PRECISION AND POWER SAVINGS

Save Up To 50% Off!

CLEARANCE SALE

Save Big While Supplies Last

PRECISION AND POWER SAVINGS

Save Up To 50% Off!

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

1215

Up to $100

267

Up to $250

231

Up to $500

35

$500 or more

22

721-768 of 1771 Results

    PowerBoost Pipe: 105HZ

    PowerBoost Pipe: 105HZ

    $293.00
    Front Bearing: 61FX
    5(2)

    Front Bearing: 61FX

    $22.16
    Cam Follower: Sirius 7

    Cam Follower: Sirius 7

    $21.12
    Camshaft: FS-91 Surpass

    Camshaft: FS-91 Surpass

    $60.57
    Carburetor Rotor: #40D

    Carburetor Rotor: #40D

    $11.80
    Piston Pin: 56 FS

    Piston Pin: 56 FS

    $11.91
    55HZ-R Conversion Set: 55HZ, 50SX

    55HZ-R Conversion Set: 55HZ, 50SX

    $271.02
    Rear Adapter: 18CV-RX

    Rear Adapter: 18CV-RX

    $17.08
    Cylinder and Piston Assembly: O.S. Speed B2104

    Cylinder and Piston Assembly: O.S. Speed B2104

    $193.70
    Induction Silencer .12/.21: INS

    Induction Silencer .12/.21: INS

    $46.39
    Carburetor Body: 18TM

    Carburetor Body: 18TM

    $46.31
    Crankshaft: R2101 Speed

    Crankshaft: R2101 Speed

    $199.31
    Outer Cylinder Head: R2103 Speed

    Outer Cylinder Head: R2103 Speed

    $102.35
    Piston Pin: 25XZ

    Piston Pin: 25XZ

    $7.99
    Screw Set (8): 18TZ-TX
    4(1)

    Screw Set (8): 18TZ-TX

    $9.85
    Slide Valve 12F3: T1201 Speed

    Slide Valve 12F3: T1201 Speed

    $39.05
    Nipple: GGT10

    Nipple: GGT10

    $25.25
    Camshaft Bearing: F 40-120

    Camshaft Bearing: F 40-120

    $17.16
    Carburetor Body: #10H

    Carburetor Body: #10H

    $13.99
    Carburetor Body: 40L, 55HZ Hyper

    Carburetor Body: 40L, 55HZ Hyper

    $76.68
    Connecting Rod: 21VF/SE

    Connecting Rod: 21VF/SE

    $21.10
    Connecting Rod with Bearings: GT60

    Connecting Rod with Bearings: GT60

    $97.90
    Crankshaft: FT-120 160

    Crankshaft: FT-120 160

    $199.31
    Cylinder Head with Valve: FS-91-P

    Cylinder Head with Valve: FS-91-P

    $135.63
    Drive Washer: 65LA
    5(2)

    Drive Washer: 65LA

    $12.99
    Exhaust Gasket: 55HZ

    Exhaust Gasket: 55HZ

    $17.16
    Exhaust Pipe: 120-240

    Exhaust Pipe: 120-240

    $21.04
    Insulator, 60K

    Insulator, 60K

    $19.05
    Cylinder Head Gasket: 25AX

    Cylinder Head Gasket: 25AX

    $6.49
    Gasket Head: 46AXII

    Gasket Head: 46AXII

    $6.49
    Intake Manifold: GF30

    Intake Manifold: GF30

    $34.86
    Exhaust Gasket: GT33
    5(1)

    Exhaust Gasket: GT33

    $7.46
    Intake Pipe Left: FT-120 240

    Intake Pipe Left: FT-120 240

    $21.10
    Muffler Assembly Screw: 65AX

    Muffler Assembly Screw: 65AX

    $8.49
    Mixture Control Nozzle: 56 FS

    Mixture Control Nozzle: 56 FS

    $13.78
    Muffler Assembly Screw F-4050: FS-62V

    Muffler Assembly Screw F-4050: FS-62V

    $9.49
    Needle Assembly: #60K/C

    Needle Assembly: #60K/C

    $29.60
    Piston Ring: FS72 Alpha

    Piston Ring: FS72 Alpha

    $29.49
    Shaft Throttle WLA-2: GT55

    Shaft Throttle WLA-2: GT55

    $29.60
    Throttle Lever Assembly: GT15HZ

    Throttle Lever Assembly: GT15HZ

    $9.49
    Rocker Cover Retaining Screws: FS-200S

    Rocker Cover Retaining Screws: FS-200S

    $9.85
    Connector Set: OMA-38

    Connector Set: OMA-38

    $13.99
    Crankcase: 25FX

    Crankcase: 25FX

    $44.10
    Crankshaft: 70SZ-H

    Crankshaft: 70SZ-H

    $67.99
    Cylinder Head: 55AX
    5(1)

    Cylinder Head: 55AX

    $34.86
    Cylinder: GF40

    Cylinder: GF40

    $147.00
    Drive Shaft Fixing Screw: Sirius 7

    Drive Shaft Fixing Screw: Sirius 7

    $14.75
    Drive Washer: FS-62V

    Drive Washer: FS-62V

    $10.94

    14

    15

    16

    17

    18

    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