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Shop Our Holiday Gift Guide

NEW & IN STOCK

Hot Releases Ready To Ship Out

HOLIDAY DELIVERY DEADLINES

Last chance! FedEx 2-Day & Overnight only. Learn More

O.S. Engines

O.S. Engines

Quality and performance has made O.S. the standard in RC engines for over 80 years.

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865-960 of 1605 Results

    Clearance Sale!

    Connecting Rod Bearing: GGT10

    $7.63$25.44

    Clearance Sale!

    Clearance Sale!

    Back Plate: Sirius 7

    $192.56$466.21

    Clearance Sale!

    Clearance Sale!

    Crankcase: GT15

    $37.51$125.03

    Clearance Sale!

    Crankpin Stop Screw: GT60

    $11.80

    Cylinder & Piston: 25FX

    $40.73

    Piston: 37SZ-H

    $32.56

    Cylinder Head: FS-91-P

    $81.94

    Clearance Sale!

    Cylinder Liner: GT55

    $44.33$118.99

    Clearance Sale!

    Exhaust Valve Assembly: FS-70 Ultimate

    $40.12

    Collector Ring: FR7 Sirius 7

    $346.62

    Gasket Set: FS-120 II

    $10.94

    Cover Gasket: FS-70 Ultimate

    $11.91

    Case Gasket: GT60

    $7.46

    Silencer Body: 200 Surpass

    $87.21

    Clearance Sale!

    Pan Head Screw 3x18mm (10)

    $3.57$11.91

    Clearance Sale!

    Pushrod Cover: FS-26 Surpass

    $8.49

    Piston Ring: 55HZ

    $26.24

    Throttle Link WLA-2: GT55

    $10.99

    Vavle Exhaust: FS-91 Surpass

    $34.86

    Clearance Sale!

    Stator Assembly: 3820-1200 .25

    $13.79$45.99

    Clearance Sale!

    Clearance Sale!

    Air Funnel: 56FS

    $5.28$17.08

    Clearance Sale!

    Carburetor 61D: 65AX

    $97.71

    Carburetor: GT15HZ

    $190.20

    Muffler Extension: #842

    $11.72

    Motor Mount: 65LA, 61-91FX, 75AX

    $40.12

    Piston Ring: 70SZ-H

    $26.24

    Clearance Sale!

    Radial Mount Standoffs: Sirius 7

    $2.80$9.44

    Clearance Sale!

    Powerboost Pipe: GT15HZ

    $281.62

    Cam Cover Screws: FS-70 Ultimate (2)

    $7.46

    Clearance Sale!

    Carburetor Rotor: #60M

    $10.49$34.99

    Clearance Sale!

    Carburetor Body: 70T, GF30

    $97.90

    70T Carburetor: GF30 Gasoline Engine

    $174.34

    Carburetor Retaining Screws: 2.6x18mm (10)

    $9.85

    Connecting Rod: 56 FS

    $22.04

    Connecting Rod: 12Z CV

    $17.01

    Connecting Rod: 91SX-H Complete

    $27.48

    Cover Plate Gasket: 75AX

    $6.49

    Pushrod Cover O-Ring: 56 FS

    $6.49

    Cover Plate: 120AX

    $17.16

    Crankcase: FS110A

    $119.86

    Clearance Sale!

    Crankcase: FS72 Alpha

    $29.79$87.39

    Clearance Sale!

    Cylinder & Piston Assembly: 75AX

    $138.19

    Cylinder Head: FS72 Alpha

    $76.70

    Drive Gear Screw: 240-300

    $6.49

    Clearance Sale!

    Drive Shaft Bearing: Sirius 7

    $7.30$24.36

    Clearance Sale!

    Drive Washer: 46AXII

    $13.83

    Drive Washer: FS72 Alpha

    $19.05

    Link Pin E-Ring: Sirius 7

    $6.49

    Gasket Set: 91FX

    $8.43

    Locknut Set: BGX 3500

    $26.24

    Needle Valve Assembly: 91SZ-H Hyper

    $29.60

    O-Ring Small #2K #2SB

    $6.49

    Pushrod Cover: FS155A-P

    $10.94

    Piston: FS-95V

    $48.43

    Piston: GGT10

    $52.58

    Piston Ring: 32FH

    $26.24

    Clearance Sale!

    Rotor Gear Screw: 30Wankel

    $4.15$13.83

    Clearance Sale!

    Screw Set (12): FS-40 Surpass

    $9.44

    Valve Assembly Exhaust: FS-52 Surpass

    $22.26

    Valve Collet: FS-120 Surpass

    $10.86

    Head Gasket: 21TM

    $9.74

    Cylinder Piston Rod Set: O.S. Speed B2104

    $242.95

    Clearance Sale!

    Cover Plate: O.S. Speed B2104

    $10.50$28.35

    Clearance Sale!

    Carburetor Retainer: 21EX-B, R

    $11.87

    Crankcase: 21XZ-B

    $124.99

    Cylinder Rebuild Kit: R2101 Speed

    $232.21

    Cylinder & Piston Speed: T1202

    $127.43

    Outer Head: 19XZ-B Speed

    $102.20

    Air Filter: INS

    $40.99

    Carb Reducer 5.5mm: #11H, #11HB, 12TZ

    $11.80

    Clearance Sale!

    Carburetor Body: 21J3

    $29.31$97.70

    Clearance Sale!

    Carburetor Rotor: #11J

    $29.60

    Connecting Rod: Speed B2101, B2102

    $52.58

    Crankcase: 21XZ-B Ver2

    $124.95

    Inner Head: 21XZ-B Spec 2

    $57.96

    Gasket Head Aluminum, .2mm: 19XZ-B Speed

    $5.31

    Thermo Insulator, 11K: 18TM

    $19.14

    Gasket Head, .1 Brass: 21XZ-R

    $6.49

    Clearance Sale!

    Slide Valve 21M

    $9.77$32.56

    Clearance Sale!

    Rear Adapter: 18TM

    $19.05

    Speed Flywheel Puller

    $48.34

    Cylinder Liner: FS155A-P

    $58.85

    Fuel Inlet Nipple: 12-240

    $6.49

    Under Cover: IL-300 Dia-Star

    $16.81

    Rocker Cover Gasket: GF40

    $10.94

    Head Gasket: 56 FS

    $6.49

    Ignition Module IG-02: GT33

    $104.01

    Exhaust Header Pipe Assembly F-5050: FS-95V

    $19.14

    Cover Plate: 200 Surpass

    $22.30

    Lever Metering WLA-2: GT55

    $11.87

    Nozzle: 15FP-S RN

    $9.85

    Pushrod Cover Assembly: 120Surpass

    $22.04

    Piston: 50SX-H

    $37.80

    Prop Nut 1/4 20-61

    $6.49

    Clearance Sale!

    Rocker Arm Assembly: 200 Surpass

    $11.05$36.85

    Clearance Sale!

    Screw Set (10): 46AX 55AX

    $10.86

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