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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654-701 of 1,758 Results
Carburetor: #11KR Slide, 21TM-R Revo Carburetor: #11KR Slide, 21TM-R Revo
5 out of 5 Customer Rating
$92.46
High Pressure Check Valve: 91HZ-R High Pressure Check Valve: 91HZ-R
5 out of 5 Customer Rating
$21.10
Motor Mount: 15LA Motor Mount: 15LA
4.1 out of 5 Customer Rating
$22.26
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!
Header Pipe Spring Header Pipe Spring
3.7 out of 5 Customer Rating
$11.80
Pump Unit PD-08: FS-200S-P Pump Unit PD-08: FS-200S-P
5 out of 5 Customer Rating
$87.29
Piston Ring: 91FX Piston Ring: 91FX
4.4 out of 5 Customer Rating
$26.24
Piston: GF40 Piston: GF40
3.9 out of 5 Customer Rating
$20.48 Price reduced from $68.27 to
Clearance Sale!
Spinner Nut: 60-91 Spinner Nut: 60-91
5 out of 5 Customer Rating
$15.78
90 Degree Muffler Extension: 120AX 90 Degree Muffler Extension: 120AX
4.3 out of 5 Customer Rating
$34.86
O.S. Cylinder Piston Rod Set Speed B2103 Type R O.S. Cylinder Piston Rod Set Speed B2103 Type R
5 out of 5 Customer Rating
$72.89 Price reduced from $242.95 to
Clearance Sale!
Motor Mount: 140RX, FS120, 120AX, FS200S Motor Mount: 140RX, FS120, 120AX, FS200S
3.3 out of 5 Customer Rating
$77.99
Carburetor Reducer 7mm, Yellow: 21XZ-B Carburetor Reducer 7mm, Yellow: 21XZ-B
3.6 out of 5 Customer Rating
$3.54 Price reduced from $11.80 to
Clearance Sale!
Speed Exhaust Seal Ring (10): B21 Speed Exhaust Seal Ring (10): B21
5 out of 5 Customer Rating
$38.86
Outer Head: O.S. Speed B21 Pink Rhonda Drake Edition Outer Head: O.S. Speed B21 Pink Rhonda Drake Edition
4.6 out of 5 Customer Rating
$33.38 Price reduced from $111.25 to
Clearance Sale!
Cylinder Piston Rod Set: O.S. Speed B2104 Cylinder Piston Rod Set: O.S. Speed B2104
3.4 out of 5 Customer Rating
$242.95
Cylinder Liner: 91FX Cylinder Liner: 91FX
4.8 out of 5 Customer Rating
$26.68 Price reduced from $88.92 to
Clearance Sale!
Exhaust Seal O-Ring (2) Exhaust Seal O-Ring (2)
4.7 out of 5 Customer Rating
$13.78
Cylinder Piston Assembly: 21XZ-B Spec 2 Cylinder Piston Assembly: 21XZ-B Spec 2
4 out of 5 Customer Rating
$61.31 Price reduced from $204.38 to
Clearance Sale!
Intake Manifold: GF30 Intake Manifold: GF30
3.9 out of 5 Customer Rating
$10.46 Price reduced from $34.86 to
Clearance Sale!
Pushrod: GF40 Pushrod: GF40
5 out of 5 Customer Rating
$8.90 Price reduced from $29.68 to
Clearance Sale!
Outer Head: Speed 21XZ-B Spec III Outer Head: Speed 21XZ-B Spec III
5 out of 5 Customer Rating
$30.76 Price reduced from $102.52 to
Clearance Sale!
Camshaft Bearing: F 120-300 Camshaft Bearing: F 120-300
4.5 out of 5 Customer Rating
$22.37
Crankcase: GF30 Crankcase: GF30
5 out of 5 Customer Rating
$48.89 Price reduced from $162.95 to
Clearance Sale!
Cylinder & Piston: 65AX Cylinder & Piston: 65AX
3.3 out of 5 Customer Rating
$138.26
Exhaust Pipe Nut: F40-300 Exhaust Pipe Nut: F40-300
3.9 out of 5 Customer Rating
$6.49
Gasket Set: 46AX Gasket Set: 46AX
3.1 out of 5 Customer Rating
$11.80
Gasket Carb IP: #10, FR5 Gasket Carb IP: #10, FR5
4.5 out of 5 Customer Rating
$6.49
Cover Plate Gasket: 35AX Cover Plate Gasket: 35AX
3.7 out of 5 Customer Rating
$10.94
Piston Pin Retainer: 40PS Piston Pin Retainer: 40PS
5 out of 5 Customer Rating
$6.49
Piston Pin: 55HZ Hyper Piston Pin: 55HZ Hyper
4.7 out of 5 Customer Rating
$10.94
Prop Nut: 61-120 Prop Nut: 61-120
3.9 out of 5 Customer Rating
$6.49
Prop Washer 10-12 Prop Washer 10-12
5 out of 5 Customer Rating
$1.95 Price reduced from $6.49 to
Clearance Sale!
Main Shaft Stopper SET: OMA-50 Main Shaft Stopper SET: OMA-50
4.7 out of 5 Customer Rating
$7.99
Cover Plate: 15CV-A Cover Plate: 15CV-A
5 out of 5 Customer Rating
$10.99
Cover Plate: FS-200S-P Cover Plate: FS-200S-P
4.1 out of 5 Customer Rating
$25.44
Exhaust Pipe Nut: FS-120 III Exhaust Pipe Nut: FS-120 III
3.9 out of 5 Customer Rating
$6.49
Cylinder Head Gasket, .2mm: 91HZ Cylinder Head Gasket, .2mm: 91HZ
3.7 out of 5 Customer Rating
$7.46
Mixture Control Valve 80T: Sirius 7 Mixture Control Valve 80T: Sirius 7
3.3 out of 5 Customer Rating
$6.33 Price reduced from $21.12 to
Clearance Sale!
O-Ring Small: 120Surpass O-Ring Small: 120Surpass
3.9 out of 5 Customer Rating
$6.49
Piston Pin Retainer P: 40-46 Piston Pin Retainer P: 40-46
3.9 out of 5 Customer Rating
$6.49
Piston Ring: GT22 Piston Ring: GT22
3.3 out of 5 Customer Rating
$25.44
Reed Valve Assembly: GT33 Reed Valve Assembly: GT33
5 out of 5 Customer Rating
$26.99
Reduction Gear: FR5 Reduction Gear: FR5
5 out of 5 Customer Rating
$24.59 Price reduced from $81.96 to
Clearance Sale!
Rocker Arm Retainer: FS-20-240 Rocker Arm Retainer: FS-20-240
4.7 out of 5 Customer Rating
$6.49
Camshaft Cover Camshaft Cover
4.7 out of 5 Customer Rating
$11.80
Screw Set (8): 15LA Screw Set (8): 15LA
3.9 out of 5 Customer Rating
$8.46
Valve Throttle WLA-2: GT55 Valve Throttle WLA-2: GT55
4.1 out of 5 Customer Rating
$15.76