OS Speed .21 RD2 Engine inc EBIS

OS Speed .21 RD2 Engine inc EBIS

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OS Speed .21 RD2 Engine inc EBIS

The O.S. Speed B21 Ronda Drake edition engine features a new Pink Cooling head and pink carburetor restrictors which are unique to complement her signature colors and style. Ronda Drake is the wife of Adam Drake and has over 30 years of remote control racing experience herself.  It’s an excellent choice for both buggy and truck racing as it provides a linear power band, exceptional fuel mileage and tons of overall power.

Featuring a unique semi-long stroke configuration, this engine also boasts a DLC crankshaft with larger double tungsten counterweights and a unique cylinder design that’s exclusive to the Drake edition engines.  These changes will provide smoother low end power and more overall torque.

The B21 Ronda Drake Edition is based off the B21AD (Same Specs as the AD2) and features a new Pink cooling head, head button with an o-ring to reduce vibration and keep dirt out, new carburetor ball, and different size Pink venturi.


      • Ronda Drake’s unique engine specs not used on any other O.S. Speed engine because it’s Pink.
      • Great for buggy and truck racing.
      • Redesigned cylinder liner with optimized porting.
      •  DLC crankshaft with larger double tungsten counterweight.
      • Semi-long stroke configuration.
      • Pink anodized 6.5 and 7.0 mm carburetor reducers.
      • Ceramic rear bearing.
      • 21J carburetor.
      • O.S.SPEED P3 gold plug, great for medium and low speed torque performance, is also included


      • Displacement: 0.213 cu in (3.49cc)
      • Bore: 0.646″ (16.4mm)
      • Stroke: 0.652″ (16.55mm)
      • Practical RPM: 4,000-42,000 RPM
      • Output: 2.65PS 34,000 RPM, 2.61HP @ 34,000RPM
      • Weight: 12.45oz (353g)

Engine  Includes:

      • (1)  B21 Ronda Drake Pink Edition Engine
      • (1) Engine to Header Gasket
      • (1) P3 Gold plug
      • (1) 21J carburetor
      • Pink anodized 6.5 and 7.0 mm carburetor reducers

RD Carburetor Settings

    • High Speed Needle: 1.35mm – 1.5mm in from flush.
    • Low Speed Needle: 0.45mm – 0.6mm in from flush.
    • Mid Speed Needle: flush to 0.15mm in from flush.