O.S. Engines would like to introduce new O.S.SPEED B21 ADAM DRAKE 4. The 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.
OS Engines O.S. Speed B21 Adam Drake Edition 4 3.49cc Nitro Engine Features
- Advice and testing was done by Roar Champion Adam Drake.
- 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 φ6II and φ8 blue anodized reducers.
In The Box
- (1) O.S. Speed B21 Adam Drake Edition 4 3.49cc Nitro Engine
- (1) O.S. SPEED P3 Glow Plug
- (1) Reducer Set (6II & 8mm)
- (1) Exhaust Seal Ring
- (1) Dust Cap Set (3mm, 16mm & 18mm)
This product was added on 08/17/2026.
