he O.S. Speed B21 Adam Drake 4 is the newest evolution in the legendary Adam Drake line of .21 competition buggy engines. Co-developed with multi-time ROAR Champion Adam Drake, this powerhouse delivers smoother throttle response, improved torque, enhanced cooling, and race-winning consistency straight out of the box.

Matched with the T-2090 tuned pipe, this combo provides exceptional low-to-mid-range punch and a clean, linear power curve—perfect for modern 1/8 nitro buggy tracks.

Key Features

What’s New

• Revised cylinder liner porting
  Updated port design generates stronger torque and improved overall efficiency.

• Updated crankshaft inner diameter
  Enhances low-to-mid power delivery for quicker acceleration out of corners.

• New lightweight outer cooling head

  • Extra cooling fin for improved heat dissipation

  • Reduced weight for better balance

  • Lower centre of gravity for improved chassis feel

  • Two-tone double-anodised finish with new laser-etched design

Additional Highlights

• Co-developed with OS team driver Adam Drake for maximum performance and reliability.

• New boost bypass crankcase machining improves smoothness and throttle feel.

• Signature Adam Drake blue anodised accents on the cooling head.

• Precision Japanese build quality for long-term durability and tuning consistency.

Product Information

What's in the Box

• (1) O.S. Speed B21 Adam Drake 4 .21 Buggy Engine

• (1) T-2090 Tuned Pipe