See: O.S. Engines

O.S. have introduced the new Speed B21 Adam Drake Edition nitro engine. This special Speed B21 engine that’s packed with upgrades from champion Adam Drake. It’s a terri c choice for trucks and buggies that delivers competition-caliber performance for demanding drivers. Featuring a semi-long stroke, this engine also boasts a DLC crankshaft with double tungsten counterweight and a redesigned cylinder lining with updated porting.

“O.S. is passionate about winning and is the proven choice of champions. Working with the engineers at O.S. to develop the New B21 Adam Drake engine was amazing. Our goal was to provide customers with a con guration that is exclusive to O.S. and provides the power, run-time, and drivability to be used with both buggies and truggies. If you’re looking for the ultimate off-road engine, the O.S. Speed B21 Adam Drake is the engine for you!” – Adam Drake


  • Designed and tested to Adam Drake’s race-winning specifications.
  • Great for buggies and trucks.
  • Redesigned cylinder liner with Drake-specified porting.
  • Newly designed DLC crankshaft with double tungsten counterweight.
  • New semi-long stroke design offers the perfect blend of torque and high-end performance.
  • 6.5 and 8.0 mm carburetor reducers.
  • Ceramic rear bearing.
  • Easy-to-tune 21J carburetor.
  • Speed Gold P3 Turbo glow plug.


  • Displacement: 0.213 cu in (3.49 cc)
  • Bore: 0.646 in (16.40 mm)
  • Stroke: 0.652 in (16.55 mm)
  • Practical Rpm: 4,000-42,000
  • Power Output: 2.61 hp @ 34,000 rpm
  • Weight: 12.45 oz (353 g)
  • Includes: 6.5 mm and 8.0 mm carb reducers, 21J carburetor and Speed Gold P3 Turbo glow plug
  • Requires: Glow fuel, glow igniter, fuel lter, fuel bottle, starter and T-2090SC Tuned Pipe Set (OSMG2953)