O.S. Engines Speed B21 AD4 Adam Drake 4 Competition .21 Nitro Engine w/TB02 Pipe Broken In by Adam Drake

O.S. Engines would like to introduce the 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.

Comes with Adam's EBIS break in service and includes the TB02 pipe with 75mm header.

Specifications:
Displacement: 3.49 cc / 0.213 cu.in.
Bore: 16.4mm / 0.646 in.
Stroke: 16.55mm / 0.652 in.
Output: 2.65 ps / 2.61 hp / 34,000 r.p.m.
Operating RPM Range: 4,000-42,000 r.p.m.
Weight: 352g / 12.42 oz.

Standard Included Items:
Glow plug O.S. SPEED T-P3 1 piece
Reducers 6,8
Exhaust seal ring 1 piece
Dust cap 3, 16, 18 1 each