O.S. Engines

O.S. Engines Category Image
Quality and performance has made O.S. the standard in RC engines for over 80 years.
Filter
Filter
Clear Filters
  • (1201)
  • (199)
  • (158)
  • (27)
  • (19)
  • (1)
  • (31)
  • (3)
  • (129)
  • (40)
  • (15)
  • (2)
  • (1)
  • (1)
  • (27)
  • (19)
  • (3)
  • (1)
  • (3)
  • (2)
  • (1)
25-48 of 1,605 Results
FSa-72II Airplane Engine with F-5030 Silencer FSa-72II Airplane Engine with F-5030 Silencer
3.6 out of 5 Customer Rating
FSa-72II Airplane Engine with F-5030 Silencer
$549.99
75AX ABL .75 Airplane Glow Engine with Muffler 75AX ABL .75 Airplane Glow Engine with Muffler
4 out of 5 Customer Rating
75AX ABL .75 Airplane Glow Engine with Muffler
$343.93
120AX Ringed 1.20 Airplane Glow Engine with Muffler 120AX Ringed 1.20 Airplane Glow Engine with Muffler
3.4 out of 5 Customer Rating
120AX Ringed 1.20 Airplane Glow Engine with Muffler
$381.12
Gasket Cover: 21XM V2 Outboard Marine Gasket Cover: 21XM V2 Outboard Marine
5 out of 5 Customer Rating
Gasket Cover: 21XM V2 Outboard Marine
$6.49
Flex Shaft: 21XM Flex Shaft: 21XM
4.4 out of 5 Customer Rating
Flex Shaft: 21XM
$8.09 Price reduced from $25.20 to
Clearance Sale! ⓘ
Steering Arm: 21XM Steering Arm: 21XM
4.7 out of 5 Customer Rating
Steering Arm: 21XM
$13.75
Cylinder & Piston Assembly: 21XZ-R Cylinder & Piston Assembly: 21XZ-R
4.1 out of 5 Customer Rating
Cylinder & Piston Assembly: 21XZ-R
$188.33
Rear Housing: 21XM Rear Housing: 21XM
4.7 out of 5 Customer Rating
Rear Housing: 21XM
$52.65
Idle Adj Valve; FS-90/120 Idle Adj Valve; FS-90/120
4.7 out of 5 Customer Rating
Idle Adj Valve; FS-90/120
$11.80
Throttle Link Assembly: 21XM Throttle Link Assembly: 21XM
3.3 out of 5 Customer Rating
Throttle Link Assembly: 21XM
$10.86
RP7 Turbo Glow Plug Cold On-Road RP7 Turbo Glow Plug Cold On-Road
5 out of 5 Customer Rating
RP7 Turbo Glow Plug Cold On-Road
$14.99
Drive Shaft Nut: 21XM Drive Shaft Nut: 21XM
4 out of 5 Customer Rating
Drive Shaft Nut: 21XM
$11.87
Outboard Unit Assembly: 21XM V2 Outboard Marine Outboard Unit Assembly: 21XM V2 Outboard Marine
5 out of 5 Customer Rating
Outboard Unit Assembly: 21XM V2 Outboard Marine
$270.99
Upper Arm: 21XM Upper Arm: 21XM
5 out of 5 Customer Rating
Upper Arm: 21XM
$22.24
Rotor Spring #4B #4D #4C Rotor Spring #4B #4D #4C
4.1 out of 5 Customer Rating
Rotor Spring #4B #4D #4C
$6.49
Screw Set CZ-MX (8) Screw Set CZ-MX (8)
4.7 out of 5 Customer Rating
Screw Set CZ-MX (8)
$7.46
Mount Plate: 21XM Mount Plate: 21XM
3.7 out of 5 Customer Rating
Mount Plate: 21XM
$22.24
Connecting Rod: RXB/R/M Connecting Rod: RXB/R/M
4.4 out of 5 Customer Rating
Connecting Rod: RXB/R/M
$26.24
Front Bearing: 21RZ-B Front Bearing: 21RZ-B
4.2 out of 5 Customer Rating
Front Bearing: 21RZ-B
$27.29
Front Bearing: 11PS Front Bearing: 11PS
3.1 out of 5 Customer Rating
Front Bearing: 11PS
$22.04
Carburetor Retainer: 30VG Carburetor Retainer: 30VG
5 out of 5 Customer Rating
Carburetor Retainer: 30VG
$13.78
Cylinder Rebuild Kit: O.S. SPEED R21 EURO Cylinder Rebuild Kit: O.S. SPEED R21 EURO
4.7 out of 5 Customer Rating
Cylinder Rebuild Kit: O.S. SPEED R21 EURO
$251.47
Flex Shaft Assembl:y 21XM Flex Shaft Assembl:y 21XM
5 out of 5 Customer Rating
Flex Shaft Assembl:y 21XM
$29.46
Muffler Assembly Screws #E-2050 (4) Muffler Assembly Screws #E-2050 (4)
4.4 out of 5 Customer Rating
Muffler Assembly Screws #E-2050 (4)
$7.49
Clear All

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.

Our policies are top notch:
Same Day Shipping
Free Shipping Over $99
Expert Product Support
Easy Returns
Sign up for Horizon Hobby Text Alerts!

Never miss out - text HOBBY to 44721Learn More

Shop
Support
Company Info
Legal
Copyright © Horizon Hobby, LLC