O.S. Engine

O.S. Engine

Start shopping the wide selection of O.S. Engine parts, accessories, and engines available at A Main Hobbies. We carry an assortment of O.S. Engine products to choose from for airplanes, helicopters, cars and trucks. Our selection include two and four stroke engines, bearings, screws, bolts and more!

Featured O.S. Products
O.S. Speed 21XZ-B Spec II Complete Piston/Sleeve/Rod Assembly
O.S. Speed 21XZ-B Spec II Complete Piston/Sleeve/Rod Assembly
$259.99
$219.99
O.S. Speed 21XZ-B Spec II "Tuned" Off-Road Competition Buggy Engine
O.S. Speed 21XZ-B Spec II "Tuned" Off-Road Competition Buggy Engine
$849.99
$449.97
O.S. Complete Piston/Sleeve/Rod Assembly (Speed .21)
O.S. Complete Piston/Sleeve/Rod Assembly (Speed .21)
$209.99
$179.99
O.S. Max .46AXII ABL Airplane Engine w/Muffler
O.S. Max .46AXII ABL Airplane Engine w/Muffler
$249.99
$149.97
O.S. Cylinder & Piston (Speed .21)
O.S. Cylinder & Piston (Speed .21)
$174.99
$149.99
O.S. .18 TZ (P) Turbo With 11K Slide Carburetor
O.S. .18 TZ (P) Turbo With 11K Slide Carburetor
$299.99
$174.99
Browse O.S. Products
(Click here to view ALL products)
Radio Control » Fuel & Accessories » Fuel Filters
Radio Control » Fuel & Accessories » Fuel Filters
Radio Control » Hardware & Fasteners » Ball Bearings
Radio Control » Hardware & Fasteners » Ball Bearings
Radio Control » Hardware & Fasteners » Screws, Bolts & Washers
Radio Control » Hardware & Fasteners » Screws, Bolts & Washers
Radio Control » RC Airplanes » Electric Motors & ESC's » ESC Parts & Accessories
Radio Control » RC Airplanes » Electric Motors & ESC's » ESC Parts & Accessories
Radio Control » RC Airplanes » Electric Motors & ESC's » Electric Motors
Radio Control » RC Airplanes » Electric Motors & ESC's » Electric Motors
Radio Control » RC Airplanes » Electric Motors & ESC's » Electronic Speed Controls
Radio Control » RC Airplanes » Electric Motors & ESC's » Electronic Speed Controls
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 10LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 10LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 120AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 120AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 15LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 15LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 160FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 160FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 25FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 25FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 25LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 25LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 35AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 35AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 46AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 46AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 46LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 46LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 55AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 55AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 61FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 61FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 65LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 65LA
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 75AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 75AX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 91FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » 91FX
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-110-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-110-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-120S-E
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-120S-E
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-120S-III
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-120S-III
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-30S
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-30S
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-56-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-56-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-81-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-81-A
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-91S-II
Radio Control » RC Airplanes » Engine Parts » O.S. Engines » FS-91S-II
Radio Control » RC Airplanes » Engines & Accessories » 2-Stroke Glow Engines
Radio Control » RC Airplanes » Engines & Accessories » 2-Stroke Glow Engines
Radio Control » RC Airplanes » Engines & Accessories » 4-Stroke Glow Engines
Radio Control » RC Airplanes » Engines & Accessories » 4-Stroke Glow Engines
Radio Control » RC Airplanes » Engines & Accessories » Engine Mounts
Radio Control » RC Airplanes » Engines & Accessories » Engine Mounts
Radio Control » RC Airplanes » Engines & Accessories » Engine Parts
Radio Control » RC Airplanes » Engines & Accessories » Engine Parts
Radio Control » RC Airplanes » Engines & Accessories » Gasoline Engines
Radio Control » RC Airplanes » Engines & Accessories » Gasoline Engines
Radio Control » RC Airplanes » Engines & Accessories » Glow Plugs
Radio Control » RC Airplanes » Engines & Accessories » Glow Plugs
Radio Control » RC Airplanes » Engines & Accessories » Manifolds
Radio Control » RC Airplanes » Engines & Accessories » Manifolds
Radio Control » RC Airplanes » Engines & Accessories » Tuned Mufflers
Radio Control » RC Airplanes » Engines & Accessories » Tuned Mufflers
Radio Control » RC Boats » Engines & Accessories » .21 Engines
Radio Control » RC Boats » Engines & Accessories » .21 Engines
Radio Control » RC Cars & Trucks » Engine Accessories » Air Filters » Filter Assemblies
Radio Control » RC Cars & Trucks » Engine Accessories » Air Filters » Filter Assemblies
Radio Control » RC Cars & Trucks » Engine Accessories » Cooling Heads
Radio Control » RC Cars & Trucks » Engine Accessories » Cooling Heads
Radio Control » RC Cars & Trucks » Engine Accessories » Engine Storage
Radio Control » RC Cars & Trucks » Engine Accessories » Engine Storage
Radio Control » RC Cars & Trucks » Engine Accessories » Glow Plugs » Standard
Radio Control » RC Cars & Trucks » Engine Accessories » Glow Plugs » Standard
Radio Control » RC Cars & Trucks » Engine Accessories » Glow Plugs » Turbo
Radio Control » RC Cars & Trucks » Engine Accessories » Glow Plugs » Turbo
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Accessories » Gaskets
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Accessories » Gaskets
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Manifolds » .12 - .18 » Off Road
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Manifolds » .12 - .18 » Off Road
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Manifolds » .21+ » Off Road
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipe Manifolds » .21+ » Off Road
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipes » .21+ » Off Road
Radio Control » RC Cars & Trucks » Engine Accessories » Tuned Pipes » .21+ » Off Road
Radio Control » RC Cars & Trucks » Engine Parts » Engine Bearings
Radio Control » RC Cars & Trucks » Engine Parts » Engine Bearings
Radio Control » RC Cars & Trucks » Engine Parts » JQ Products » THE Engine
Radio Control » RC Cars & Trucks » Engine Parts » JQ Products » THE Engine
Radio Control » RC Cars & Trucks » Engine Parts » Misc Brands
Radio Control » RC Cars & Trucks » Engine Parts » Misc Brands
Radio Control » RC Cars & Trucks » Engine Parts » Novarossi » .12 Engines
Radio Control » RC Cars & Trucks » Engine Parts » Novarossi » .12 Engines
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .12 TZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .12 TZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .18 TM
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .18 TM
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 Speed V-Spec
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 Speed V-Spec
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 TM
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 TM
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 VG
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 VG
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 VZ-B V-Spec
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 VZ-B V-Spec
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B Speed
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B Speed
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B Speed II
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B Speed II
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B V2 ABC VII
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-B V2 ABC VII
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-R
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .21 XZ-R
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .25 XZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .25 XZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .28 XZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .28 XZ
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .30 VG
Radio Control » RC Cars & Trucks » Engine Parts » O.S. Engines » .30 VG
Radio Control » RC Cars & Trucks » Engine Parts » Traxxas » TRX 2.5
Radio Control » RC Cars & Trucks » Engine Parts » Traxxas » TRX 2.5
Radio Control » RC Cars & Trucks » Engine Parts » Traxxas » TRX 3.3
Radio Control » RC Cars & Trucks » Engine Parts » Traxxas » TRX 3.3
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .12 (2.1cc) » On Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .12 (2.1cc) » On Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .18 (3.0cc)
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .18 (3.0cc)
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .21 (3.5cc) » Off Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .21 (3.5cc) » Off Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .21 (3.5cc) » On Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .21 (3.5cc) » On Road
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .28 (4.6cc)
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .28 (4.6cc)
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .30 (4.9cc)
Radio Control » RC Cars & Trucks » Engines » Nitro Engines » .30 (4.9cc)
Radio Control » RC Cars & Trucks » Parts » Traxxas » Revo
Radio Control » RC Cars & Trucks » Parts » Traxxas » Revo
Radio Control » RC Cars & Trucks » Parts » Traxxas » Slayer
Radio Control » RC Cars & Trucks » Parts » Traxxas » Slayer
Radio Control » RC Cars & Trucks » Parts » Traxxas » T-Maxx
Radio Control » RC Cars & Trucks » Parts » Traxxas » T-Maxx
Radio Control » RC Helicopters » Engine Parts » Misc Brands
Radio Control » RC Helicopters » Engine Parts » Misc Brands
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 105 HZ
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 105 HZ
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 105 HZ-R
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 105 HZ-R
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 50 SX-H Ring Hyper
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 50 SX-H Ring Hyper
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 55 HZ-H
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 55 HZ-H
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 HZ F3C
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 HZ F3C
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 HZ-PS 3D
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 HZ-PS 3D
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 SZ-H Ringed
Radio Control » RC Helicopters » Engine Parts » O.S. Engines » 91 SZ-H Ringed
Radio Control » RC Helicopters » Engines & Accessories » .30 to .60 Engines
Radio Control » RC Helicopters » Engines & Accessories » .30 to .60 Engines
Radio Control » RC Helicopters » Engines & Accessories » .90+ Engines
Radio Control » RC Helicopters » Engines & Accessories » .90+ Engines
Radio Control » RC Helicopters » Engines & Accessories » Exhaust Systems
Radio Control » RC Helicopters » Engines & Accessories » Exhaust Systems
Radio Control » RC Helicopters » Engines & Accessories » Glow Plugs
Radio Control » RC Helicopters » Engines & Accessories » Glow Plugs
Radio Control » RC Helicopters » Option Parts » Screws, Bolts & Washers
Radio Control » RC Helicopters » Option Parts » Screws, Bolts & Washers
Radio Control » Tools » Nitro Engine Tools » Piston & Crankshaft Locks
Radio Control » Tools » Nitro Engine Tools » Piston & Crankshaft Locks
Radio Control » Tools » Wrenches » Glow Plug Wrenches
Radio Control » Tools » Wrenches » Glow Plug Wrenches