O.S. Speed 1FH01 Adam Drake 4 (AD4) Engine/75mm Header/TB02-2090SC Pipe Combo Set with "Drake In"

O.S. Engines would like to introduce new O.S. SPEED B21 ADAM DRAKE 4. 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