Speed B2102 .21 Low Profile Off-Road Nitro Engine (Turbo Plug) by O.S.

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Frederick, MD

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This product was added to our catalog on January 13, 2017.

This is the O.S. Speed B2102 .21 Off-Road Nitro Engine. The innovative B2102 engine comes equipped with a low profile head which provides great influence to the running performance. The low-profile cooling head (-17mm) makes the vehicles center-of-gravity much lower, which improves car handling drastically without sacrificing cooling performance.

The B2102 also comes equipped with the O.S. 22C (B) carburetor for improved fuel mileage to go the distance; ten-minute runs on a single tank are no longer a privilege of top drivers with magic fingers.


  • Low cylinder head reduces the buggy's center of gravity by 0.67"
  • (17mm) for better stability during aggressive driving
  • Redesigned 22C slide valve carburetor for better fuel economy
  • Tungsten weighted crankshaft with diamond-like coating and silicon potting
  • Bypass of crankcase is modified for better performance

Displacement: 0.211 cu (3.46 cc)
Bore: 0.646 in (16.40 mm)
Stroke: 0.646 in (16.40 mm)
Practical RPM: 4,000-42,000
Power Output: 2.65 PS/2.61 hp @ 34,000 rpm
Crankshaft Size: UNF1/4-28
Distance/Mounting Hole Centers Same Side: 0.83" (21mm)
Distance/Mounting Hole Centers Opposite Side: 1.45" (37mm)
Width of Crankcase below Mounting Tabs: 1.2" (31.6mm)
Width of Mounting Tabs: 1.8" (45mm)
Height/Mounting Tab to top of Cylinder Head: 2.6" (65.9mm)
Height/Mounting Tab to center of Exhaust Outlet: 1.1" (28mm)
Height Crankcase Bottom to top of Cylinder Head: 3.2" (81.5mm)
Length of Crankshaft end to Front Bearing: 1.2" (29.5mm)
Length of Crankshaft end to Backplate: 3.7" (94mm)
Length of Crankshaft end to Center of Crankcase: 2.9" (73.5mm)


  • O.S. Engines Speed B2102 Engine with P3 Turbo Glow Plug
  • 6.5mm Carburetor Reducer in Red
  • Exhaust Seal Ring
  • One each 3mm, 16mm and 18mm Dust Caps
  • Instruction Manual

Carburetor Settings: (Carburetor is preset from factory and should only require very small adjustments)
Needle Valve: 3 turns open from fully closed
Mixture Control Valve: One turn screwed in from flush position with carb body
Metering Needle: 0.3-0.4mm protruding from flush position with carb body
Throttle Stop Screw: Approximately 0.5mm from carb body when viewed from above