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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1,345-1,392 of 1,758 Results
Rear Bearing: 12TR Rear Bearing: 12TR
5 out of 5 Customer Rating
Rear Bearing: 12TR
$61.99
O.S. Pistion Pin: .12XZ O.S. Pistion Pin: .12XZ
4.8 out of 5 Customer Rating
O.S. Pistion Pin: .12XZ
$8.99
Crankshaft: 21XZ-B Speed Crankshaft: 21XZ-B Speed
5 out of 5 Customer Rating
Crankshaft: 21XZ-B Speed
$52.49 Price reduced from $174.99 to
Clearance Sale! ⓘ
Cylinder & Piston Assembly: 21TM Cylinder & Piston Assembly: 21TM
5 out of 5 Customer Rating
Cylinder & Piston Assembly: 21TM
$122.17
Inner Head: 12XZ Speed Spec 3 Inner Head: 12XZ Speed Spec 3
5 out of 5 Customer Rating
Inner Head: 12XZ Speed Spec 3
$9.59 Price reduced from $31.99 to
Clearance Sale! ⓘ
Exhaust Gasket: 21RZ Exhaust Gasket: 21RZ
4.4 out of 5 Customer Rating
Exhaust Gasket: 21RZ
$13.78
Mixture Control Valve #10A Mixture Control Valve #10A
3.6 out of 5 Customer Rating
Mixture Control Valve #10A
$13.67
O.S. Metering Needle Assembly 22D Speed B2103 O.S. Metering Needle Assembly 22D Speed B2103
3.4 out of 5 Customer Rating
O.S. Metering Needle Assembly 22D Speed B2103
$19.14
Metering Needle Assembly 22C(B): Speed B2102 Metering Needle Assembly 22C(B): Speed B2102
5 out of 5 Customer Rating
Metering Needle Assembly 22C(B): Speed B2102
$5.74 Price reduced from $19.14 to
Clearance Sale! ⓘ
Carburetor #21L: 25AX Carburetor #21L: 25AX
5 out of 5 Customer Rating
Carburetor #21L: 25AX
$29.34 Price reduced from $97.81 to
Clearance Sale! ⓘ
Carburetor 80T: Sirius 7 Carburetor 80T: Sirius 7
4.1 out of 5 Customer Rating
Carburetor 80T: Sirius 7
$52.52 Price reduced from $125.08 to
Clearance Sale! ⓘ
E4050 In-Cowl Muffler: 65AX E4050 In-Cowl Muffler: 65AX
5 out of 5 Customer Rating
E4050 In-Cowl Muffler: 65AX
$67.33
Camshaft Bearing: F 120-300 Camshaft Bearing: F 120-300
4.5 out of 5 Customer Rating
Camshaft Bearing: F 120-300
$22.37
Crankcase: GF30 Crankcase: GF30
5 out of 5 Customer Rating
Crankcase: GF30
$48.89 Price reduced from $162.95 to
Clearance Sale! ⓘ
Cylinder & Piston: 65AX Cylinder & Piston: 65AX
3.3 out of 5 Customer Rating
Cylinder & Piston: 65AX
$138.26
Cylinder Liner 91HZ-R Speed 3D Cylinder Liner 91HZ-R Speed 3D
3.3 out of 5 Customer Rating
Cylinder Liner 91HZ-R Speed 3D
$121.99
Piston/Sleeve/Rod set: O.S. SPEED R2106 Piston/Sleeve/Rod set: O.S. SPEED R2106
4.5 out of 5 Customer Rating
Piston/Sleeve/Rod set: O.S. SPEED R2106
$279.99
Heatsink Head 55HZ.HZ-R Heatsink Head 55HZ.HZ-R
4.7 out of 5 Customer Rating
Heatsink Head 55HZ.HZ-R
$138.99
Carburetor Body: #10H Carburetor Body: #10H
4.5 out of 5 Customer Rating
Carburetor Body: #10H
$13.99
Connecting Rod: 21VF/SE Connecting Rod: 21VF/SE
4.1 out of 5 Customer Rating
Connecting Rod: 21VF/SE
$21.10
Connecting Rod with Bearings: GT60 Connecting Rod with Bearings: GT60
3.7 out of 5 Customer Rating
Connecting Rod with Bearings: GT60
$97.90
Crankshaft: 105HZ Crankshaft: 105HZ
5 out of 5 Customer Rating
Crankshaft: 105HZ
$30.72 Price reduced from $102.41 to
Clearance Sale! ⓘ
Cylinder Head: FS-95V Cylinder Head: FS-95V
4.5 out of 5 Customer Rating
Cylinder Head: FS-95V
$29.31 Price reduced from $97.70 to
Clearance Sale! ⓘ
Exhaust Gasket: 55HZ Exhaust Gasket: 55HZ
3.7 out of 5 Customer Rating
Exhaust Gasket: 55HZ
$17.16
Exhaust Pipe: 120-240 Exhaust Pipe: 120-240
3.7 out of 5 Customer Rating
Exhaust Pipe: 120-240
$21.04
Exhaust Gasket: GT33 Exhaust Gasket: GT33
5 out of 5 Customer Rating
Exhaust Gasket: GT33
$7.46
Muffler Assembly Screw: 65AX Muffler Assembly Screw: 65AX
4.1 out of 5 Customer Rating
Muffler Assembly Screw: 65AX
$2.55 Price reduced from $8.49 to
Clearance Sale! ⓘ
O-Ring Needle: FS/FX/LA O-Ring Needle: FS/FX/LA
3.9 out of 5 Customer Rating
O-Ring Needle: FS/FX/LA
$8.49
Piston Ring: FS72 Alpha Piston Ring: FS72 Alpha
4.1 out of 5 Customer Rating
Piston Ring: FS72 Alpha
$8.85 Price reduced from $29.49 to
Clearance Sale! ⓘ
Cap Screws M3 5x20(10): FL-70 Cap Screws M3 5x20(10): FL-70
3.5 out of 5 Customer Rating
Cap Screws M3 5x20(10): FL-70
$9.85
Throttle Lever Assembly: GT15HZ Throttle Lever Assembly: GT15HZ
4.1 out of 5 Customer Rating
Throttle Lever Assembly: GT15HZ
$9.49
Rocker Cover Retaining Screws: FS-200S Rocker Cover Retaining Screws: FS-200S
5 out of 5 Customer Rating
Rocker Cover Retaining Screws: FS-200S
$9.85
Connector Set: OMA-38 Connector Set: OMA-38
5 out of 5 Customer Rating
Connector Set: OMA-38
$13.99
Cylinder Head: 55AX Cylinder Head: 55AX
3.7 out of 5 Customer Rating
Cylinder Head: 55AX
$34.86
Super Can Filter, Large Super Can Filter, Large
5 out of 5 Customer Rating
Super Can Filter, Large
$14.99
Intake Manifold Assembly: FT-120 and FT-160 Intake Manifold Assembly: FT-120 and FT-160
4.1 out of 5 Customer Rating
Intake Manifold Assembly: FT-120 and FT-160
$44.10
Mixture Control Valve #60C: 61FX Mixture Control Valve #60C: 61FX
4.1 out of 5 Customer Rating
Mixture Control Valve #60C: 61FX
$2.96 Price reduced from $9.85 to
Clearance Sale! ⓘ
Muffler Assembly: F-4050 FS-62V Muffler Assembly: F-4050 FS-62V
5 out of 5 Customer Rating
Muffler Assembly: F-4050 FS-62V
$52.73
Needle Inlet Valve WLA-2: GT55 Needle Inlet Valve WLA-2: GT55
5 out of 5 Customer Rating
Needle Inlet Valve WLA-2: GT55
$17.11
Needle Assembly: #86, #8H Needle Assembly: #86, #8H
4.1 out of 5 Customer Rating
Needle Assembly: #86, #8H
$22.04
Prop Washer: 20-40 Prop Washer: 20-40
5 out of 5 Customer Rating
Prop Washer: 20-40
$6.49
Pushrod: FS72 Alpha Pushrod: FS72 Alpha
4.5 out of 5 Customer Rating
Pushrod: FS72 Alpha
$2.96 Price reduced from $9.85 to
Clearance Sale! ⓘ
Regulator Seat: 61E-R Regulator Seat: 61E-R
4.1 out of 5 Customer Rating
Regulator Seat: 61E-R
$3.56 Price reduced from $11.87 to
Clearance Sale! ⓘ
Wave Washer: Sirius 7 Wave Washer: Sirius 7
5 out of 5 Customer Rating
Wave Washer: Sirius 7
$6.49
Main Shaft: 5010-810 Main Shaft: 5010-810
3.3 out of 5 Customer Rating
Main Shaft: 5010-810
$10.99
Self-Tapping Screw, 2X12 (10) Self-Tapping Screw, 2X12 (10)
3.7 out of 5 Customer Rating
Self-Tapping Screw, 2X12 (10)
$8.58
Carburetor: 61B-PII 91HZ-PSII Carburetor: 61B-PII 91HZ-PSII
5 out of 5 Customer Rating
Carburetor: 61B-PII 91HZ-PSII
$86.14 Price reduced from $226.99 to
Clearance Sale! ⓘ
Flex Pipe 240mm 1114A: FT-300 Flex Pipe 240mm 1114A: FT-300
5 out of 5 Customer Rating
Flex Pipe 240mm 1114A: FT-300
$48.32
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