07/13/2026
O.S. SPEED B21 ADAM DRAKE 4. (AD4) Latest collaboration engine with world famous O.S. Team driver Adam Drake. Cylinder liner, crankshaft, outer head has been redesigned to Adam Drake’s spec for better balance, more torque and more power for better driving performance.
Newly designed cylinder liner uses 3 port design. Changing the exhaust dimension for more torque. Changed crankshaft’s inner diameter for better response in low to middle range.
New outer head has double anodized black and blue with new laser design and at same time lighter and better balance compared to the previous model. Inner head’s combustion chamber has been redesigned combustion efficiency has been improved, resulting in more torque. Comes with 6.0 and 8.0 blue anodized reducers
The AD4 comes with two different carburetor restrictors, 6.0mm for Buggy and 8.0mm for Truggy.
You can purchase the AD4 as engine only or the AD4 engine combo set. It’s an excellent choice for both buggy and truggy.
Available with and without Break-in service (EBIS) through www.thedrakeracing.com and selected retailers.
For more information and pricing. Please visit:
https://thedrakeracing.com/product-category/engines-and-pipes/
