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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1,662-1,709 of 1,758 Results
Muffler Extension: #843 Muffler Extension: #843
4.8 out of 5 Customer Rating
Muffler Extension: #843
$11.72
Bearing Set: OMA-2810 OMA-2815 Bearing Set: OMA-2810 OMA-2815
5 out of 5 Customer Rating
Bearing Set: OMA-2810 OMA-2815
$6.29 Price reduced from $20.99 to
Clearance Sale! ⓘ
Piston: FS-62V Piston: FS-62V
4.7 out of 5 Customer Rating
Piston: FS-62V
$10.42 Price reduced from $34.76 to
Clearance Sale! ⓘ
Cylinder Liner: 120AX Cylinder Liner: 120AX
4.1 out of 5 Customer Rating
Cylinder Liner: 120AX
$29.90 Price reduced from $99.65 to
Clearance Sale! ⓘ
Exhaust Adapter: FS-120S Exhaust Adapter: FS-120S
5 out of 5 Customer Rating
Exhaust Adapter: FS-120S
$9.99
Carburetor 61R: FS81 Alpha Pump Carburetor 61R: FS81 Alpha Pump
4 out of 5 Customer Rating
Carburetor 61R: FS81 Alpha Pump
$42.58 Price reduced from $141.93 to
Clearance Sale! ⓘ
Carburetor Body: #40G Carburetor Body: #40G
4.8 out of 5 Customer Rating
Carburetor Body: #40G
$8.84 Price reduced from $29.49 to
Clearance Sale! ⓘ
Connecting Rod: 20-28 Connecting Rod: 20-28
4.8 out of 5 Customer Rating
Connecting Rod: 20-28
$5.72 Price reduced from $19.05 to
Clearance Sale! ⓘ
Spring Metering WLA-2: GT55 Spring Metering WLA-2: GT55
5 out of 5 Customer Rating
Spring Metering WLA-2: GT55
$5.99
Cover Plate: 37SZ-H Cover Plate: 37SZ-H
3.3 out of 5 Customer Rating
Cover Plate: 37SZ-H
$9.85
Piston: 120AX Piston: 120AX
3.9 out of 5 Customer Rating
Piston: 120AX
$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
Rocker Arm Support Assembly: FS-40-48S
$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
Main Shaft :3820-1200 .25
$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
Carburetor Reducer 9mm, Red: Speed 21 V-Spec
$21.10
Throttle Lever Screw #10212A Throttle Lever Screw #10212A
4.4 out of 5 Customer Rating
Throttle Lever Screw #10212A
$1.95 Price reduced from $6.49 to
Clearance Sale! ⓘ
Mount Screw Mount Screw
4.4 out of 5 Customer Rating
Mount Screw
$6.49
Rocker Arm Assembly: F61-300 Rocker Arm Assembly: F61-300
4 out of 5 Customer Rating
Rocker Arm Assembly: F61-300
$8.85 Price reduced from $29.49 to
Clearance Sale! ⓘ
Security Ring: 3805 3810 Security Ring: 3805 3810
5 out of 5 Customer Rating
Security Ring: 3805 3810
$5.99
Rotor Spring #9B Rotor Spring #9B
5 out of 5 Customer Rating
Rotor Spring #9B
$6.49
Rocker Cover: FF-240 320 Rocker Cover: FF-240 320
5 out of 5 Customer Rating
Rocker Cover: FF-240 320
$6.67 Price reduced from $22.24 to
Clearance Sale! ⓘ
Cylinder/Piston/Rod: B2101 Speed Cylinder/Piston/Rod: B2101 Speed
3.2 out of 5 Customer Rating
Cylinder/Piston/Rod: B2101 Speed
$72.89 Price reduced from $242.95 to
Clearance Sale! ⓘ
Heat Sink Head: 75AX Heat Sink Head: 75AX
4.1 out of 5 Customer Rating
Heat Sink Head: 75AX
$14.55 Price reduced from $48.51 to
Clearance Sale! ⓘ
Head Gasket: 10LA Head Gasket: 10LA
3.3 out of 5 Customer Rating
Head Gasket: 10LA
$6.49
Carburetor Reducer, 7.0mm: OS Speed B21 Pink Rhonda Drake Edition Carburetor Reducer, 7.0mm: OS Speed B21 Pink Rhonda Drake Edition
3.4 out of 5 Customer Rating
Carburetor Reducer, 7.0mm: OS Speed B21 Pink Rhonda Drake Edition
$22.11
Cover Plate: GF40 Cover Plate: GF40
5 out of 5 Customer Rating
Cover Plate: GF40
$10.08 Price reduced from $33.61 to
Clearance Sale! ⓘ
Connecting Rod: GF40 Connecting Rod: GF40
4.2 out of 5 Customer Rating
Connecting Rod: GF40
$21.12 Price reduced from $70.40 to
Clearance Sale! ⓘ
Carburetor Reducer 8mm, Blue Carburetor Reducer 8mm, Blue
4.2 out of 5 Customer Rating
Carburetor Reducer 8mm, Blue
$6.33 Price reduced from $21.10 to
Clearance Sale! ⓘ
Camshaft: GF40 Camshaft: GF40
5 out of 5 Customer Rating
Camshaft: GF40
$24.14 Price reduced from $80.47 to
Clearance Sale! ⓘ
Rocker Arm Assembly: FS-40-48S Rocker Arm Assembly: FS-40-48S
3.6 out of 5 Customer Rating
Rocker Arm Assembly: FS-40-48S
$7.58 Price reduced from $25.29 to
Clearance Sale! ⓘ
Piston Pin: GT22 Piston Pin: GT22
3.6 out of 5 Customer Rating
Piston Pin: GT22
$5.74 Price reduced from $19.14 to
Clearance Sale! ⓘ
Gasket Head: GF40 Gasket Head: GF40
5 out of 5 Customer Rating
Gasket Head: GF40
$4.45 Price reduced from $14.84 to
Clearance Sale! ⓘ
Crank Pin Stop Screw: GF40 Crank Pin Stop Screw: GF40
5 out of 5 Customer Rating
Crank Pin Stop Screw: GF40
$4.15 Price reduced from $13.83 to
Clearance Sale! ⓘ
Crankshaft: GT22 Crankshaft: GT22
4.4 out of 5 Customer Rating
Crankshaft: GT22
$37.67 Price reduced from $125.57 to
Clearance Sale! ⓘ
Cylinder Rebuild Kit: 21XZ-B Speed Spec III Cylinder Rebuild Kit: 21XZ-B Speed Spec III
4.7 out of 5 Customer Rating
Cylinder Rebuild Kit: 21XZ-B Speed Spec III
$66.47 Price reduced from $221.55 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
O.S. Crankshaft Speed B2103 Type S & Type R
$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
Ignition Module IG-04: GF40
$35.93 Price reduced from $119.78 to
Clearance Sale! ⓘ
Connecting Rod: GT22 Connecting Rod: GT22
5 out of 5 Customer Rating
Connecting Rod: GT22
$17.36 Price reduced from $57.87 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
Carburetor Reducer 9mm, Blue: 21VB (P) V-Spec
$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
Valve Spring Retainer: GF40
$4.15 Price reduced from $13.83 to
Clearance Sale! ⓘ
Pushrod Cover: GF40 Pushrod Cover: GF40
4.7 out of 5 Customer Rating
Pushrod Cover: GF40
$4.45 Price reduced from $14.84 to
Clearance Sale! ⓘ
Piston Ring: 160FX Piston Ring: 160FX
4.3 out of 5 Customer Rating
Piston Ring: 160FX
$32.56
Carburetor #70D: 120AX Carburetor #70D: 120AX
3.3 out of 5 Customer Rating
Carburetor #70D: 120AX
$30.62 Price reduced from $102.08 to
Clearance Sale! ⓘ
Piston Ring: GF40 Piston Ring: GF40
5 out of 5 Customer Rating
Piston Ring: GF40
$10.08 Price reduced from $33.61 to
Clearance Sale! ⓘ
Exhaust Valve: GF40 Exhaust Valve: GF40
4.8 out of 5 Customer Rating
Exhaust Valve: GF40
$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
Silencer Body: F6040, GF40
$26.22 Price reduced from $87.39 to
Clearance Sale! ⓘ
Carburetor Body: 61P, FS110 Alpha Pump Carburetor Body: 61P, FS110 Alpha Pump
5 out of 5 Customer Rating
Carburetor Body: 61P, FS110 Alpha Pump
$26.21 Price reduced from $87.39 to
Clearance Sale! ⓘ
Crankshaft: 21XZ-R Speed Crankshaft: 21XZ-R Speed
4 out of 5 Customer Rating
Crankshaft: 21XZ-R Speed
$194.99
Gasket Set: BGX 3500 Gasket Set: BGX 3500
5 out of 5 Customer Rating
Gasket Set: BGX 3500
$10.94
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