FATHER'S DAY GIFT GUIDE

Find the perfect RC gift for Dad!

WE BOUGHT BIG, YOU SAVE BIGGER

Save Up To $75!

CLEARANCE SALE

Save Big While Supplies Last

FATHER'S DAY GIFT GUIDE

Find the perfect RC gift for Dad!

WE BOUGHT BIG, YOU SAVE BIGGER

Save Up To $75!

CLEARANCE SALE

Save Big While Supplies Last

  • 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

481-576 of 1812 Results

    Intake Pipe AS-R: FT-120 160

    Intake Pipe AS-R: FT-120 160

    $22.30
    Rocker Arm Shaft: Sirius 7

    Rocker Arm Shaft: Sirius 7

    $9.44
    Valve Spring: 20-300

    Valve Spring: 20-300

    $6.49
    Crankshaft: 56 FS

    Crankshaft: 56 FS

    $60.65
    Cylinder Jacket: Sirius 7

    Cylinder Jacket: Sirius 7

    $97.71
    Carburetor Gasket: GT60

    Carburetor Gasket: GT60

    $10.94
    Master Connecting Rod Assembly: Sirius 7

    Master Connecting Rod Assembly: Sirius 7

    $87.29
    Piston: 91HZ

    Piston: 91HZ

    $91.99
    Rocker Arm Assembly: 120 300

    Rocker Arm Assembly: 120 300

    $32.56
    Bearing L-1050ZZ

    Bearing L-1050ZZ

    $17.99
    80 Degree Exhaust Header: 155FS-a

    80 Degree Exhaust Header: 155FS-a

    $48.43
    Gasket Head, .2 Aluminum: 21XZ-R

    Gasket Head, .2 Aluminum: 21XZ-R

    $6.49
    Mixture Control Screw #10M

    Mixture Control Screw #10M

    $11.80
    Carburetor Rotor: #2A

    Carburetor Rotor: #2A

    $11.72
    Metering Needle Assembly 21M2(B) Speed: R2101

    Metering Needle Assembly 21M2(B) Speed: R2101

    $19.14
    Needle 3 (21M)

    Needle 3 (21M)

    $15.99
    #10 A5 Glow Plug Cold Air
    5(1)

    #10 A5 Glow Plug Cold Air

    $13.99
    Prop Washer: 40-61
    5(2)

    Prop Washer: 40-61

    $6.49
    Muffler Mounting Screws #873 (2)
    5(3)

    Muffler Mounting Screws #873 (2)

    $6.49
    Front Bearing: 21XZ-B

    Front Bearing: 21XZ-B

    $30.44
    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
    Ignition Module IG-06: GT15

    Ignition Module IG-06: GT15

    $97.70
    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
    Standoff 5x25.4mm 1" (4): GT55

    Standoff 5x25.4mm 1" (4): GT55

    $36.85
    Prop Nut 1/4 20-61
    4(1)

    Prop Nut 1/4 20-61

    $6.49
    Prop Locknut :FS40- 48Surpass

    Prop Locknut :FS40- 48Surpass

    $17.08
    Exhaust Seal O-Ring (2)

    Exhaust Seal O-Ring (2)

    $13.78
    Hex Head Screw 4x40mm (10)

    Hex Head Screw 4x40mm (10)

    $11.80
    Cover Plate: 15LA
    4(1)

    Cover Plate: 15LA

    $10.86
    Venturi: 15FP S

    Venturi: 15FP S

    $9.85
    Valve Spring: FS-70 91SII

    Valve Spring: FS-70 91SII

    $6.49
    Prop Washer: 20-40

    Prop Washer: 20-40

    $6.49
    Ratchet Spring #7H #7D #2K
    5(3)

    Ratchet Spring #7H #7D #2K

    $6.49
    #8 Glow Plug Long Medium Air Car
    4.8(34)

    #8 Glow Plug Long Medium Air Car

    $11.99
    P3 Turbo Glow Plug V-Spec Ultra Hot Off-Road
    5(2)

    P3 Turbo Glow Plug V-Spec Ultra Hot Off-Road

    $14.99
    Carburetor 60PS: FS-95V
    5(1)

    Carburetor 60PS: FS-95V

    $119.97
    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
    O.S. Dust Cover 21E 21F 22D 22J

    O.S. Dust Cover 21E 21F 22D 22J

    $11.91
    Joint Spring T-2040

    Joint Spring T-2040

    $13.78
    Muffler Extension: 120AX

    Muffler Extension: 120AX

    $26.24
    Muffler Extension 35mm: E-402

    Muffler Extension 35mm: E-402

    $22.26
    Type F Glow Plug Medium: Four Stroke
    4.8(14)

    Type F Glow Plug Medium: Four Stroke

    $13.99
    P4 Turbo Plug Super Hot Off-Road

    P4 Turbo Plug Super Hot Off-Road

    $14.99
    Carburetor #10G: 15LA

    Carburetor #10G: 15LA

    $25.29
    Exhaust Gasket: 21RZ

    Exhaust Gasket: 21RZ

    $13.78
    Thrust Washer: BGX-3500
    5(1)

    Thrust Washer: BGX-3500

    $6.49
    Outer Head O.S. Speed B21 Adam Drake Edition 3

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

    $97.99
    Header Pipe Spring

    Header Pipe Spring

    $11.80
    Piston Ring: 91FX
    2.5(2)

    Piston Ring: 91FX

    $26.24
    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
    Motor Mount: 46, 55AX
    5(5)

    Motor Mount: 46, 55AX

    $34.86
    Carburetor: #11K Slide, 18TZ, 21TM
    5(4)

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

    $96.66
    Ignition Module IG-02: GT33

    Ignition Module IG-02: GT33

    $104.01
    Spinner Nut: 60-91

    Spinner Nut: 60-91

    $15.78
    Head Gasket: B2101 Speed

    Head Gasket: B2101 Speed

    $12.04
    Carburetor: FT160, FF320
    5(1)

    Carburetor: FT160, FF320

    $102.95
    O-Ring Needle: FS/FX/LA
    4.8(8)

    O-Ring Needle: FS/FX/LA

    $8.49
    Motor Mount: 65LA, 61-91FX, 75AX
    5(2)

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

    $40.12
    Dust Cover: #2BK
    5(2)

    Dust Cover: #2BK

    $10.86
    Gasket Set: 12TZ

    Gasket Set: 12TZ

    $10.94
    Needle Valve Assembly #10J #10M

    Needle Valve Assembly #10J #10M

    $26.24
    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
    O.S. Outer Head Speed B2103 Type R & Type S

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

    $102.47
    Outer Head: B2102 Speed

    Outer Head: B2102 Speed

    $102.52
    M2003SC 70mm Manifold, Top Speed, On-Road

    M2003SC 70mm Manifold, Top Speed, On-Road

    $67.39
    T-2060SC WN Tuned Pipe

    T-2060SC WN Tuned Pipe

    $152.41
    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
    M1006SC Manifold

    M1006SC Manifold

    $71.60
    RP8 Turbo Glow Plug, On-Road, Cold

    RP8 Turbo Glow Plug, On-Road, Cold

    $15.99

    4

    5

    6

    7

    8

    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