OS Engines has presented the new competition nitro engine OS Speed B21 ADAM DRAKE EDITION II realized with the collaboration of Adam Drake.
The engine has been updated with a new 16.4mm x 16.55mm crankshaft which improves the driving feeling making it more linear and powerful and a new carburetor compatible with 6.5mm and 7.0mm Venturi. Below the promotional video and the engine specifications.