FATHER'S DAY SALE LAST DAY!

00d

:

01h

:

21m

:

31s

HAPPY FATHER'S DAY

Celebrating the everyday heroes we call Dad.

SEND AN E-GIFT CARD TODAY

The perfect gift. No shipping. No stress.

FATHER'S DAY SALE LAST DAY!

00d

:

01h

:

21m

:

31s

HAPPY FATHER'S DAY

Celebrating the everyday heroes we call Dad.

SEND AN E-GIFT CARD TODAY

The perfect gift. No shipping. No stress.

  • Cars & Trucks
  • Motorcycles
  • Aircraft
  • Boats
  • Radios
  • Batteries & Chargers
  • Parts
  • Part Finder
  • Learn & Enjoy
  • Sale
  1. Home
  2. Brands
  3. OS Engines

O.S. Engines

O.S. Engines

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

Filter

Less than $50

1238

Up to $100

270

Up to $250

241

Up to $500

36

$500 or more

26

769-864 of 1812 Results

    Outer Head: B2101 Speed

    Outer Head: B2101 Speed

    $108.03
    O.S. Cylinder Piston Rod Set Speed B2103 Type R

    O.S. Cylinder Piston Rod Set Speed B2103 Type R

    $242.95
    Standoff 5x50.8mm 2" (4): GT55

    Standoff 5x50.8mm 2" (4): GT55

    $48.51
    Carburetor Complete #61N: FS72 Alpha

    Carburetor Complete #61N: FS72 Alpha

    $102.96
    Locknut Set: FS-120 Surpass
    5(1)

    Locknut Set: FS-120 Surpass

    $26.24
    Silencer E-4040: GT15 75AX 95AX

    Silencer E-4040: GT15 75AX 95AX

    $51.64
    Needle #7M #7LFS
    5(1)

    Needle #7M #7LFS

    $13.78
    Prop Nut 1/4 20-61
    4(1)

    Prop Nut 1/4 20-61

    $6.49
    Piston Ring: 91FX
    2.5(2)

    Piston Ring: 91FX

    $26.24
    Exhaust Gasket: 21RZ

    Exhaust Gasket: 21RZ

    $13.78
    Hex Head Screw 4x40mm (10)

    Hex Head Screw 4x40mm (10)

    $11.80
    Valve Spring: FS-70 91SII

    Valve Spring: FS-70 91SII

    $6.49
    P4 Turbo Plug Super Hot Off-Road

    P4 Turbo Plug Super Hot Off-Road

    $14.99
    Front Bearing: 40-240
    5(2)

    Front Bearing: 40-240

    $21.17
    Joint Spring T-2040

    Joint Spring T-2040

    $13.78
    Header Pipe Spring

    Header Pipe Spring

    $11.80
    Spinner Nut: 60-91

    Spinner Nut: 60-91

    $15.78
    Thrust Washer: BGX-3500
    5(1)

    Thrust Washer: BGX-3500

    $6.49
    O-Ring Needle: FS/FX/LA
    4.8(8)

    O-Ring Needle: FS/FX/LA

    $8.49
    Carburetor: FT160, FF320
    5(1)

    Carburetor: FT160, FF320

    $102.95
    Type F Glow Plug Medium: Four Stroke
    4.8(14)

    Type F Glow Plug Medium: Four Stroke

    $13.99
    Ignition Module IG-02: GT33

    Ignition Module IG-02: GT33

    $104.01
    Outer Head O.S. Speed B21 Adam Drake Edition 3

    Outer Head O.S. Speed B21 Adam Drake Edition 3

    $97.99
    Muffler: E-2030, 20-25FP
    5(1)

    Muffler: E-2030, 20-25FP

    $26.24
    Motor Mount: 65LA, 61-91FX, 75AX
    5(2)

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

    $40.12
    Gasket Head, .2mm: 105HZ

    Gasket Head, .2mm: 105HZ

    $7.46
    Woodruff Key: 61-91
    5(3)

    Woodruff Key: 61-91

    $6.45
    Throttle Lever #1A-#3A
    5(4)

    Throttle Lever #1A-#3A

    $6.49
    Carburetor: #11K Slide, 18TZ, 21TM
    5(4)

    Carburetor: #11K Slide, 18TZ, 21TM

    $96.66
    Head Gasket: B2101 Speed

    Head Gasket: B2101 Speed

    $12.04
    Motor Mount: 46, 55AX
    5(5)

    Motor Mount: 46, 55AX

    $34.86
    Dust Cover: #2BK
    5(2)

    Dust Cover: #2BK

    $10.86
    Throttle Stop Screw 18TM

    Throttle Stop Screw 18TM

    $10.58
    Carburetor 21J4 (B) B21 Adam Drake II without Reducer

    Carburetor 21J4 (B) B21 Adam Drake II without Reducer

    $119.76
    M2002SC 80mm Manifold: 21XZ-B, 21VZ-B, 25XZ, 30VG

    M2002SC 80mm Manifold: 21XZ-B, 21VZ-B, 25XZ, 30VG

    $67.39
    T-2060SC WN Tuned Pipe Complete Set

    T-2060SC WN Tuned Pipe Complete Set

    $152.36
    Crankshft Ball Bearing, Rear: 12TZ Spec II

    Crankshft Ball Bearing, Rear: 12TZ Spec II

    $68.45
    Crankshaft: 18TM

    Crankshaft: 18TM

    $55.14
    Crankshaft: Speed B2102

    Crankshaft: Speed B2102

    $193.70
    Outer Head: B2102 Speed

    Outer Head: B2102 Speed

    $102.52
    O.S. Outer Head Speed B2103 Type R & Type S

    O.S. Outer Head Speed B2103 Type R & Type S

    $102.47
    M2003SC 70mm Manifold, Top Speed, On-Road

    M2003SC 70mm Manifold, Top Speed, On-Road

    $67.39
    Cylinder & Piston Assembly: 12TG

    Cylinder & Piston Assembly: 12TG

    $78.15
    Inner Head: 21XZ-B Speed

    Inner Head: 21XZ-B Speed

    $52.99
    Outer Head: R2101 Speed

    Outer Head: R2101 Speed

    $102.35
    Head Gasket: 28XZ

    Head Gasket: 28XZ

    $7.46
    Universal Nipple #12

    Universal Nipple #12

    $6.49
    Locknut Nozzle #2BK

    Locknut Nozzle #2BK

    $8.66
    Needle Holder 12F-B: 12XZ Speed Spec 3

    Needle Holder 12F-B: 12XZ Speed Spec 3

    $19.14
    Head Gasket: 0.1, 0.15, R2101 Speed

    Head Gasket: 0.1, 0.15, R2101 Speed

    $10.94
    Metering Needle Assembly 18TM

    Metering Needle Assembly 18TM

    $16.09
    Screw Set (8): 15CV-A
    4(1)

    Screw Set (8): 15CV-A

    $9.44
    Thermo Insulator 21J3

    Thermo Insulator 21J3

    $19.14
    Carburetor Reducer, 6.5mm: OS Speed B21 Pink Rhonda Drake Edition

    Carburetor Reducer, 6.5mm: OS Speed B21 Pink Rhonda Drake Edition

    $22.11
    Carburetor 21M2-B: Speed R2101

    Carburetor 21M2-B: Speed R2101

    $152.36
    Carburetor Body: #21C

    Carburetor Body: #21C

    $79.99
    Crankcase: R21

    Crankcase: R21

    $136.57
    Crankshaft: 28XZ

    Crankshaft: 28XZ

    $131.09
    Carburetor Reducer 8mm, Blue

    Carburetor Reducer 8mm, Blue

    $21.10
    RP8 Turbo Glow Plug, On-Road, Cold

    RP8 Turbo Glow Plug, On-Road, Cold

    $15.99
    Rear Bearing: 12TR

    Rear Bearing: 12TR

    $61.99
    O.S. Pistion Pin: .12XZ

    O.S. Pistion Pin: .12XZ

    $8.99
    Crankshaft: 21XZ-R

    Crankshaft: 21XZ-R

    $144.99
    S. Cylinder & Piston Assembly: 12XZ Speed Spec 3

    S. Cylinder & Piston Assembly: 12XZ Speed Spec 3

    $127.39
    Cylinder & Piston Assembly: 21TM

    Cylinder & Piston Assembly: 21TM

    $122.17
    Head Gasket: 30VG

    Head Gasket: 30VG

    $7.46
    O.S. Metering Needle Assembly 22D Speed B2103

    O.S. Metering Needle Assembly 22D Speed B2103

    $19.14
    Metering Needle Assembly 22C(B): Speed B2102

    Metering Needle Assembly 22C(B): Speed B2102

    $19.14
    Dust Cap Set, 7mm (3)

    Dust Cap Set, 7mm (3)

    $9.85
    Dust Cap Set, 10mm (3)

    Dust Cap Set, 10mm (3)

    $9.85
    Head Gasket: 21TM

    Head Gasket: 21TM

    $9.74
    Cylinder Piston Rod Set: O.S. Speed B2104

    Cylinder Piston Rod Set: O.S. Speed B2104

    $242.95
    Cover Plate: O.S. Speed B2104

    Cover Plate: O.S. Speed B2104

    $28.35
    Cylinder Rebuild Kit: R2101 Speed

    Cylinder Rebuild Kit: R2101 Speed

    $232.21
    Outer Head: 19XZ-B Speed

    Outer Head: 19XZ-B Speed

    $102.20
    Air Filter: INS

    Air Filter: INS

    $40.99
    Carb Reducer 5.5mm: #11H, #11HB, 12TZ

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

    $11.80
    Carburetor Body: 21J3

    Carburetor Body: 21J3

    $97.70
    Connecting Rod: 21XR-B Version II

    Connecting Rod: 21XR-B Version II

    $29.56
    O.S. Crankshaft Speed B2103 Type S & Type R

    O.S. Crankshaft Speed B2103 Type S & Type R

    $193.70
    Cylinder Piston Assembly: 21XZ-B Spec 2

    Cylinder Piston Assembly: 21XZ-B Spec 2

    $204.38
    Inner Head: 21XZ-B Spec 2

    Inner Head: 21XZ-B Spec 2

    $57.96
    Gasket Head Aluminum, .2mm: 19XZ-B Speed

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

    $5.31
    Thermo Insulator, 11K: 18TM

    Thermo Insulator, 11K: 18TM

    $19.14
    Gasket Head, .1 Brass: 21XZ-R

    Gasket Head, .1 Brass: 21XZ-R

    $6.49
    Rear Adapter: 18TM

    Rear Adapter: 18TM

    $19.05
    Slide Valve 21M

    Slide Valve 21M

    $32.56
    Speed Flywheel Puller

    Speed Flywheel Puller

    $48.34
    Speed Hex Driver Replacement Tip 2.5

    Speed Hex Driver Replacement Tip 2.5

    $18.39
    Carb Reducer 7.5mm, Blue

    Carb Reducer 7.5mm, Blue

    $20.99
    Carburetor 12F4-B: Speed T1202

    Carburetor 12F4-B: Speed T1202

    $125.13
    18TM Revo Manifold

    18TM Revo Manifold

    $52.77
    Cylinder & Piston Assembly: R2101 Speed

    Cylinder & Piston Assembly: R2101 Speed

    $177.63
    Inner Head: B2102 Speed

    Inner Head: B2102 Speed

    $52.69
    Needle Holder 21M: 21XZ-R

    Needle Holder 21M: 21XZ-R

    $16.09
    Metering Needle #11H #11HB

    Metering Needle #11H #11HB

    $16.09

    7

    8

    9

    10

    11

    HORIZON HOBBY, WHERE RC MEMORIES LIVE.

    Who We Are.

    At Horizon Hobby, our personal goal is to inspire dreams and build memories. We take pride in providing the best hobby store experience for our customers, whether that’s online, at RC events, or in the RC community with RC cars, RC planes, RC boats, and so much more.

    Our Values.

    Our purpose is simple: deliver WOW moments. By pursuing the best experience through our portfolio of RC cars, helicopters, airplanes, boats, and more, we bring the RC community together in every city, town, and country. We are radio control innovators and Driven is our middle name.

    Our Promise.

    Our promise to our customers is creating one-of-a-kind experiences that keeps you coming back for more. We are more than an online hobby store. Our RC cars and trucks, RC airplanes and helicopters, and other radio control products are with you at home, on the go, and with your friends. We bring the fun.

    Same Day ShippingFree Shipping Over $99Expert Product SupportEasy Returns

    Shop

    • New Releases
    • Our Brands
    • Spektrum Certified Used
    • Fan Gear
    • E-gift Card
    • Vehicle Finder
    • Shop Local
    • Find a Wishlist
    • Trains

    Support

    • Technical Product Support
    • RC Blog
    • Order Status
    • Repairs
    • Product Registration
    • Check E-Gift Card Balance
    • Shipping, Billing & Returns
    • Event Donations
    • Train Support
    • Know Before You Fly
    • Get Help

    Company Info

    • Our Story
    • Contact Us
    • Horizon Brands
    • RC Club
    • Horizon Hobby Visa Card
    • RC Events Calendar
    • Careers
    • Purchasing & Dealer Inquiries
    • Hobbies for Good
    • Affiliate Program

    Legal

    • Privacy Policy
    • Terms & Conditions
    • Site Map
    • Compliance
    • Patents
    • Product Recalls
    • Trademarks

    Sign up & save 10% on your next order!*

    Be the first to know about new products, deals, and events.

    *Some exclusions may apply. First time subscribers only. Your discount code will be emailed to you. By clicking sign up, you agree that you would like information, tips and offers about our events and products. See our privacy policy here.

    Sign up for Horizon Hobby Text Alerts!

    Never miss out - text HOBBY to 44721. Learn More

    Copyright 2025 © Horizon Hobby, LLC

    Our cookies

    This site uses cookies to enhance your web site experience. By continuing to browse or use this site, you are agreeing to our use of cookies. See our privacy policy here.

      Sign up & save 10% on your next order!*

      Be the first to know about new products, deals, and events.

      *Some exclusions may apply. First time subscribers only. Your discount code will be emailed to you. By clicking sign up, you agree that you would like information, tips and offers about our events and products. See our privacy policy here.

      Sign up for Horizon Hobby Text Alerts!

      Never miss out - text HOBBY to 44721. Learn More