
5 out of 5 Customer Rating
$8.99
Carburetor Reducer 9mm, Red: Speed 21 V-Spec Carburetor Reducer 9mm, Red: Speed 21 V-Spec
4.1 out of 5 Customer Rating
$21.10
Throttle Lever Screw #10212A Throttle Lever Screw #10212A
4.4 out of 5 Customer Rating
$1.95 Price reduced from $6.49 to
Clearance Sale!
Rotor Spring #9B Rotor Spring #9B
5 out of 5 Customer Rating
$6.49
Carburetor Reducer, 7.0mm: OS Speed B21 Pink Rhonda Drake Edition Carburetor Reducer, 7.0mm: OS Speed B21 Pink Rhonda Drake Edition
Cover Plate: GF40 Cover Plate: GF40
5 out of 5 Customer Rating
$10.08 Price reduced from $33.61 to
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Connecting Rod: GF40 Connecting Rod: GF40
4.2 out of 5 Customer Rating
$21.12 Price reduced from $70.40 to
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Carburetor Reducer 8mm, Blue Carburetor Reducer 8mm, Blue
4.2 out of 5 Customer Rating
$6.33 Price reduced from $21.10 to
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Rocker Arm Assembly: FS-40-48S Rocker Arm Assembly: FS-40-48S
3.6 out of 5 Customer Rating
$7.58 Price reduced from $25.29 to
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Gasket Head: GF40 Gasket Head: GF40
5 out of 5 Customer Rating
$4.45 Price reduced from $14.84 to
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Crank Pin Stop Screw: GF40 Crank Pin Stop Screw: GF40
5 out of 5 Customer Rating
$4.15 Price reduced from $13.83 to
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Camshaft: GF40 Camshaft: GF40
5 out of 5 Customer Rating
$24.14 Price reduced from $80.47 to
Clearance Sale!
O.S. Crankshaft Speed B2103 Type S & Type R O.S. Crankshaft Speed B2103 Type S & Type R
4.8 out of 5 Customer Rating
$58.11 Price reduced from $193.70 to
Clearance Sale!
Ignition Module IG-04: GF40 Ignition Module IG-04: GF40
3.3 out of 5 Customer Rating
$35.93 Price reduced from $119.78 to
Clearance Sale!
Carburetor Reducer 9mm, Blue: 21VB (P) V-Spec Carburetor Reducer 9mm, Blue: 21VB (P) V-Spec
4.8 out of 5 Customer Rating
$3.54 Price reduced from $11.80 to
Clearance Sale!
Valve Spring Retainer: GF40 Valve Spring Retainer: GF40
4.1 out of 5 Customer Rating
$4.15 Price reduced from $13.83 to
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Piston Ring: 160FX Piston Ring: 160FX
4.3 out of 5 Customer Rating
$32.56
Pushrod Cover: GF40 Pushrod Cover: GF40
4.7 out of 5 Customer Rating
$4.45 Price reduced from $14.84 to
Clearance Sale!
Carburetor #70D: 120AX Carburetor #70D: 120AX
3.3 out of 5 Customer Rating
$30.62 Price reduced from $102.08 to
Clearance Sale!
Piston Ring: GF40 Piston Ring: GF40
5 out of 5 Customer Rating
$10.08 Price reduced from $33.61 to
Clearance Sale!
Exhaust Valve: GF40 Exhaust Valve: GF40
4.8 out of 5 Customer Rating
$13.23 Price reduced from $44.10 to
Clearance Sale!
Silencer Body: F6040, GF40 Silencer Body: F6040, GF40
3.6 out of 5 Customer Rating
$26.22 Price reduced from $87.39 to
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Carburetor Body: 61P, FS110 Alpha Pump Carburetor Body: 61P, FS110 Alpha Pump
5 out of 5 Customer Rating
$26.21 Price reduced from $87.39 to
Clearance Sale!
Crankshaft: 21XZ-R Speed Crankshaft: 21XZ-R Speed
4 out of 5 Customer Rating
$194.99
Gasket Set: BGX 3500 Gasket Set: BGX 3500
5 out of 5 Customer Rating
$10.94
Rocker Cover: GF40 Rocker Cover: GF40
3.9 out of 5 Customer Rating
$6.35 Price reduced from $21.17 to
Clearance Sale!
Carburetor Reducer 6.5mm, Blue Aluminum Carburetor Reducer 6.5mm, Blue Aluminum
3.1 out of 5 Customer Rating
$6.33 Price reduced from $21.10 to
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Muffler Power Box: 120AX Muffler Power Box: 120AX
5 out of 5 Customer Rating
$21.46 Price reduced from $71.53 to
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Pilot Shaft: GT60 Pilot Shaft: GT60
5 out of 5 Customer Rating
$5.97 Price reduced from $19.90 to
Clearance Sale!
Throttle Lever #2CBD #2H Throttle Lever #2CBD #2H
4 out of 5 Customer Rating
$1.95 Price reduced from $6.49 to
Clearance Sale!
Connecting Rod: 35AX Connecting Rod: 35AX
3.6 out of 5 Customer Rating
$6.61 Price reduced from $22.04 to
Clearance Sale!
Piston Ring: FS-95V Piston Ring: FS-95V
5 out of 5 Customer Rating
$10.42 Price reduced from $34.76 to
Clearance Sale!
Crankshaft: 21VZ-R Crankshaft: 21VZ-R
4 out of 5 Customer Rating
$109.99
Cover Plate: 21XZ-B Speed Cover Plate: 21XZ-B Speed
5 out of 5 Customer Rating
$7.63 Price reduced from $25.44 to
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O-Ring Rubber Gasket: 120AX O-Ring Rubber Gasket: 120AX
5 out of 5 Customer Rating
$3.28 Price reduced from $10.94 to
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Built-Up Parts Set (C&P) O.S. Speed T1204 Built-Up Parts Set (C&P) O.S. Speed T1204
5 out of 5 Customer Rating
$51.38 Price reduced from $171.28 to
Clearance Sale!
Start Shaft: 18CV-RX Start Shaft: 18CV-RX
4.7 out of 5 Customer Rating
$19.14
Cylinder & Piston Set: O.S. Max .12 TG Version 4 Cylinder & Piston Set: O.S. Max .12 TG Version 4
5 out of 5 Customer Rating
$23.44 Price reduced from $78.13 to
Clearance Sale!
Cylinder Piston Rod Rebuild Kit: R2103 Speed Cylinder Piston Rod Rebuild Kit: R2103 Speed
5 out of 5 Customer Rating
$76.08 Price reduced from $253.61 to
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Screw Idle Speed WLA-2: GT55 Screw Idle Speed WLA-2: GT55
3.4 out of 5 Customer Rating
$7.19 Price reduced from $23.99 to
Clearance Sale!
Carburetor #21K: 35AX Carburetor #21K: 35AX
4.5 out of 5 Customer Rating
$87.29
Crankshaft: 25FX Crankshaft: 25FX
5 out of 5 Customer Rating
$11.61 Price reduced from $38.71 to
Clearance Sale!